Combine a Mifflin–St Jeor BMR estimate with a configurable activity factor to estimate maintenance energy needs.
Calculate with the Calorie Calculator
Enter the details below. Your values stay in this browser and are validated before results are shown.
Calorie Calculator results
Calorie Calculator comparison
Exact values are provided in the accessible result table.
How to use the Calorie Calculator
- Select the requested method and unit system where available.
- Enter measured values carefully using the labels and active units.
- Select Calculate or press Enter.
- Read the estimate together with its method, assumptions, limitations, and safety notice.
Worked example
An estimated BMR of 1,600 kcal/day at a 1.55 activity factor gives about 2,480 maintenance kcal/day.
Interpreting the estimate
Use the result as a neutral planning estimate. Actual energy balance varies, and individualized dietary planning may require a qualified professional.
Limitations
- Not intended for children, teenagers, pregnancy, breastfeeding, clinical nutrition, or eating-disorder care.
- Activity categories are broad and may over- or underestimate actual expenditure.
Frequently asked questions
Why can actual calorie needs differ?
Movement, body composition, food processing, sleep, health, medication, and measurement error can all affect energy expenditure.
Is the calorie calculator a medical assessment?
No. It provides an educational estimate from the values entered and cannot account for every individual or clinical factor.
Does CalculatorCheck store my health information?
No. The calculation runs in your browser, and the entered values are not sent to a server or added to the page URL.