BMR Calculator (Mifflin-St Jeor)
Calculate your Basal Metabolic Rate — the calories your body burns at rest — then estimate your daily needs based on activity level.
100% client-side · no upload
Basal Metabolic Rate
Daily calories (TDEE)
How to use
- Select your biological sex and enter your age, weight, and height.
- Choose your typical activity level from the dropdown.
- Click Calculate BMR to see your resting calorie burn and estimated daily needs.
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Preguntas frecuentes
- Is this BMR calculator free?
- Yes, completely free with no signup and no usage limits.
- Does my data leave my device?
- No. All calculations run in JavaScript inside your browser. Nothing is sent to any server.
- Does it work on mobile?
- Yes. The calculator is mobile-first and works on iPhone Safari and Android Chrome.