Freight Class Calculator – LTL Class From Density
One number decides what your pallet costs to ship: its freight class. Measure the shipment, weigh it, and this calculator works out its density — pounds per cubic foot — then reads the class straight off the standard NMFC density scale, from dense class 50 freight down to feather-light class 500. It is an honest first pass, done properly: the same density maths carriers start from, with the class boundaries exactly where the published chart puts them.
Your shipment
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Your freight class
The maths, line by line
Right on the line
Exactly 6.00 lb/ft³ earns class 150 — every band on the scale starts at its stated density. But there is no slack here: at 239 lb in the same box the density slips to 5.97, and the class jumps to 175. Shipments that sit on a boundary deserve a careful reweigh before they are rated.
For this box: class 125 (one band denser) starts at 7.00 lb/ft³ — 280 lb · Class 175 (one band lighter) starts below 6.00 lb/ft³ — anything under 240 lb.
- One number decides what a pallet costs to ship — density in pounds per cubic foot, read straight off the standard NMFC density scale.
- Measure the shipment as it travels — outside of the packed piece, flaps, pallet and overhang included, because the carrier’s dimensioner sees the outermost points.
- Each band starts at its stated density — exactly 6.00 pounds per cubic foot counts as class 150, with nothing to spare.
Where your shipment lands on the scale
Eighteen classes, one sliding scale: the denser the freight, the lower the class and the cheaper the ride. The strip is spaced logarithmically so the crowded light end stays readable.
The marker sits exactly on the class 150 line — on this scale, a density of exactly 6.00 lb/ft³ is where class 150 begins, and every band works the same way: the stated density is included in its band.
An estimate with a job to do — not the final word
Density is the standard first pass, and for a great deal of LTL freight it is the whole story. But it is not the only story. The NMFC assigns many commodities an item-specific class, or rates them on density scales whose breaks are written into that item’s own entry — and stowability, handling and liability can move a shipment off its density band entirely. Carriers can also reweigh and remeasure your freight and bill what they find. So treat the class here as the number to plan and quote around, and let your NMFC item and your carrier have the final say — theirs is the class that governs the invoice.
Pairs well with this calculation
The measuring and converting that happens around a shipment.
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How to find your freight class in three steps
Measure the shipment as it travels
Length, width and height in inches, taken on the outside of the packed piece — box flaps, pallet and any overhang included, because the carrier’s dimensioner sees the outermost points, not the tidy ones. For matching pieces, measure one and count the rest in the pieces field.
Weigh everything, once
The total weight goes in as one number: freight, pallet, crating and all. A standard wood pallet alone adds roughly 30–50 lb, and leaving it out can drag a borderline shipment a full band lighter than it really is.
Read the band, then check the item
The class on the density scale is your planning number. Before the shipment moves, check the commodity’s NMFC item — many carry their own class or their own density breaks — and expect the carrier to verify both weight and dimensions at the dock.
How the freight class calculator works
cubic feet = L × W × H ÷ 1,728 · density = weight ÷ cubic feet · then read the band
The example on this page. A pallet measuring 48 × 40 × 36 inches holds 48 × 40 × 36 = 69,120 cubic inches, and 69,120 ÷ 1,728 = 40.00 cubic feet. At 240 lb, its density is 240 ÷ 40.00 = 6.00 lb/ft³. On the density scale, 6 to under 7 lb/ft³ is class 150 — and because each band starts at its stated density, exactly 6.00 counts, with nothing to spare: one pound less would make it class 175.
Pieces change nothing — when they are identical. Four matching crates of 48 × 40 × 36 inches, 960 lb in total: one crate is 40.00 ft³, four make 160.00 ft³, and 960 ÷ 160.00 = 6.00 lb/ft³ again — class 150. Rating matching pieces together cannot change their density, which is why this calculator asks for the total weight and the piece count separately.
The expensive corner: big and light. A 48 × 48 × 48 inch display crate at 100 lb takes up 64.00 ft³, so its density is 100 ÷ 64.00 = 1.56 lb/ft³, landing in the 1 to under 2 band — class 400. A trailer fills up with freight like this long before it weighs out, and the class is how the carrier charges for the space it actually consumed.
Why the class never uses a rounded density. The density is displayed rounded to two decimals, but the class is always read from the full, unrounded figure. A shipment at 5.9999 lb/ft³ displays as 6.00 — yet it is class 175, because it never actually reached 6. Rounding first would misclass it, so this calculator does not round first.
The full density scale
The classic NMFC density chart carriers and forwarders publish for density-based rating — every band, with the kind of freight that typically lands in it. Your current class is highlighted.
| Freight class | Density (lb per cubic foot) | Typical freight |
|---|---|---|
| 50 | 50 and up | Steel parts, nuts and bolts, dense castings |
| 55 | 35 to under 50 | Bricks, cement blocks, bagged aggregate |
| 60 | 30 to under 35 | Ceramic tile, heavy auto parts |
| 65 | 22.5 to under 30 | Books, printing paper, canned goods |
| 70 | 15 to under 22.5 | Boxed machinery, dry food goods, flat-pack furniture |
| 77.5 | 13.5 to under 15 | Tires, major appliances, packaged hand tools |
| 85 | 12 to under 13.5 | Cast iron cookware, bottled liquids |
| 92.5 | 10.5 to under 12 | Computers, boxed electronics |
| 100 | 9 to under 10.5 | Wine cases, assembled wooden furniture |
| 110 | 8 to under 9 | Framed mirrors, plastic kayaks |
| 125 | 7 to under 8 | Small appliances, lighting fixtures |
| 150 | 6 to under 7 | Assembled bicycles, luggage |
| 175 | 5 to under 6 | Upholstered furniture, large monitors |
| 200 | 4 to under 5 | Boxed clothing, mattresses |
| 250 | 3 to under 4 | Foam insulation, bamboo decor |
| 300 | 2 to under 3 | Model aircraft, empty plastic bottles |
| 400 | 1 to under 2 | Retail displays, deer antlers |
| 500 | Under 1 | Ping pong balls, loose feathers |
Going deeper
The chart on this page is the density scale carriers and forwarders have published for years for density-based rating: eighteen classes, with breaks running from 50 lb/ft³ at the dense end down to under 1 at the light end. It is the scale behind most online freight class calculators, and it is quoted in carrier guides from the major LTL networks.
In July 2025 the NMFTA — the body that maintains the NMFC — began moving density-rated commodities onto a standardised 13-sub scale with wider bands and no classes above 400; under that scale, classes such as 77.5, 110, 150, 200 and 500 are assigned by specific item instead of by density. Items are being migrated docket by docket, so both worlds currently coexist: some commodities already rate on the new ladder, many still rate on item rules that reference density breaks like the ones above. Either way, the check that settles a shipment is its NMFC item — in the NMFTA’s ClassIT+ tool or confirmed with the carrier — and this page’s estimate is the starting point for that conversation, not a substitute for it.
Classification formally weighs four characteristics. Density is the one you can compute on a tape measure and a scale. Stowability asks how the freight sits with other freight: an awkward, top-heavy or overhanging piece that nothing can be stacked on costs the trailer more than its own cube. Handling asks what it takes to move it: freight needing special equipment, extra labour or unusual care rates higher. Liability asks what it is worth and how claim-prone it is: high-value, theft-attractive or fragile goods carry risk a pallet of bricks never will.
Commodity items with strong handling, stowability or liability characteristics are often given a fixed class in the NMFC regardless of how dense they are — which is why two shipments with identical dimensions and weight can legitimately bill at different classes. When your freight is valuable, fragile or oddly shaped, expect the item rule, not the density band, to have the last word.
One box, four weights, three classes
The box never changes — 48 × 40 × 36 inches, 40.00 cubic feet — and only the weight moves, so each row isolates exactly what a pound is worth on the density scale. Every row was run through this page’s own calculator, on the classic 18-class NMFC density chart the page publishes.
| Total weight | Density | Freight class | What the row proves |
|---|---|---|---|
| 200 lb | 5.00 lb/ft³ | 175 | Exactly on the line where 175 begins. |
| 239 lb | 5.97 lb/ft³ | 175 | One pound short of the next class. |
| 240 lb (the default) | 6.00 lb/ft³ | 150 | Exactly on the line where 150 begins. |
| 280 lb | 7.00 lb/ft³ | 125 | Exactly on the line where 125 begins. |
The first lesson is that bands start at their stated density, with nothing to spare. At exactly 6.00 lb/ft³ the shipment earns class 150, not 175 — the band “6 to under 7” includes its own lower edge. At 5.97 lb/ft³ it is class 175, because it never actually reached 6. The second lesson is how little weight a class boundary is worth: one pound, from 239 to 240, moves the shipment a full class, from 175 to 150. That is why the pallet matters so much — a standard wood pallet alone adds roughly 30 to 50 lb, and leaving it out can drag a borderline shipment a full band lighter than it really is, in the expensive direction. Weigh everything, once: freight, pallet, crating and all, as the page’s own steps insist. And the third lesson is the rounding rule that protects the boundary: the density is displayed rounded to two decimals, but the class is always read from the full, unrounded figure. A shipment at 5.9999 lb/ft³ displays as 6.00 yet is class 175, because it never actually reached 6. Rounding first would misclass it, so this calculator does not round first — and neither should any spreadsheet you build on top of it.
The fourth lesson is about pieces, and it is the one shippers get backwards most often. Four matching crates of 48 × 40 × 36 inches, 960 lb in total, give the same class 150 as the single default box: one crate is 40.00 ft³, four make 160.00 ft³, and 960 ÷ 160.00 = 6.00 lb/ft³ again. Rating matching pieces together cannot change their density, which is why this calculator asks for the total weight and the piece count separately — the count scales the volume and the weight together, and the ratio survives. What the count does change is everything around the class: handling, the number of pieces the carrier must move, and the chance that one crate’s dimensions get re-measured at the dock. But the density itself is indifferent to how many identical pieces carry it.
The expensive corner: big and light
The other end of the scale is where the money hides. A 48 × 48 × 48 inch display crate at 100 lb takes up 64.00 ft³, so its density is 100 ÷ 64.00 = 1.56 lb/ft³, landing in the 1 to under 2 band — class 400 on the classic chart. A trailer fills up with freight like this long before it weighs out, and the class is how the carrier charges for the space the freight actually consumed. The dense end has the opposite character: at 50 lb/ft³ and up, class 50, the freight is steel parts, nuts and bolts and dense castings — a trailer weighs out long before it fills up, and the class rewards the shipper for freight that uses little space per pound. Between those poles the scale runs through every familiar kind of freight the page’s table lists: bricks and cement blocks at 55, books and canned goods at 65, boxed machinery at 70, computers and boxed electronics at 92.5, assembled bicycles and luggage at 150, boxed clothing and mattresses at 200, foam insulation at 250, and ping pong balls and loose feathers at 500, under 1 lb/ft³. The table is a map of the trailer: dense at one end, airy at the other, and the class is the price of the space you occupy on it.
The 2025 change: two scales, one check
The chart on this page is the classic 18-class density scale carriers and forwarders have published for years, and it is quoted in carrier guides from the major LTL networks. But it is no longer the only scale in play, and any honest guide written in October 2026 must say so. In July 2025 the NMFTA — the body that maintains the NMFC — began moving density-rated commodities onto a standardised 13-sub scale with wider bands and no classes above 400; under that scale, classes such as 77.5, 110, 150, 200 and 500 are assigned by specific item instead of by density. Items are being migrated docket by docket, so both worlds currently coexist: some commodities already rate on the new ladder, many still rate on item rules that reference density breaks like the ones above. What that means in practice is that this page’s class is a planning number on the classic scale, and the check that settles a shipment is its NMFC item — in the NMFTA’s ClassIT+ tool or confirmed with the carrier. If your commodity has already migrated, its item rule outranks the density band; if it has not, the density band is still the working answer. Either way, the page’s estimate is the starting point for that conversation, not a substitute for it.
Density is one factor of four
Classification formally weighs four characteristics, and density is only the one you can compute on a tape measure and a scale. Stowability asks how the freight sits with other freight: an awkward, top-heavy or overhanging piece that nothing can be stacked on costs the trailer more than its own cube. Handling asks what it takes to move it: freight needing special equipment, extra labour or unusual care rates higher. Liability asks what it is worth and how claim-prone it is: high-value, theft-attractive or fragile goods carry risk a pallet of bricks never will. Commodity items with strong handling, stowability or liability characteristics are often given a fixed class in the NMFC regardless of how dense they are — which is why two shipments with identical dimensions and weight can legitimately bill at different classes. When your freight is valuable, fragile or oddly shaped, expect the item rule, not the density band, to have the last word. Measure the box honestly, weigh everything once, read the band — and then check the item. That order is the whole discipline of freight class in one sentence.
Weighing and measuring like the carrier
The class is only as honest as the dimensions and weight behind it. A second worked box shows the method at a different point on the scale — and the measuring habits that keep the carrier’s re-measurement from surprising you.
Take a box of 40 × 30 × 24 inches weighing 180 lb. Its volume is 40 × 30 × 24 = 28,800 cubic inches, and 28,800 ÷ 1,728 = 16.67 cubic feet. Its density is 180 ÷ 16.67 = 10.80 lb/ft³, which sits squarely in the 10.5 to under 12 band — class 92.5, the band the page’s table associates with computers and boxed electronics. Compare it with the default box: smaller in every dimension, lighter in total, yet a higher class number in the wrong direction — no, a lower class number (92.5 against 150) because it is denser, and denser freight is cheaper freight per pound of space. The comparison is the point: class rewards density, not size or weight alone, and a compact heavy box will almost always out-rate a sprawling light one. If your freight can be packed tighter without damage, the class — and therefore the rate — improves with every cubic foot you remove.
Now measure that box the way the carrier will. Length, width and height are taken on the outside of the packed piece — box flaps, pallet and any overhang included — because the carrier’s dimensioner sees the outermost points, not the tidy ones. A box that measures 40 × 30 × 24 on your tape but 41 × 30 × 24 on the dimensioner, because a flap stands proud, has a volume of 29,520 cubic inches instead of 28,800 — 17.08 ft³ instead of 16.67 — and a density of 180 ÷ 17.08 = 10.54 lb/ft³, still class 92.5 here, but a box nearer a boundary would cross it on that flap alone. For matching pieces, measure one and count the rest in the pieces field; for mixed pieces, measure each distinct size separately, because a blended average density is not a class the carrier recognises. And weigh the packed piece, pallet included, on a scale that reads to the pound: the one-pound lesson of the first section — 239 lb against 240 lb, class 175 against 150 — is a lesson about scale accuracy as much as about bands. A bathroom scale under a pallet is not a weighing system; a freight scale, or the carrier’s own dock scale with its re-weigh fee, is.
One last habit closes the loop: photograph the packed, measured shipment before it leaves. If the carrier’s invoice re-measures the box larger or re-weighs it lighter, the photograph plus your recorded dimensions and weight is the evidence for the dispute — and disputes over class are won on measurements, not on arguments about fairness. The class is arithmetic on dimensions and weight; make your arithmetic checkable, and the carrier’s arithmetic has to agree with it or explain why it does not.
What NMFC is, and how to find the item that covers your freight
The National Motor Freight Classification, the NMFC, is the system the National Motor Freight Traffic Association maintains for classifying commodities for less-than-truckload rating. Each commodity is grouped under an NMFC item, and the item carries the class, or the rules for arriving at the class, so a shipment inherits the class of the item that covers it: the class belongs to the commodity description, not to the individual shipment, and two shipments of the same commodity under the same item bill at the same class, whatever carrier moves them. Density-based items are the ones this calculator models, where the class is read from the density scale, but many items carry a fixed class regardless of density, and others carry their own density breaks written into the item entry, which override the general scale for that commodity. The density figure is therefore the starting point for most freight, and the item entry is the authority that confirms or overrides it.
To find the item, start with the commodity as it ships, packaged, palletised, and described as the carrier will see it, and look it up in the NMFC through the NMFTA classification lookup tool, ClassIT, or through the carrier classification help, using the most specific description that matches the goods. Record the item number and the class together with the quote, because the item number is what lets the carrier, or a dispute, reproduce the classification, and a class quoted without its item number cannot be checked. Free class lists found online are not authoritative: they may be out of date, may describe a different item, or may omit the density breaks that change the answer, and the classification that governs a shipment is the current NMFC item as the carrier applies it, confirmed with the carrier in writing before booking where the class decides the rate.
Determining the class, in order: density, item entry, then the other three factors
Determine the class in the order the system actually applies it. First, measure and weigh the shipment as the carrier will: outside dimensions of the packaged handling unit, pallet and overhang included, and total weight, then density as weight divided by cubic feet, which is the figure this calculator computes and the figure the scale reads. Second, check the NMFC item entry for the commodity: where the item fixes a class, the fixed class governs, and where the item sets its own density breaks, those breaks govern, and the general density scale is only the answer where the item leaves the class to density. Third, consider the other three classification factors for items flagged on those grounds: stowability, how the freight sits with other freight, handling, what it takes to move it safely, and liability, what it is worth and how claim-prone it is, can each raise the class above the density band for freight that is awkward, fragile, or high-value, and since the 2025 density change, density is the primary factor for most freight while those three factors apply to the items flagged on handling, stowability, or liability grounds.
The final step is confirmation, and it is not optional where the rate matters. Carriers reweigh and remeasure with dimensioners, and a shipment measured larger or weighed lighter than declared will be reclassified and billed at the class found, with the photograph and the recorded dimensions and weight as the evidence for any dispute, as the guide on this page already advises. Confirm the class with the carrier before booking, in writing, with the item number, the dimensions, the weight, and the density stated, and keep that confirmation with the bill of lading, because a class agreed before loading is a rate, while a class discovered on the invoice is an argument. The classic 18-class chart this page publishes and the 13-tier density scale that took effect on 19 July 2025 under NMFTA Docket 2025-1, which the 2025-change section on this page describes, are two scales for the same job: the item entry and the carrier confirmation say which one governs the shipment in hand, and neither scale, read alone, settles a shipment whose item fixes its class.
Frequently asked questions
How is freight class calculated from density?
Measure the shipment’s length, width and height in inches and multiply them together, then divide by 1,728 to get cubic feet. Divide the total weight in pounds by the cubic feet and you have the density in pounds per cubic foot. The class is then read off the density scale: each class covers a band of densities, from class 50 at 50 lb/ft³ and up, down to class 500 at under 1. The pallet on this page — 48 × 40 × 36 inches at 240 lb — is 40.00 ft³, so its density is 6.00 lb/ft³ and its class is 150.
What density is freight class 150?
Class 150 covers densities from 6 to under 7 lb/ft³. The bottom of the band is included: a density of exactly 6.00 lb/ft³ is class 150, while 5.99 is class 175. Every band on the scale works the same way — the stated density is where that class begins — which is why this calculator reads the class from the unrounded density, never from the two-decimal figure on display.
Does the number of pieces change the density or the class?
Not when the pieces are identical. Enter the size of one piece, the number of pieces and the total weight of all of them, and the calculator multiplies the volume by the piece count and divides the total weight by the total volume — exactly the same as rating a single piece on its own. Four crates of 48 × 40 × 36 inches at 960 lb total give 160.00 ft³ and 6.00 lb/ft³, class 150, precisely what one crate at 240 lb gives. Where pieces differ in size, rate the odd one separately — mixed sizes have no single honest density.
Why did my carrier bill a different class than this calculator?
Usually for one of three reasons. First, the commodity’s NMFC item may set its own class, or rate it on a density scale with different breaks written into that item — the item rule beats the general chart. Second, stowability, handling or liability may move the shipment off its density band entirely. Third, the carrier may have reweighed or remeasured the freight at the dock and billed what their scale and dimensioner found — a half-inch of overhang or a forgotten pallet can change the numbers. The density class here is the standard estimate; the carrier’s class, built on the NMFC item, is the one that governs the invoice.
What changed in the NMFTA’s 2025 density update?
From 19 July 2025, the NMFTA began moving density-rated commodities onto a standard 13-band density scale with wider bands, topping out at class 400; on that scale, classes 77.5, 110, 150, 200 and 500 are assigned by specific item rather than read off density. Commodities are being migrated docket by docket, so the classic 18-class chart on this page and the newer scale both remain in use across different items. The practical takeaway has not changed: work out the density, get the estimate, then confirm the shipment against its NMFC item — in the NMFTA’s ClassIT+ or with your carrier — before you rely on a class for a quote.
How can I lower my freight class?
Raise the density — every pound per cubic foot counts, and near a band edge it counts double. Use the smallest box the freight safely fits, cut down void fill and empty air, compress or nest pieces where the goods allow it, and keep the pallet tight with no overhang inflating the footprint. The pallet on this page shows the stakes: at 240 lb it is exactly 6.00 lb/ft³ and class 150, but packed to 280 lb in the same footprint it would reach 7.00 lb/ft³ and class 125. What you must never do is misstate the weight or dimensions to reach a band — carriers verify both, and a correction rebills the shipment, usually with fees on top.
Why did one pound change my class?
Because bands start at their stated density. In the page’s default box (40.00 ft³), 239 lb gives 5.97 lb/ft³ and class 175, while 240 lb gives exactly 6.00 lb/ft³ and class 150 — one pound moves the shipment across the boundary into the next band. That is why weighing everything matters, pallet included: a 30 to 50 lb pallet left out of the weight can drag a borderline shipment a full band lighter than it really is, in the expensive direction.
Does the number of pieces change the class?
Not when the pieces are identical. Four matching crates totalling 960 lb have the same density — 6.00 lb/ft³, class 150 — as one crate at 240 lb, because the piece count scales the volume and the weight together and the ratio survives. The count matters for handling and for how many pieces the carrier moves, but it cannot change the density of identical freight. Mixed pieces are a different story: each distinct size and weight needs its own density, and the shipment’s class follows the item rule, not a blended average.
Is the classic scale still current after the 2025 change?
Partly — and that is the honest answer. In July 2025 the NMFTA began moving density-rated commodities onto a standardised 13-sub scale with wider bands and no classes above 400, with classes such as 77.5, 110, 150, 200 and 500 assigned by specific item instead of by density. Items are migrating docket by docket, so both worlds currently coexist. Use this page’s classic-scale class as your planning number, then settle the shipment by its NMFC item in the NMFTA’s ClassIT+ tool or with the carrier.
Why is my class different from the carrier’s invoice?
Most often one of three reasons. First, re-measurement: the carrier’s dimensioner sees the outermost points — box flaps, pallet and overhang included — and a bigger measured box means a lower density and a higher class. Second, the item rule: many commodities carry their own class or density breaks, and strong handling, stowability or liability characteristics can fix a class regardless of density. Third, the 2025 migration: if your commodity has already moved to the 13-sub scale, its item-assigned class outranks the density band. Check the measured dimensions, then the item, in that order.
What is NMFC?
The National Motor Freight Classification, the system maintained by the National Motor Freight Traffic Association that groups commodities into items, each carrying a freight class or the rules for arriving at one. A shipment inherits the class of the NMFC item that covers its commodity, which is why the item number, not just the class, is the record to keep with a quote.
How is LTL freight class determined?
In order: measure and weigh the shipment and compute density, check the NMFC item entry for a fixed class or its own density breaks, then apply stowability, handling, and liability for items flagged on those grounds, and confirm the result with the carrier before booking. Density is the primary factor for most freight, but the item entry can override the general scale.
What is the NMFC code for freight class 70?
There is no single code: class 70 is a class, not an item, and many different NMFC items can carry class 70 for different commodities. Find the item number for the commodity itself, through the NMFC lookup or the carrier, and the item entry will state the class. Quoting a class without its item number cannot be checked or disputed.
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