Calculator guide
BMR Calculator helps you explore the stated health question. Start with the labelled inputs, then review the method, worked example and limitations before using a result.
Formula or method
Estimate resting energy with the Mifflin–St Jeor equation: 10×kg + 6.25×cm − 5×age + sex-specific constant. Multiply BMR by the selected activity factor for a TDEE estimate.
How to use this calculator
- Enter age, sex, height and weight in the displayed units.
- Select the activity assumption for TDEE; resting energy and daily energy are different outputs.
Worked example
For a 30-year-old man at 70 kg and 175 cm, estimated BMR = 700+1093.75−150+5 = 1648.75 kcal/day before applying activity.
Understanding the result
Compare the output with the bmr calculator worked example using exactly the same inputs. A different assumption or rounding convention can produce a different displayed result; the output does not establish personal or professional suitability.
Limitations and assumptions
- An equation estimates resting needs; it does not measure metabolism or prescribe an intake target. Activity factors are approximate.
- The worked example demonstrates the stated assumptions, not a recommendation about your personal circumstances.
Frequently asked questions
Which inputs should I check first?
Follow the BMR Calculator input instructions above. Check each measurement, date, selection or expression before comparing results.
Why might my result differ from another tool?
Compare the other tool's bmr calculator method, input units, rounding and assumptions. A matching title does not guarantee that both tools answer the same question.
Does a linked reference certify this result?
No. A reference can explain a formula or provide background for BMR Calculator, but it does not endorse this website, validate personal inputs or establish professional suitability.
Sources
Educational and planning information only. Sources are attributed background or formula references, not endorsements. Verify consequential decisions with an appropriate qualified professional.