Calorie Calculator
Estimate your daily calories for fat loss, maintenance, or gain using body metrics, activity, and goal pace in one model.
For the sample profile (30y, 180 lb, 70 in), maintenance is 2,763 kcal/day; moderate fat loss starts near 2,211 kcal/day.
3,500 kcal
Energy-equivalent planning rule for ~1 lb of body mass change
1.2-1.9x
Standard activity multiplier range used to map BMR to TDEE
10-25%
Deficit range used here for gentle to aggressive fat-loss pacing
How to use calorie targets without guesswork
A calorie number only works when it is tied to maintenance and realistic pacing.
Maintenance calories are your control number
Most nutrition plans fail because people start with a random calorie target. Maintenance (TDEE) is your anchor. Deficit and surplus plans should be offsets from that number, not guesses.
Pace matters more than perfection
A plan you can run for months beats an aggressive target you quit in two weeks. Use gentle or moderate pacing first, then adjust from real weekly trend data.
Macro split protects the quality of weight change
Calories drive direction, but macro balance influences body composition. Prioritizing protein and minimum fat intake helps preserve lean mass while calories move up or down.
How the Calorie Calculator Works
Formula
kg = lbs × 0.45359237
cm = in × 2.54
BMR (male) = 10 × kg + 6.25 × cm − 5 × age + 5
BMR (female) = 10 × kg + 6.25 × cm − 5 × age − 161
TDEE = BMR × activity multiplier
Goal adjustment:
Lose = TDEE × (1 − deficit %)
Maintain = TDEE
Gain = TDEE × (1 + surplus %)
Daily delta = target calories − TDEE
Weekly change (lb) = (daily delta × 7) ÷ 3,500
Macro targets:
Protein grams = bodyweight(lb) × goal protein factor
Fat calories = target calories × goal fat share
Carb calories = target calories − protein calories − fat caloriesEnter age, sex, height, and weight
These inputs determine your resting energy estimate (BMR).
Set activity multiplier
Your BMR is scaled by activity to produce maintenance calories (TDEE).
Choose goal and pace
The model applies a deficit, no change, or surplus to produce the target calorie intake.
Review weekly trend estimate
Daily calorie delta is converted to a weekly planning estimate using 3,500 kcal/lb.
Use macro split
Protein and fat anchors are set first; carbs fill remaining calories.
This calculator is a planning model, not a diagnosis tool. Real-world energy expenditure can vary by sleep, stress, movement patterns, and training quality.
Use the result as a starting point, then adjust from your 2-4 week trend in body weight and performance instead of reacting to day-to-day scale noise.
Frequently Asked Questions
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Pair this with adjacent tools to tighten your nutrition plan.