BMI, healthy weight range, BMR and daily calories — computed on the spot as you type. Nothing is stored or sent anywhere.
Daily calorie needs (TDEE) by activity
| Activity level | Factor | kcal / day |
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General information only, not medical advice. BMI is a screening number: it does not measure body fat and can mislead for athletes, children, pregnant women and older adults. Talk to a doctor or registered dietitian about your own health.
Find your Body Mass Index and where it sits, the healthy weight range for your height, plus BMR and daily calorie estimates from the Mifflin–St Jeor formulas.
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Work out your Body Mass Index in metric or imperial units, see the healthy weight range for your height, and estimate your BMR and daily calorie needs (TDEE) from the same numbers — the standard formulas, computed instantly in your browser.
At 175 cm and 70 kg, the BMI is 70 ÷ 1.75² = 22.9 — comfortably inside the healthy 18.5–24.9 band, and the healthy weight range for that height works out to roughly 56.7–76.3 kg. A 30-year-old man with those numbers has a BMR of about 1,649 kcal a day before any activity is counted.
BMI is weight in kilograms divided by height in metres squared (imperial inputs are converted first). BMR uses the Mifflin–St Jeor equations — the formulas most dietitians default to: men, 10 × kg + 6.25 × cm − 5 × age + 5; women, the same minus 161. TDEE multiplies BMR by a standard activity factor from 1.2 (sedentary) to 1.9 (very active). Every figure is computed locally; nothing you enter leaves the page.
For most adults, 18.5 to 24.9 is classed as the healthy range, 25 to 29.9 as overweight, and 30 or above as obese, with underweight below 18.5. These are screening bands used by the WHO and national health services — a position inside or outside them is a prompt for a fuller picture, not a verdict on its own.
BMI only knows height and weight, so dense muscle, a broad frame, or being tall and lean in unusual proportions can push it up. Waist circumference and body-fat percentage add the context BMI lacks; a clinician can combine them properly.
BMR is the energy your body burns at complete rest just staying alive. TDEE is BMR multiplied by how active you are — your actual estimated daily calorie need. Eat around TDEE to maintain weight; sustained intakes below it trend down, above it trend up.
They are solid estimates, not measurements. The Mifflin–St Jeor formula is the most accurate of the common equations for most adults, but individual variation of ±10% is normal, and activity factors are coarse. Use them as a starting point and adjust from real results over a few weeks.
No. Height, weight, age and sex are used in the page and nowhere else — nothing is uploaded, saved or shared. Refresh the page and they are gone.