Health calculator
Calorie Calculator
Estimate daily maintenance calories from age, sex, height, weight, and activity level.
Formula
Mifflin-St Jeor estimate
Calorie estimates are general planning tools and should not replace advice from a qualified health professional.
BMR = 10w + 6.25h - 5a + s; TDEE = BMR x activity factor
For men s = 5, for women s = -161. Multiply BMR by activity level for daily calories.
Sources and assumptions
Source notes
This calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.
- Effective year
- Current rules
- Last verified
- 2026-06-18
Calorie estimates are general planning tools and should not replace advice from a qualified health professional.
Official and reference sources
Assumptions
- The Mifflin-St Jeor male or female constant is selected from the sex input.
- Maintenance calories multiply estimated resting energy expenditure by the selected activity factor.
Not included
- Pregnancy, lactation, growth, illness, medication effects, metabolic adaptation, and measured energy expenditure.
FAQs
What are maintenance calories?+
Maintenance calories estimate the daily intake needed to keep body weight roughly stable.
Why is my actual result different?+
Metabolism, tracking accuracy, activity, sleep, and health conditions can all affect real-world calorie needs.
How does the Calorie Calculator calculate the result?+
It uses the Mifflin-St Jeor estimate: BMR = 10w + 6.25h - 5a + s; TDEE = BMR x activity factor. For men s = 5, for women s = -161. Multiply BMR by activity level for daily calories.
What information do I need to use the Calorie Calculator?+
Estimate daily maintenance calories from age, sex, height, weight, and activity level.
How accurate is the Calorie Calculator?+
Calorie Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Calorie Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
Health guide
How to use the Calorie Calculator
Estimate daily maintenance calories from age, sex, height, weight, and activity level. The page also explains the mifflin-St Jeor estimate and shows a practical example: For men s = 5, for women s = -161. Multiply BMR by activity level for daily calories.
- 1
Enter your details
Enter age, sex, height, weight, and activity level, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the mifflin-St Jeor estimate: BMR = 10w + 6.25h - 5a + s; TDEE = BMR x activity factor.
- 3
Compare scenarios
Change one or more inputs to see how they affect the calorie Calculator result before you use the estimate.
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