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BMR Calculator (3 Formulas)
Estimate resting calorie burn using Mifflin-St Jeor (default), Harris-Benedict revised, and Katch-McArdle (uses lean body mass for highest accuracy).
HEALTHEstimate calories burned at rest using three formulas: Mifflin-St Jeor (modern default), Harris-Benedict revised (1984), and Katch-McArdle (uses lean body mass — most accurate if you know body fat %).
BMR is calories your body burns at rest just keeping organs running. Multiply by an activity multiplier (1.2 sedentary → 1.9 athlete) to get TDEE (total daily energy expenditure). Mifflin-St Jeor is the most validated for the general adult population; Katch-McArdle is best for athletes; Harris-Benedict tends to overestimate.
Disclaimer: Predictive equations have ±10% error vs measured BMR (indirect calorimetry). For weight goals, adjust TDEE by 10-20% deficit/surplus and reassess every 2 weeks.
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Frequently Asked Questions
What is the BMR Calculator (3 Formulas) for?
Estimate calories burned at rest using three formulas: Mifflin-St Jeor (modern default), Harris-Benedict revised (1984), and Katch-McArdle (uses lean body mass — most accurate if you know body fat %).
How do I use the BMR Calculator (3 Formulas)?
BMR is calories your body burns at rest just keeping organs running. Multiply by an activity multiplier (1.2 sedentary → 1.9 athlete) to get TDEE (total daily energy expenditure). Mifflin-St Jeor is the most validated for the general adult population; Katch-McArdle is best for athletes; Harris-Benedict tends to overestimate.
How accurate are my bmr (3 formulas) results?
Predictive equations have ±10% error vs measured BMR (indirect calorimetry). For weight goals, adjust TDEE by 10-20% deficit/surplus and reassess every 2 weeks.
Is the BMR Calculator (3 Formulas) free to use?
Yes - every calculator on WhichCalc is completely free with no signup, no usage limits, and no tracking on the calculation itself. Results display instantly in your browser and your inputs are never sent to a server. Bookmark the page if you use this calculator regularly.
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