BMR Calculator — Basal Metabolic Rate & Calorie Needs | ToolCircuit
Calculate BMR (Basal Metabolic Rate) with metric or imperial units. See daily calorie estimates by activity level. Free, client-side BMR calculator.
No uploads. Everything runs locally in your browser.
Calculate your Basal Metabolic Rate (BMR) using metric or imperial units, and see estimated daily calories for common activity levels. Runs locally for privacy.
Informational only — not medical advice.
Enter age, sex, weight, and height to calculate BMR.
What is BMR?
Basal Metabolic Rate estimates calories your body burns at rest to keep vital functions running.
BMR vs daily calories
BMR is resting energy; daily calorie needs depend on activity. Multipliers give rough maintenance calories; individual needs vary.
Benefits & use cases
- Estimate resting calorie burn to plan nutrition.
- See maintenance calories by activity level.
- Switch units for convenience (metric/imperial).
Disclaimer: Informational only, not medical advice.
How to use
- Enter age, sex, weight, and height (toggle metric/imperial).
- Click Calculate to see BMR and activity-based calorie estimates.
- Copy the result or load a sample; clear to start over.
Features
- BMR via Mifflin-St Jeor formula
- Metric (kg/cm) and imperial (lb/inches) support
- Activity-level calorie estimates
- Sample loader, copy, and clear actions
- Client-side; no data upload
FAQ
Is this free?
Yes. It runs in your browser with no uploads.
Do you store my data?
No. Inputs are processed locally only.
Which units are supported?
Metric (kg, cm) and Imperial (lb, inches).
What formula is used?
Mifflin-St Jeor: 10*kg + 6.25*cm - 5*age + s (male +5, female -161).
Is this medical advice?
No. It’s informational only; consult a professional for health guidance.