How it works
The method behind the number.
Calculate an age from a date of birth and today. This tool explains the calculation so you can adjust the assumptions to match your situation.
Your formula appears here after the calculator loads.
Everyday math
Age calculator
Calculate an age from a date of birth and today.
Free to use◌No account needed
Your result
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Enter your numbers to see the answer.
Age calculator guide
What does this calculator help you figure out?
Calculate an age from a date of birth and today. This free online calculator is designed for people who need a quick, transparent estimate rather than a black-box answer. Enter date of birth, calculate age on, review the assumptions, and adjust the values to match your project or situation.
How is the result calculated?
This calculator combines date of birth, calculate age on to produce a practical estimate.
Example and assumptions
For a useful first estimate, start with the sample values already shown in the calculator, then replace them with your own measurements or figures. Keep all dimensions in compatible units and round up where the result represents a quantity you must buy.
Results are planning estimates. Check the units, product coverage, carrier rules, or local rates before making a purchase or financial decision.
Common questions
Frequently asked questions
What does this age calculator calculate?
Calculate an age from a date of birth and today. The page shows the result, a breakdown, and the formula used so you can check the calculation.
What information do I need?
You will need date of birth, calculate age on. The labels and units beside each field show what the calculator expects.
How accurate is the result?
Results are planning estimates. Check the units, product coverage, carrier rules, or local rates before making a purchase or financial decision. Accuracy depends on the quality of the inputs and the assumptions used by the underlying formula.
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