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Numio

Age Calculator

Calculate completed years of age on a chosen reference date, including birthdays and leap-day births.

Input

Result (completed years)

Type or paste on the left — the result updates as you type.

For a February 29 birthday, February 28 is the anniversary in non-leap years. This is a calendar convention, not a legal age determination.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Format references

Tool page updated: