Estimate the calories your body burns at complete rest. Enter your age, sex, height, and weight to estimate your daily energy needs.
Complete the form and select “Calculate result.” Your measurements never leave this page.
A transparent overview of the inputs, method, and appropriate interpretation.
It uses age, sex, height, and weight in the Mifflin–St Jeor equation to estimate the energy your body uses at complete rest.
Mifflin–St Jeor energy equationClear answers to help you understand and use your estimate.
Yes. It is free, runs in your browser, requires no account, and does not store the measurements you enter.
No. This result is an educational estimate, not a diagnosis or treatment recommendation. A qualified professional can interpret it within your complete health and training context.
Actual energy use changes with activity, muscle mass, sleep, climate, medication, health conditions, and normal metabolic variation.
Recalculate after a meaningful change in body weight or other inputs. Review the displayed activity assumptions when using the result to plan calories.
Read our calculation methodology →Still have questions? Explore the guides ↗