Wellness Metrics Calculators

Use 28 free online health and fitness calculators for BMI, calories, nutrition, body composition, pregnancy, wellness, and exercise. Choose a category below to find the right health calculator.

BMI, body fat, and due-date calculators

Wellness calculators answer screening questions, not diagnoses. BMI from height and weight is the highest-volume starting point. Body fat is the next step when you have circumference or other measurements and want a composition estimate instead of a weight-only index.

Pregnancy due-date tools use last menstrual period or known conception dates. They do not replace obstetric dating. Read the limitations on each page before using a result for planning.

Which wellness tool to open

Start with BMI, then add composition or pregnancy timing if needed
Calculator	Use it when you need
BMI Calculator	Adult BMI from height and weight
Body Fat Calculator	Body-fat estimate from measurements
Due Date Calculator	Pregnancy timing from entered dates

Frequently asked questions

Is BMI enough to assess weight-related health?

No. BMI is a screening index. It does not measure body fat, fitness, or medical risk by itself. Use it with other information and professional advice.

When should I use a body fat calculator instead of BMI?

Use body fat when you have the measurements the method requires and need a composition estimate. Athletes and people with higher muscle mass often see a high BMI that does not reflect excess fat.

Are due-date results a medical appointment date?

No. The due-date calculator is an educational estimate from the dates you enter. Confirm timing with a qualified clinician.