Maintenance Calorie Calculator
Find the exact number of calories your body needs to hold steady at your current weight, then see your macro breakdown and adjusted targets for weight loss or gain.
What "maintenance calories" really means
Maintenance calories are the specific number of calories that keeps your body weight exactly where it is right now — no gradual gain, no gradual loss, assuming your activity level stays roughly the same. It's a personal number, not a fixed figure that applies broadly, since it depends on your body size, composition, age, sex, and how active you are day to day. Two people who look similar on the outside can have genuinely different maintenance numbers based on differences in muscle mass or activity alone.
Knowing this number matters even if weight maintenance isn't your actual goal, because it's the reference point every calorie deficit or surplus is measured against. A "500-calorie deficit" only means something once you know what you're subtracting it from — this calculator gives you that baseline first, then builds your goal-specific target on top of it.
How maintenance calories are calculated
Maintenance Calories = BMR × Physical Activity Level (PAL)
This calculator first estimates your basal metabolic rate using the Mifflin-St Jeor
formula — 10 × weight(kg) + 6.25 × height(cm) − 5 × age + s, where s is
+5 for men and −161 for women — since it's widely regarded as one of the most
accurate general-population BMR formulas available and is recommended by the
Academy of Nutrition and Dietetics. That BMR is then multiplied by a PAL value
reflecting your typical activity level to produce your full maintenance calorie
number.
| PAL Value | Activity Description |
|---|---|
| 1.2 | Little or no exercise |
| 1.4 | Light exercise 1-2 days a week |
| 1.6 | Moderate exercise 2-3 days a week |
| 1.75 | Hard exercise 3-5 days a week |
| 2.0 | Physical job or hard exercise 6-7 days a week |
| 2.4 | Professional athlete-level training volume |
Worked example: 25-year-old woman, 168 cm, 62 kg
She exercises lightly once or twice a week — walking or an easy bike ride — putting her PAL at 1.4. Using the Mifflin-St Jeor formula for women:
BMR = 10 × 62 + 6.25 × 168 − 5 × 25 − 161 = 620 + 1,050 − 125 − 161 = 1,384 kcal/day
Multiplying by her PAL of 1.4 gives a maintenance calorie total of 1,384 × 1.4 ≈ 1,938 kcal/day. That's the number she'd eat daily to hold her current weight steady. If her goal were mild weight loss instead, this calculator would subtract roughly 250 kcal to land near 1,688 kcal/day — a modest, sustainable deficit rather than an aggressive one.
Turning maintenance calories into a macro plan
A total calorie number alone doesn't tell you what to actually eat — that's where macronutrient distribution comes in. General dietary guidelines put healthy ranges at roughly 10-35% of calories from protein, 45-65% from carbohydrates, and 20-35% from fat, with plenty of room to shift within those ranges depending on your specific goal. This calculator offers three common presets:
Balanced
20% protein, 50% carbs, 30% fat — a broadly healthy, sustainable everyday split that works well for general maintenance or a first attempt at structured eating.
Higher Protein
30% protein, 40% carbs, 30% fat — commonly used during fat-loss phases or muscle-building efforts, since higher protein intake supports muscle retention and satiety at a given calorie level.
Lower Carb
30% protein, 25% carbs, 45% fat — shifts a larger share of calories toward fat and away from carbohydrates, a pattern some people use for personal preference or specific dietary approaches.
Protein and carbohydrates both provide roughly 4 calories per gram, while fat provides about 9 calories per gram — which is why a relatively small percentage shift toward fat can move gram targets more than the same percentage shift in protein or carbs.
Why maintenance calories change after weight loss
Research on long-term weight loss shows that maintenance calories aren't fixed even for the same person — after meaningful weight loss, the body can become more metabolically efficient, quietly lowering basal metabolic rate, the energy cost of digesting food, and even non-exercise movement like fidgeting, often without the person noticing any conscious change in behavior. This is a major reason a maintenance number calculated during an active weight loss phase can turn into a mild surplus a few months later at a lower body weight, even if eating habits haven't changed at all — which is exactly why recalculating periodically, rather than relying on a single number indefinitely, matters.
Build out the rest of your nutrition picture
This calculator's BMR step uses the Mifflin-St Jeor formula by default, but if you want to compare it against the Harris-Benedict or Katch-McArdle formulas — or see a breakdown across every activity level side by side — the BMR calculator is built specifically for that deeper dive. Total calories and macros are only part of a complete nutrition plan, though; once your calorie and macro targets are set, the micronutrient calculator is the natural next stop for making sure your vitamin and mineral intake is on track too, not just your calories.
Maintenance calorie calculator — FAQ
What exactly are "maintenance calories"?
Maintenance calories are the number of calories you'd need to eat every day to keep your body weight exactly where it is right now, assuming your activity level stays the same. Eat above that number consistently and you'll gain weight over time; eat below it consistently and you'll lose weight. It's the baseline every weight loss or weight gain calorie target is built from, which is why calculating it accurately matters even if your actual goal isn't to stay the same weight.
How is my maintenance calorie number actually calculated?
This calculator first estimates your basal metabolic rate (BMR) using the Mifflin-St Jeor formula, then multiplies that BMR by a physical activity level (PAL) factor that reflects how active you are day to day, from 1.2 for little or no exercise up to 2.4 for professional-athlete-level training volume. The result, BMR × PAL, is your total daily energy expenditure (TDEE) — the same figure as your maintenance calories.
Is BMR the same thing as maintenance calories?
No. BMR is only what your body burns at complete rest — breathing, circulating blood, keeping warm — with zero additional activity. Maintenance calories add everything else on top: walking, working, exercising, fidgeting, digesting food. In formula terms, maintenance calories equal your BMR plus all the calories you burn through daily activity, which is exactly what multiplying BMR by a PAL factor is doing.
Why does my maintenance calorie number matter if I want to lose or gain weight?
Because weight loss and weight gain are both defined relative to maintenance, not as fixed numbers on their own. A calorie deficit only exists if you eat below your specific maintenance level, and a surplus only exists if you eat above it — the same 2,000 calories could be a deficit for one person and a surplus for another depending on their individual maintenance number. Getting maintenance right first is what makes any deficit or surplus target after it meaningful.
How should I split my maintenance calories between protein, carbs, and fat?
General dietary guidelines suggest roughly 10-35% of calories from protein, 45-65% from carbohydrates, and 20-35% from fat, with room to shift those ranges based on personal goals — higher protein is common for muscle-building or fat-loss phases, while lower carb approaches shift more calories toward fat instead. This calculator offers three preset splits so you can see how the same total calorie number translates into different gram targets depending on the approach you're following.
Why might I gain weight even while eating my "maintenance" calories?
The most common reason is that maintenance calories aren't static — they shift as your weight, activity level, age, or muscle mass change, so a number calculated six months ago may no longer reflect your current maintenance level. Research on weight loss maintenance specifically shows the body can become more metabolically efficient after significant weight loss, meaning a formerly accurate maintenance number can turn into a mild surplus without any change in your actual eating or exercise habits.
Does drinking water or eating right before weighing in affect this calculation?
No — this calculator uses your entered weight, height, age, sex, and activity level directly; it doesn't account for short-term fluctuations from hydration, sodium intake, or digestion, which can shift the number on a scale by a pound or two day to day without reflecting any real change in body fat or maintenance needs. Using a consistent, typical morning weight when entering your numbers here will give the most representative result.
How often should I recalculate my maintenance calories?
Recalculating every 10-15 pounds of weight change, or roughly every 2-3 months during an active weight loss or muscle-building phase, is a reasonable rule of thumb, since both your BMR and your effective activity level can shift meaningfully over that kind of timeframe. If your weight has been stable and your activity hasn't changed, there's little need to recalculate more often than that.
This calculator is for educational purposes only. It is not medical advice. Always consult a qualified doctor or health professional before making health decisions.
