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BMR Calculator — Basal Metabolic Rate & Calorie Needs

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.

BMR calculator

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.

Result

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 BMR Calculator

  1. Enter age, sex, weight, and height (toggle metric/imperial).
  2. Click Calculate to see BMR and activity-based calorie estimates.
  3. Copy the result or load a sample; clear to start over.

Key features of BMR Calculator

  • 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

BMR Calculator — key benefits

  • Completely free with no signup or registration required.
  • Runs entirely in your browser — your data is never uploaded.
  • Works on desktop, tablet, and mobile devices.
  • Instant results with no waiting or processing queues.
  • Part of the ToolCircuit suite of free online utility tools tools.

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.

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