Calorie calculator
How many calories you use in a day, and about how many to eat to lose or gain weight, from Mifflin–St Jeor and your activity. Free, with no account or uploads.
How many calories a day you use
Type your age, height and weight and choose how active you are. Your aim, to keep, lose or gain, is a switch under it.
The formulas were measured separately for women and men.
Sitting work, getting about by car or bus, little exercise.
In a day (TDEE)
About 2,060 calories a day
1,350 at rest (Mifflin–St Jeor) × 1.53 for mostly sitting = about 2,060 kcal, 8,610 kJ.
FAO/WHO/UNU: 1.40–1.69 sedentary or light, 1.70–1.99 active, 2.00–2.40 vigorous.
A little help along the way
Follow these steps. Every option is explained underneath. Everything runs in your browser; nothing is sent anywhere or kept.
- Say what you want to knowBMI, calories a day, or body fat.
- Choose your measuresCentimetres and kilograms, or feet, inches and pounds.
- Type your age, height and weightAnd your sex for calories, body fat and a child's BMI; for body fat, your waist, neck and hips.
- Read the answerIn words first, with the formula it came from.
Questions people ask
- Which formula does it use?
- Mifflin–St Jeor (1990) for the energy you use at rest, times an activity level from the FAO/WHO/UNU report on human energy requirements (2004).
- How many calories should I eat to lose weight?
- Choose an aim such as Lose 0.5 kg a week; the page takes about 550 kcal a day off by the old 7,700 kcal a kilogram rule and says that real loss slows over time.
- Is this medical advice?
- No. It is arithmetic on the numbers you type; a doctor or dietitian can say what suits you, especially when you are ill, pregnant or growing.
This page is the BMI and calorie calculator, opened for this one job; every other tool it has is one press away. Each of its settings is explained on the BMI and calorie calculator's own page.
Read the step-by-step guide