BodyCalMaintenance means eating what you burn
Weight maintenance is beautifully simple in principle: eat the same number of calories you burn, and your weight holds steady. Eat more and you gain; eat less and you lose. The number you're looking for is called your TDEE — Total Daily Energy Expenditure — the total calories your body uses in a day.
As a rough guide, maintenance is around 1,800–2,400 calories a day for women and 2,200–3,000 for men, but those ranges are wide because the real number depends heavily on your size, muscle mass, and how active you are. Guessing from a generic chart is where most people go wrong — your maintenance is personal.
What actually makes up your maintenance calories
Your TDEE is built from four parts. The biggest, at 60–70%, is your basal metabolic rate (BMR) — the calories you burn just staying alive: heartbeat, breathing, brain, organs. Next is physical activity, both formal exercise and the incidental movement of daily life. Then there's the thermic effect of food (you burn roughly 10% of your calories just digesting), and finally the small amount spent regulating body temperature.
The two parts you can move most are activity and muscle mass. More muscle raises your BMR around the clock, and more daily movement lifts the activity slice — which is why two people the same weight can have very different maintenance needs.
How to find your exact number
Rather than guess, calculate it. Our TDEE calculator takes your age, sex, height, weight, and activity level and returns your maintenance calories with a breakdown across every activity level, so you can see how much a more (or less) active day changes things.
Then verify it against reality. Eat at your estimated maintenance for two to three weeks and track your weight. If it holds steady, you've nailed it. If it's slowly rising or falling, adjust by 100–150 calories and re-check. Formulas get you 90% of the way; your own trend confirms the rest.
Why your maintenance number keeps changing
Maintenance isn't a fixed number for life. It drops as you lose weight (a smaller body burns less), falls gradually with age as muscle naturally declines, and shifts whenever your activity changes — a new desk job, an injury, a new training routine. This is why the calorie target that kept you steady in your twenties can quietly cause weight gain a decade later, even if nothing about your eating changed.
The fix is to recalculate periodically, especially after a big weight change or a shift in lifestyle. Keeping some muscle through resistance training is the single best way to protect your maintenance number as you age.
How to stop slow weight creep
Most weight gain isn't dramatic — it's a couple of hundred surplus calories a day that quietly add up to a few pounds a year. The antidote isn't dieting; it's knowing your maintenance number and staying roughly within it. Even a loose awareness of your TDEE keeps you anchored.
Weigh yourself weekly and watch the monthly average, not daily wobbles. If the trend drifts up, trim back toward maintenance or add movement before it becomes a bigger project. Maintenance is a skill, and the people who hold their weight for years are simply the ones who know their number and check in on it. Find yours with the TDEE calculator and let it be your anchor.