Health calculators
Explore all 22 calculators in the Health category — available now, fast and free.
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About Health calculators
Health calculators turn body measurements into everyday guidance: body mass index, ideal weight, daily calorie and water needs, macros, and pregnancy milestones. They give quick estimates for orientation, not a medical diagnosis.
Frequently asked questions
What is a healthy BMI range?
For most adults a body mass index between 18.5 and 24.9 is considered normal, but BMI ignores muscle and build, so treat it as a rough guide.
How many calories do I need per day?
Daily needs depend on age, sex, weight, height and activity level. A TDEE calculator estimates the calories to maintain your weight, which you can adjust to lose or gain.
How is ideal weight calculated?
Ideal weight formulas estimate a healthy range from your height and sex; treat the result as a guide, since build and muscle also matter.
How much water should I drink a day?
A common guide is about 30–35 ml per kilogram of body weight, adjusted up for heat and exercise; the water calculator estimates your daily target.
How are pregnancy weeks and the due date calculated?
Pregnancy is usually counted from the first day of the last period, with the due date about 40 weeks later; the calculator shows the current week and the estimated date.