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Everyday Math Calculator
Everyday arithmetic, reviewed October 2026 — exact for the inputs typed, not a substitute for certified measurement or medical advice.
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BMI is weight in kilograms divided by height in metres squared, labelled against the standard bands: under 18.5 Underweight, 18.5–24.9 Normal, 25–29.9 Overweight, 30+ Obese. At 70 kg and 175 cm the math is 70 ÷ 1.75² ≈ 22.86 — comfortably Normal. It is a one-number population screen, useful for tracking direction over time rather than diagnosing anything.
Enter weight in kg and height in cm (the page converts to metres internally). Read the band, then apply context the ratio cannot see: muscle weighs more than fat, so athletes read high; older adults and very tall people sit off-band too. Re-measure monthly under consistent conditions — morning, same scale — and watch the trend, not a single reading.
It does not measure body fat, account for age, sex, muscle mass, or frame size, and it is not medical advice — a clinician interprets the number alongside everything else.
Not medical advice.
No. It is a general screen; muscular, very tall, or older individuals may not fit the standard bands. A clinician can interpret it in context.
Kilograms and centimetres. Convert first if your figures are in pounds or feet — 1 kg ≈ 2.205 lb and 1 inch = 2.54 cm.
18.5 to 24.9 on the standard adult scale. Bands shift for children, athletes, and older adults, so treat the range as a starting point.
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