Date & Health Calculators

Exact age, date arithmetic, and BMI in one place. Choose a tab, enter your dates or measurements, then read the guide below for worked examples.

Age

Age Calculator

Calculate your exact age, time between two dates, or countdown to your next birthday. Choose your calculation mode below.

Calculate Age & Dates

Calculate Age
Date Difference
Birthday Countdown
Enter your birth date
Use Today's Date

Date & Time

Date & Time Calculator

Choose the type of calculation you need: calculate the difference between two dates, find someone's age, or create a countdown to a future event.

Calculate Date & Time

Beginning date and time
Ending date and time
Enter your birth date
Leave empty for current age
Future date to count down to
Leave empty for current date

BMI

BMI Calculator

Enter your height and weight to calculate your BMI instantly. BMI is a simple index of weight-for-height commonly used to classify underweight, normal weight, overweight, and obesity.

Calculate Your BMI

Metric (cm) or imperial (feet + inches)
Enter your weight in kilograms or pounds

Date & health calculators — guide

Find exact age, add or subtract days from a date, or check BMI with metric or imperial units.

How to use

  1. Choose Age, Date & Time, or BMI from the tabs.
  2. Fill in dates or height/weight (use the unit toggles on BMI).
  3. Press Calculate and read the summary below the form.

Worked examples

Age: Born 15 March 2012 → on 18 May 2026 you are 14 years, 2 months, 3 days. See Age tab.
Date math: 10 June 2026 + 45 days → mid-July 2026 on the Date & Time tab.
BMI: Height 150 cm, weight 45 kg → BMI ≈ 20.0 (healthy range). Try the BMI tab.

Explore related tools

Converters hub Weight & length units Loan EMI Number tools
Is BMI a diagnosis?

No—it is a screening number. Talk to a parent, teacher, or doctor for health advice.