Math calculator
Calorie Calculator
Estimate daily calorie needs from your BMR and activity level.
Health information only: this is a general estimate for adults, not medical advice or a personalized nutrition plan. Energy needs vary; consult a qualified health professional for individual guidance.
How this calculation works
Estimated TDEE = Mifflin–St Jeor BMR × activity factor (1.2, 1.375, 1.55, 1.725, or 1.9). Use the calculator above to enter your values. Inputs are checked before a result is shown, and calculations run locally in your browser.
BMR 1,650 × 1.2: 1,980 kcal/day estimate.
BMR 1,650 × 1.55: 2,557.5 kcal/day estimate.
BMR 1,650 × 1.725: 2,846.25 kcal/day estimate.
Formula source: Mifflin et al., American Journal of Clinical Nutrition (1990). The equation estimates resting energy expenditure; activity multipliers are rough estimates.
Frequently asked questions
How does the calorie calculator work?
Estimated TDEE = Mifflin–St Jeor BMR × activity factor (1.2, 1.375, 1.55, 1.725, or 1.9).
What is an example?
A BMR of 1,650 kcal/day at a 1.55 activity factor estimates about 2,558 kcal/day.
Can I enter decimal values?
Yes. Enter decimal values where appropriate. The calculator checks required inputs and displays a readable result.
Are results rounded?
Results are formatted for readability. Check the displayed formula and units when using the result.
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