Waist-to-Hip Ratio Calculator (WHO Risk Bands)
One ratio, WHO risk bands, centimetres or inches.
BMI & Daily Calorie Intake Calculator
Track BMI and daily calorie needs.
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About BMI & Daily Calorie Intake Calculator
Compute BMI from height/weight and estimate daily calorie intake with the Mifflin-St Jeor formula.
How BMI is calculated
BMI equals weight in kilograms divided by height in metres squared. WHO bands classify under 18.5 as underweight, 18.5 to 24.9 as healthy, 25 to 29.9 as overweight, and 30 or above as obese. The Mifflin-St Jeor equation then estimates resting calorie burn from weight, height, age, and sex, scaled by activity level for daily intake.
What BMI cannot tell you
BMI ignores muscle mass, bone density, and fat distribution, so athletes often score as overweight while carrying little body fat. Waist circumference and waist-to-hip ratio complement BMI for a fuller picture. Treat BMI as a screening signal, not a diagnosis, and discuss concerns with a clinician.
📐 Methodology & Reference Accuracy:
Calculations, formulas, and conversions execute locally in your web browser. Output models are benchmarked against official reference standards and updated for 2026.
🔒 This tool runs entirely in your browser. Nothing is uploaded or stored.
Background reading: Bmi Calculator on Wikipedia. More: all calculators.
Frequently Asked Questions about BMI & Daily Calorie Intake Calculator
What is a healthy BMI?
The WHO healthy range is 18.5 to 24.9. Values below or above it suggest underweight or overweight, but body composition matters more than the number alone.
How many calories should I eat per day?
It depends on size, age, sex, and activity. This calculator estimates maintenance calories with Mifflin-St Jeor; subtract roughly 500 per day for steady gradual loss, and never drop below safe minimums without guidance.
Is BMI accurate for muscular people?
No. Muscle weighs more than fat per volume, so muscular builds score high without excess fat. Pair BMI with waist measurements for a fairer assessment.
Does age change BMI interpretation?
The formula is the same, but older adults naturally carry more fat at a given BMI. Clinicians interpret senior results more leniently and weigh other health markers.
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