Health Calculator

Health Calculator

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Quick answer

Free health calculators - work out an exact age from a date of birth, or a BMI from height and weight.

Key facts

  • Age calculator and BMI calculator
  • Age is given in years, months and days
  • Nothing you enter leaves your device
  • Free, no signup
  • Works on a phone

About these tools

Two calculators for personal figures. The age calculator gives an exact age from a date of birth, broken down into years, months and days rather than rounded to a year. The BMI calculator gives a body mass index from height and weight, with the standard category it falls into.

How to choose

Enter the date or the measurements and read the result. For BMI, use the unit system you have - the calculator accepts both metric and imperial.

Frequently asked questions

Is BMI a reliable measure of health?

It is a rough screening figure, not a diagnosis. BMI takes no account of muscle mass, build or body composition, so athletes and older adults in particular can sit outside the expected range while being perfectly healthy. Treat it as one number among many and speak to a clinician about what it means for you.

Does the age calculator account for leap years?

Yes. It counts actual calendar days between the two dates, so leap years are handled correctly.

Is any of this stored?

No. Dates and measurements are processed in your browser and are not sent to a server.