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Calculate your BMI and estimate your daily calorie needs in seconds.
Try the calculators Explore nutritionQuick estimates to help you understand your body and daily energy needs.
Check your Body Mass Index
Estimate your maintenance calories
This is an estimate, not a personalised nutrition prescription.
BMI compares weight with height to provide a simple screening measure. For adults, the commonly used ranges are below 18.5 for underweight, 18.5–24.9 for a healthy-weight range, 25–29.9 for overweight and 30 or above for obesity.
BMI does not measure body fat directly and cannot distinguish muscle from fat. Age, build, ethnicity, pregnancy and some health conditions can also affect how useful the number is for an individual. Treat it as a starting point rather than a diagnosis.
The daily calorie calculator estimates resting energy needs using the Mifflin–St Jeor equation, then applies an activity multiplier to estimate maintenance calories. Real energy needs vary, so the result is best used as an initial estimate and adjusted using changes in body weight, activity and appetite over time.
The mild-loss and mild-gain figures are simple planning estimates, not personalised diet prescriptions. See how HealthCalc.fit calculates its results for formulas, assumptions and limitations.
For useful comparisons, measure weight under similar conditions and enter your current height and activity level.
A single calculation is less informative than a trend. Day-to-day body weight can change because of hydration, food and other normal factors.
Online calculators cannot account for your full medical history. Seek professional advice when health conditions, pregnancy or eating concerns are involved.
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