Health calculators in plain words

Each calculator here runs in your browser and shows how the answer is worked out. Pick one below, enter your numbers and read the example underneath if you want to check the steps.

• BMI calculatorsBMI calculators for adults, teens and children, with a page for every age from 2 to 20 and for adult age groups.
• Calorie calculatorsCalorie calculators for daily needs, weight loss and muscle gain, with a page for every age from 18 to 70.
• Body fat calculatorsBody fat calculators using the US Navy tape measure method, with pages for each sex and age group.
• Pregnancy calculatorsPregnancy calculators for due dates and weeks, with a page for every week from 4 to 40 and for each month of the year.
• Water intake calculatorsWater intake calculators by body weight and exercise, with a page for every weight from 80 to 300 lb.
• Ideal weight calculatorsIdeal weight calculators using three classic formulas, with a page for every height from 4 ft 10 in to 6 ft 6 in.

Nothing you type leaves your device. The explainer under every calculator gives the formula in words, a worked example with real numbers and answers to common questions.

This calculator gives general information only. It is not medical advice. Talk to a doctor or other qualified health professional about your own health.