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Calculate your Basal Metabolic Rate to understand daily calorie burn at rest.
Mifflin-St Jeor
1,737
cal/day
Harris-Benedict
1,804
cal/day
Pro includes metabolic age comparison, activity-adjusted estimates, and nutrition planning tools.
Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic life-sustaining functions at complete rest - breathing, circulation, cell production, and temperature regulation.
BMR is calories burned at rest. TDEE (Total Daily Energy Expenditure) includes BMR plus calories burned through activity and exercise. TDEE = BMR x Activity Factor.
The Mifflin-St Jeor equation (1990) is considered more accurate for most people than the older Harris-Benedict equation (1919). Both are shown for comparison.
BMR Calculator is part of BriskTool's collection of free online tools. All processing runs entirely in your browser for maximum privacy and speed.