Calorie Calculator
This estimates how many calories you use in a typical day, based on your size, age, sex and how active you are. It is a starting estimate, not a measurement.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
First the calculator works out your resting energy use with the Mifflin-St Jeor equation: 10 times weight in kilograms, plus 6.25 times height in centimetres, minus 5 times age, then plus 5 for men or minus 161 for women.
That resting figure is then multiplied by an activity factor, from 1.2 for mostly sitting up to 1.725 for hard exercise most days.
Worked example
At 40 years old, 68 in tall and 160 lb, with the activity level you chose, the estimate is 1,986 calories a day.
Questions
Is this exact?
No. Formulas give an estimate, and real needs vary with muscle, health and daily habits. Treat the number as a starting point.
Which activity level should I pick?
Choose the one that fits a typical week. If you are unsure, pick the lower level and adjust later, since that is the safer starting point.
Does this tell me how much to eat?
It shows an estimate of energy use only. Deciding what to eat is a choice for you, with a doctor or dietitian if you want help.
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