How it works
Formulas apply standard published equations or fee schedules in client-side JavaScript — not personalized medical or tax advice.
Formula
Mifflin-St Jeor (example): BMR = 10×kg + 6.25×cm − 5×age + s (s = +5 male, −161 female).
How to use BMR Calculator
- Enter measurements or body stats in the units shown (toggle ft/in vs metric if available).
- Select presets such as activity level, fee tier, or coat count.
- Submit or live-update to refresh results.
- Write down outputs with a margin buffer for waste, taxes, or medical variance.
Worked examples
Concrete numbers and cases you can check against the tool above.
Mifflin check
30-year-old, 170 cm, 70 kg — BMR near 1500 kcal before adding exercise calories.
When to use BMR Calculator
Knowing BMR separates baseline metabolism from exercise calories when interpreting smart scale trends.
Common use cases
- Explain why taller friends eat more at maintenance.
- Baseline before thyroid conversations with clinicians.
- Teaching nutrition units the difference BMR vs TDEE.
Inputs and outputs
- Feet, inches, pounds, or metric equivalents
- Numeric results with units
Privacy
This tool runs entirely in your browser. Your data never leaves your device — nothing is uploaded to our servers.
Frequently asked questions
- Is this medical or tax advice?
- No. Due dates, TDEE, and paycheck outputs are estimates; consult clinicians, IRS guidance, or payroll for official figures.
- Do marketplace fees change?
- Platforms update fee tables; treat results as planning approximations and verify on seller dashboards.
- Should I add waste factor?
- Yes for concrete, tile, and mulch — many pros add 5–10% beyond raw calculator output.