Maintenance calories are the calories that keep your weight steady: not gaining, not losing, just holding. The number is your total daily energy expenditure, or TDEE, which is your basal metabolic rate multiplied by an activity factor. Basal metabolic rate is what you burn at rest, keeping your body running. The activity factor covers everything else, from walking to training. Estimate both honestly and you have a maintenance number you can eat to, adjust from, and trust more than any generic chart.

The formula: BMR times activity

Basal metabolic rate is estimated by the Mifflin-St Jeor equation, the most widely used formula for adults. For women it is 10 times weight in kilograms, plus 6.25 times height in centimetres, minus 5 times age, minus 161. For men the last term is plus 5 instead of minus 161. The result is calories per day at complete rest.

Activity multiplies that resting figure into your total daily energy expenditure. The standard multipliers are 1.2 for sedentary, 1.375 for lightly active, 1.55 for moderately active, 1.725 for very active, and 1.9 for extremely active. Moderately active means exercise three to five days a week, not a physical job plus training: most people overestimate their multiplier, and that is the largest single source of error in maintenance estimates.

The worked example: a 35-year-old woman, 70 kg, 168 cm. BMR is 700 plus 1,050 minus 175 minus 161, or 1,414 calories. Moderately active, times 1.55, gives about 2,192, which the calculator rounds to about 2,190. Change one input and the answer moves: at lightly active the same woman maintains on about 1,944, and at very active on about 2,439.

Maintenance is a range, not a number

No formula knows your exact burn. Bodies differ in muscle mass, genetics, and daily movement outside exercise, and the formula is an average fitted to populations. Treat the calculator output as the centre of a range about 100 to 200 calories wide in either direction, and confirm it by eating to it for three weeks while weighing weekly.

If the weekly average is flat, the number is right. If it climbs, the true maintenance is lower than the estimate, and you trim 100 to 200 calories. If it falls, the true maintenance is higher, and you add. This confirmation step is not optional polish: it is the difference between a formula output and a personal number.

Daily weight noise is large, several pounds from water, glycogen, and meal timing, so compare weekly averages, not single days. Weigh at the same time, in the same conditions, and look at the trend across at least three weeks before adjusting.

Choosing the activity multiplier honestly

Sedentary, 1.2, means a desk job with little exercise. Lightly active, 1.375, means light exercise one to three days a week. Moderately active, 1.55, means moderate exercise three to five days a week. Very active, 1.725, means hard exercise six to seven days a week, and extremely active, 1.9, means a physical job plus hard training, or twice-daily training.

The honest test is your week, not your best day. Three gym sessions and a desk job is moderately active, not very. A physical job with no formal training can be very active. People who train hard but sit the rest of the day often land one tier lower than they expect, and the calculator result drops by 150 to 250 calories when they correct it.

Body fat percentage refines the estimate where the calculator asks for it. Two people at 80 kg with different muscle mass burn differently at rest, because muscle is more metabolically active than fat. If you know your body fat, enter it: the calculator adjusts the resting figure, and the maintenance number follows.

From maintenance to a goal: deficit and surplus

Weight loss starts from maintenance minus 300 to 500 calories, which typically loses about 0.25 to 0.5 kg a week. Larger deficits lose faster but cost more muscle and adherence, and they are harder to sustain. Weight gain starts from maintenance plus 200 to 300 calories, enough to build without excessive fat gain.

The macro split sits on top of the calorie target: protein first, from body weight, then carbs and fat by preference. The companion macro guide works through the splits. The order matters: calories decide the direction of weight change, and macros decide what kind of weight changes.

Re-check maintenance after a weight change of about 5 percent, because a lighter body burns less. Someone who lost 5 kg on a 2,000-calorie target may now maintain on 1,850, and the old target quietly becomes a surplus. Re-running the calculator every few months keeps the goal honest.

When maintenance moves without you noticing

Maintenance falls with age, slowly, a few calories a year, and faster with muscle loss. It rises with training volume and falls when training stops. Illness, injury, and a change from an active job to a desk job can move it by hundreds of calories in a month, which is why a number that worked last year can fail this year.

Adaptive thermogenesis is the smaller, real effect behind plateaus: after sustained weight loss, the body burns slightly less than the formula predicts, beyond what the smaller body explains. The effect is modest, tens to low hundreds of calories, and it reverses with time at maintenance. The practical response is a maintenance break, eating at the new maintenance for several weeks, before the next deficit.

Seasonal movement counts too. A summer of walking and outdoor activity against a winter of sitting can shift maintenance by 200 calories or more. If weight creeps up every winter, the cause is usually the activity change, not the food alone, and the fix is steps as much as calories.

Frequently Asked Questions

What is a maintenance calorie calculator?

It estimates the calories that keep your weight steady, your total daily energy expenditure. It computes basal metabolic rate from your stats and multiplies by an activity factor.

How do I calculate my maintenance calories by hand?

Use Mifflin-St Jeor for BMR, then multiply by an activity factor: 1.2 sedentary, 1.375 lightly active, 1.55 moderately active, 1.725 very active, 1.9 extremely active. A 35-year-old woman, 70 kg, 168 cm, moderately active, gets about 2,190.

What is the difference between BMR and maintenance calories?

BMR is what you burn at complete rest. Maintenance calories, or TDEE, are BMR times activity, covering movement, exercise, and daily life. Maintenance is always higher than BMR.

How accurate are maintenance calorie calculators?

They give a centre point, usually within 100 to 200 calories of the truth. Confirm by eating to the number for three weeks and watching the weekly weight average: flat means right, rising means trim, falling means add.

How do I lose weight from my maintenance calories?

Subtract 300 to 500 calories, keep protein high, and hold the deficit for at least three weeks before judging. Larger deficits lose faster but cost more muscle and adherence.

Does muscle mass change my maintenance calories?

Yes. Muscle burns more at rest than fat, so two people at the same weight with different body fat have different BMRs. Entering body fat percentage refines the estimate where the calculator asks for it.