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Frequently Asked Questions

BMI (Body Mass Index) is calculated by dividing weight in kg by height in metres squared. Formula: BMI = weight(kg) ÷ height(m)². Under 18.5 = Underweight, 18.5–24.9 = Normal, 25–29.9 = Overweight, 30+ = Obese.

Compound interest earns interest on both principal and accumulated interest. Formula: A = P(1 + r÷n)nt — P = principal, r = annual rate, n = compounds/year, t = years.

To find what % A is of B: (A ÷ B) × 100. Example: 45 of 200 = 22.5%. To find % of a number: multiply by (% ÷ 100).

Use the Mifflin–St Jeor equation. Men: 10w + 6.25h − 5a + 5. Women: 10w + 6.25h − 5a − 161. Multiply BMR by activity factor (1.2–1.725).