How to use the BMR Calculator
Estimate resting energy from weight, height, age with the BMR Calculator. It includes Mifflin–St Jeor, Revised Harris–Benedict workflows, so choose the one that matches the values you actually know. Use it to understand an educational estimate and the inputs behind it, not as a diagnosis or treatment decision.
Step by step
- For the BMR example, select Mifflin–St Jeor and enter weight, height, age, sex. Keep each value in the unit displayed beside its field.
- Review the selected BMR workflow and inputs, then read resting energy in the result panel.
- Change one BMR assumption at a time to compare scenarios. Use Reset to restore this tool's worked example values.
How the calculation works
Selectable resting-metabolic-rate equations; neither is a daily calorie target.
Worked example
To reproduce the BMR worked example, reset the calculator. Select the Mifflin–St Jeor workflow. Use weight 75 kg; height 175 cm; age 35 years; sex Male. The result is resting energy of 1,673.75 kcal/day. Mifflin–St Jeor equation. Review the displayed units before comparing the result.
Understanding the result
The BMR reports resting energy. Use it to understand an educational estimate and the inputs behind it, not as a diagnosis or treatment decision. Educational estimate only; it cannot diagnose a condition or replace advice from a qualified health professional.
How to check the answer
Check the BMR estimate by confirming the units and supported ranges for weight, height, age. Compare resting energy with another published method or direct measurement when available, and ask a clinician before using it for a health decision.
Common questions
What does the BMR calculate?
Estimate resting energy from weight, height, age with the BMR Calculator.
Which inputs does the BMR example use?
The worked example uses weight, height, age, sex in the Mifflin–St Jeor workflow. Other workflows can show different fields. Keep the chosen workflow and units with the result when comparing calculations.
Is the BMR result exact?
Educational estimate only; it cannot diagnose a condition or replace advice from a qualified health professional. Recheck weight, height, age and use resting energy only for a decision where that level of precision is appropriate.