Maintenance Kcal: How to Calculate Yours (2026 Guide)

Your maintenance kcal is the number of kilocalories you’d eat in a day to keep your body weight exactly where it is — not losing, not gaining. It’s the single most useful number in nutrition, because every other goal is measured against it: to lose fat you eat below it, to gain muscle you eat above it, and to hold your weight you eat right at it.

The catch is that the number every calculator hands you is an estimate, and estimates drift. This guide explains what maintenance kcal really is, how to calculate it with the Mifflin-St Jeor equation, and — the part most guides skip — how to verify yours empirically in two weeks.

What Is Maintenance Kcal?

Maintenance kcal (also called maintenance calories or TDEE) is the amount of energy your body burns in a typical day — everything from keeping your organs running to walking to the bus stop to digesting your lunch. Eat that much and your weight holds steady. Eat more and you gain; eat less and you lose.

A quick terminology note, because it trips almost everyone up:

• kcal — short for kilocalorie. This is the unit on European and UK nutrition labels.
• Calorie (capital C) — the “food Calorie” used on US labels. 1 Calorie = 1 kcal.
• calories (lowercase) — in everyday speech and on most packaging, “calories” means kcal, not the small physics calorie.

So maintenance kcal, maintenance Calories, and maintenance calories are the same thing. We use “kcal” here because it’s the precise unit, but the math is identical whichever you see on a label.

Three related terms you’ll meet along the way:

• BMR (Basal Metabolic Rate) — the energy you’d burn lying in bed all day, doing nothing. It’s roughly 60–75% of your maintenance.
• TDEE (Total Daily Energy Expenditure) — BMR plus everything else (activity, digestion, fidgeting). TDEE = your maintenance kcal.
• Maintenance kcal — the intake that matches TDEE, so weight stays flat.

How to Calculate Maintenance Kcal

The most widely used method is a two-step estimate: predict your BMR with the Mifflin-St Jeor equation, then multiply it by an activity factor. The Mifflin-St Jeor equation, published in 1990, is currently the default BMR estimate for non-obese populations (Mifflin et al., 1990).

Step 1: Estimate your BMR

Using the Mifflin-St Jeor equation (weight in kg, height in cm, age in years):

• Men: BMR = 10 × weight + 6.25 × height − 5 × age + 5
• Women: BMR = 10 × weight + 6.25 × height − 5 × age − 161

Step 2: Apply your activity multiplier

Multiply your BMR by the factor that matches a typical day — and be honest about it (see the next section):

Step 3: Read your maintenance kcal (worked example)

Take a 30-year-old man, 75 kg, 178 cm, with a desk job and a couple of light workouts a week (lightly active):

1. BMR = 10×75 + 6.25×178 − 5×30 + 5 = 750 + 1112.5 − 150 + 5 ≈ 1,718 kcal
2. Maintenance kcal = 1,718 × 1.375 ≈ 2,360 kcal

So his estimated maintenance is about 2,360 kcal/day. Yours will differ — and as you’ll see next, the estimate is the starting point, not the answer.

The Activity Multiplier Table

The multiplier is where most estimates go wrong. People read “moderately active” and think I go to the gym three times a week, that’s me — but a 45-minute workout three times a week adds only a few hundred kcal, not enough to lift a sedentary desk worker into “moderate.” Scheduled exercise is a small slice of total daily movement; the rest is NEAT (non-exercise activity thermogenesis) — walking, standing, fidgeting, chores.

An honest rule of thumb: if you work a desk job, start at sedentary (1.2) or lightly active (1.375) even if you train a few times a week. Reserve “moderate” and above for people who are on their feet most of the day or train hard daily. Picking one level too high inflates your maintenance by 300–500 kcal — enough to quietly stall a fat-loss phase without you ever realizing why.

How to Verify Your Maintenance Kcal

Estimates are averages over millions of people; you are one person. The only way to know your maintenance kcal is to test it. Here’s a simple two-week protocol:

1. Pick your estimated maintenance from the calculation above and eat that amount every day for two weeks.
2. Weigh yourself each morning, after the bathroom and before eating or drinking. Log the number.
3. Compare weekly averages — average week 1, average week 2, then compare them. Day-to-day weight swings wildly (water, sodium, carbs, glycogen), so averages matter, not single days.
4. Read the result:
   • Weight stable (week-2 average within ~0.5 kg of week 1) → your estimate is your maintenance. Confirmed.
   • Weight up ~0.5 kg or more → you’re in a real surplus. Subtract ~250–500 kcal and re-test.
   • Weight down ~0.5 kg or more → you’re in a real deficit. Add ~250–500 kcal and re-test.

One cycle usually gets you within striking distance; a second nails it. The point is to stop trusting the formula and start trusting the scale-and-average trend.

Maintenance Kcal for Weight Loss vs Gain

Once you know your maintenance, every goal is just an offset from it.

For weight loss: eat below maintenance

A deficit of 250–500 kcal below maintenance is the sustainable range for most people — roughly 0.25–0.5 kg per week. Faster cuts feel quicker but trigger hunger, lethargy, and the rebound that regains the weight.

For muscle gain: eat above maintenance

A small surplus of 150–300 kcal above maintenance supports muscle gain with minimal fat. Bigger surpluses don’t build muscle faster — they just add fat. If you’re chasing size, you’ll usually care about macros (protein especially), not just total kcal.

Common Maintenance Kcal Mistakes

• Overestimating your activity level. The single most common error. Default lower, not higher.
• Treating the estimate as gospel. The formula is right on average; individuals can be 10–15% off either way. Verify.
• Panicking over week-1 weight. The first week of eating differently is mostly water and glycogen, not fat or muscle. Wait for the week-2 average.
• Borrowing someone else’s number. Your friend’s 2,400 kcal tells you nothing about yours — BMR and activity are personal.
• Forgetting that maintenance moves. As you lose or gain weight, and as your activity shifts, your maintenance shifts too. Re-check it every few kilograms.

Maintenance Kcal vs Calorie Deficit vs TDEE

These terms describe the same energy balance from different angles:

• TDEE = the energy you burn in a day (= maintenance kcal). Output.
• Maintenance kcal = the intake that matches TDEE, so weight is stable. Input equals output.
• Calorie deficit = eating below maintenance, for loss. Surplus = above, for gain.

So TDEE and maintenance kcal are two names for the same number; deficit and surplus are offsets from it.

Tracking Your Maintenance Kcal

A maintenance number only helps if you can actually hit it day to day — and that means tracking what you eat against your target. The friction of logging is the real bottleneck: if it takes five minutes per meal, you’ll quit before the two-week test finishes.

That’s the problem TellMeal was built to solve. Set your maintenance kcal as your daily goal, and the daily ring shows you where you stand at a glance; the calendar history shows the weekly trend that tells you whether your estimate was right. Logging is fast because you can describe a meal in plain words — “chicken rice bowl and a black coffee” — and TellMeal’s AI parses it into items with calories, instead of searching a database ingredient by ingredient.

TellMeal is $2.99/month, with 20 free AI analyses a month to try before paying. It requires an account to sync your data across devices, posts a public privacy policy, does not sell your data, and lets you delete your account in-app. For more on choosing a tracker, see our calorie tracker guide.

FAQ

How many kcal do I need to maintain my weight?

It depends on your BMR (from weight, height, age, and sex) and your activity level. For most adult men it lands around 2,400–2,800 kcal; for most adult women around 1,800–2,200 kcal — but the ranges are wide, so calculate yours and verify it.

Is maintenance kcal the same as TDEE?

Yes. TDEE (total daily energy expenditure) is the energy you burn; maintenance kcal is the intake that matches it. Same number, different name.

Is kcal the same as calories?

On food labels and in everyday use, yes — 1 kcal = 1 Calorie (capital C) = the “calories” you see on packaging. They’re all the same unit.

What’s a normal maintenance kcal?

There’s no single normal. A small, sedentary person might maintain on 1,600 kcal; a tall, active one on 3,000+. Use the formula, then verify with the two-week test.

How accurate is the Mifflin-St Jeor equation?

It’s within about 10% for most non-obese adults, but it can be off more for people who are very lean, very muscular, or at the extremes of age. Treat it as a starting estimate and verify empirically.

Can I find my maintenance kcal without a formula?

Yes. Eat normally for two weeks, track your weight each morning, and compare the weekly averages. If your weight was stable, your average intake over those two weeks was your maintenance — no equation required.

Put Your Maintenance Kcal to Work

Your maintenance kcal is the anchor for every nutrition goal — but only once you’ve verified it. Calculate it, test it for two weeks, and let the trend tell you the truth. Then set it as your daily goal and track against it. Try TellMeal to log meals in seconds and watch the weekly trend that confirms your number.

Last updated July 7, 2026. This article is informational and not medical advice. Health claims are cited where possible; please contact us if you spot an inaccuracy.