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BMR & TDEE Calculator: Mifflin-St Jeor Daily Calories
Resting calories, maintenance and a safe target.
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About BMR & TDEE Calculator: Mifflin-St Jeor Daily Calories
Calculate BMR with the Mifflin-St Jeor equation, scale it by activity for your TDEE, and get a daily calorie and protein target.
Why Mifflin-St Jeor?
The Mifflin-St Jeor equation was published in 1990 and generally predicts resting energy expenditure more accurately across modern body compositions than the older Harris-Benedict formula. It needs sex, age, height and weight, which you already have.
Why is there a floor on my calorie target?
A large deficit applied to a small body drives muscle and metabolic slowdown, so the target is clamped above 1200 kcal for women and 1500 for men. If your chosen goal would have fallen below that, the calculator raises it and says so.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Bmr Tdee Calculator on Wikipedia. More: all women's health.
Frequently Asked Questions about BMR & TDEE Calculator: Mifflin-St Jeor Daily Calories
What is the difference between BMR and TDEE?
BMR is the energy your body uses at complete rest, including breathing and circulation. TDEE is your BMR multiplied by an activity factor, so it covers your whole day including exercise and digestion.
How accurate is this calculator?
Treat it as a starting estimate with a 10-20% error band, not a lab measurement. Track your weight for two to three weeks and adjust intake by 200-300 kcal if it is not moving as expected.
What should my protein target be?
Pick a target per kilogram of body weight: 1.2 g/kg for light activity, 1.6 for active adults (the default here), 2.0 for athletes and 2.2 when cutting. Multiply by your weight, so 65 kg at 1.6 gives about 104 g per day.
Mifflin-St Jeor or Harris-Benedict?
This calculator uses Mifflin-St Jeor, which generally predicts resting burn more accurately for modern body compositions than the 1919 Harris-Benedict formula. The practical difference is usually a few percent, smaller than day-to-day activity swings.