How to use BMR & Daily Energy Calculator

1. Prepare the required inputs

Estimate adult resting energy needs with the Mifflin–St Jeor equation and an activity multiplier. Use the units and options beside each field. Results update as inputs change; reset returns to example inputs.

Measurement units: Metric (cm, kg) / Imperial (inches, pounds)
Height (cm / inches): minimum 1, maximum 300
Weight (kg / pounds): minimum 1, maximum 1400
Sex used by the formula: Male / Female
Age (years): minimum 18, maximum 100
Activity estimate: Sedentary / Light activity / Moderate activity / Very active / Extra active

2. Try a worked example

A 30-year-old male at 70 kg and 170 cm has estimated BMR 1,617.5 kcal/day.

3. Understand the calculation

BMR = 10 × kg + 6.25 × cm − 5 × age + 5 (male) or −161 (female). Daily energy = BMR × activity factor.

4. Read the assumptions

Adult estimates only, not a personalised calorie prescription. Activity factors and individual metabolism vary.

5. Check and compare results

Match entered values to their labels and units. Review output labels alongside the assumptions, then change one input at a time. A currency selector changes display labels without converting amounts. Use the available save or copy actions and retain the input values so the estimate can be reproduced.

6. Fix an invalid input

Complete required fields and respect the listed bounds. Check date order, age relationships and mode-specific requirements where relevant; the error message identifies invalid combinations. Reset to example inputs to recover. A valid calculation applies to its stated model and does not verify a real-world outcome.