Maintenance Calorie Calculator

About the Maintenance Calorie Calculator

Your maintenance calorie level — technically called Total Daily Energy Expenditure (TDEE) — is the number of calories you need to eat each day to keep your weight stable. It is a useful baseline in nutrition: eat below it to lose fat, above it to gain weight, and at it to maintain. Getting this number wrong by even 300–500 calories per day can lead to unintended weight changes of 2–4 pounds per month.

This Maintenance Calorie Calculator uses up to four validated BMR equations — Mifflin-St Jeor, Harris-Benedict (revised), Katch-McArdle, and Cunningham — and averages their results to provide a balanced starting estimate. Each equation has strengths: Mifflin-St Jeor is a common general-population baseline, while Katch-McArdle uses lean body mass and can be more informative for athletic builds. Combining them helps show the likely range instead of relying on any single formula.

Beyond the raw number, the calculator provides a balanced macro split (30% protein, 35% carbs, 35% fat), calorie targets for different goals (aggressive cut to bulk), a visual BMR equation comparison, meal frequency distribution, and an activity factor reference. Whether you are reverse-dieting out of a cut, calibrating a new meal plan, or simply curious about your calorie needs, This calculator gives you a structured estimate to refine over time.

When This Page Helps

Every diet plan starts with a maintenance estimate, because cutting and bulking only make sense relative to that baseline. This calculator combines several common equations and turns the result into goal-based calorie targets and a meal split you can actually use.

How to Use the Inputs

1. Select your unit system (imperial or metric) and enter weight, height, and age.
2. Select your sex and activity level using the dropdown — be honest about activity.
3. Optionally enter body fat percentage to enable the Katch-McArdle and Cunningham equations.
4. Choose your preferred meal frequency for a per-meal calorie distribution.
5. Review the maintenance calorie estimate (averaged across all available equations).
6. Use the Calorie Goals table to find your target for cutting, maintaining, or bulking.
7. Check the BMR Equation Comparison chart to see how estimates vary by method.

Example Calculation

Tips & Best Practices

• Track weight daily for 2 weeks at estimated maintenance. If weight is stable (±0.5 lb), the estimate is accurate.
• Activity level selection is the biggest source of error — most people overestimate their activity.
• Add body fat percentage if available — it enables the Katch-McArdle equation, which is more accurate for lean individuals.
• Recalculate every 10 lbs of weight change or every 3 months.
• NEAT decreases during a calorie deficit (your body moves less subconsciously), so maintenance calories drop during a cut.
• Protein at 0.7–1.0 g/lb body weight helps preserve muscle whether cutting or bulking.

Why Calculators Are Starting Points, Not Fixed Answers

No BMR equation can perfectly predict your metabolism because individual variation is significant. Genetics, thyroid function, gut microbiome, sleep quality, stress, and NEAT all influence your actual energy expenditure. The calculated number gets you within 10% — close enough to start, but not precise enough to blindly follow. The real magic happens in the next 2–3 weeks: weigh yourself daily, average weekly, and adjust by 100–200 kcal if weight isn't tracking as expected.

Metabolic Adaptation and Reverse Dieting

Extended calorie deficits cause metabolic adaptation ("metabolic damage" is a misnomer — it's adaptation). BMR drops 5–15% beyond what weight loss accounts for, NEAT decreases, and hormones (leptin, thyroid, testosterone) downregulate. Reverse dieting — gradually increasing calories by 50–100 kcal/week after a cut — helps restore metabolic rate without rapid fat regain. It shows the baseline for planning a reverse diet.

The Thermic Effect of Food

About 10% of your TDEE comes from the Thermic Effect of Food (TEF) — the energy cost of digesting what you eat. Protein has the highest TEF (20–30%), followed by carbs (5–10%) and fat (0–3%). This is one reason high-protein diets are effective for body composition — you "waste" more calories processing protein.

Frequently Asked Questions

• How accurate are maintenance calorie calculators?

  BMR equations are typically within ±10% of actual measured values. Using this as a starting point and adjusting based on 2–3 weeks of weight tracking is usually the most practical refinement step. If your weight is stable, your intake matches your TDEE.

• What is the best BMR equation?

  There is no single best equation for every person. Mifflin-St Jeor is a common starting point for many adults, while Katch-McArdle can be useful when body fat percentage is known. This calculator averages the available equations to give a practical starting range rather than depending on one formula alone.

• Should I eat at maintenance or in a deficit?

  If your goal is fat loss, eat 15–25% below maintenance. For muscle gain, eat 10–20% above. For body recomposition (simultaneous fat loss and muscle gain), eat at or slightly below maintenance with high protein (1g/lb).

• Why does my weight fluctuate even at maintenance?

  Water retention, sodium intake, carbohydrate intake, menstrual cycle, and bowel contents cause daily fluctuations of 1–4 lbs. Judge trends over 2+ week averages, not daily readings.

• How should I distribute calories across meals?

  Total daily intake matters more than meal timing for body composition. However, distributing protein evenly (25–40g per meal) optimizes muscle protein synthesis. The calculator provides example meal splits for 2–6 meals.

• What is NEAT and why does it matter?

  Non-Exercise Activity Thermogenesis (NEAT) includes all movement that is not formal exercise: fidgeting, walking, standing, household chores. NEAT varies by 200–2,000+ kcal/day between individuals and is the largest source of TDEE variation beyond exercise.