Calorie & BMR Calculator
Estimate daily calories from your metabolism and activity.
Reviewed by Zerunio’s medical team
This estimates how many calories you burn a day – your resting metabolism (BMR) plus movement. Use it as a starting point for eating to maintain, lose, or gain weight.
This tool gives general estimates for education only – it is not medical advice. Talk to a clinician about your health.
Frequently asked questions
How many calories should I eat to lose weight?
A common approach is eating about 500 calories a day below your maintenance figure, which tends to lose roughly half a kilo a week. Very low intakes can backfire – go gradual.
What is BMR?
Basal metabolic rate is the energy your body burns at complete rest to keep organs running. Your daily total is your BMR multiplied by how active you are.
Which formula does this use?
The Mifflin-St Jeor equation, which is one of the most accurate general estimates for healthy adults.
Why is my number different from another calculator?
Different tools use different formulas and activity multipliers. Treat any figure as an estimate and adjust based on how your weight actually changes over a few weeks.