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Business & Everyday
Enter a birth date and reference date to calculate completed age, total days lived, elapsed weeks, and time until the next birthday.
How to read these results
These values are calculated from your current inputs. Check the input units and this calculator’s stated assumptions or included scope alongside the results.
Primary result: Completed age
Supporting value: Total elapsed days
Use the result for your next decision
Compare the primary result with your target or another option, then change only the conditions you want to test and recalculate. Before acting, also check the calculator-specific guidance and applicable conditions.
Keep up to three calculated result snapshots only for this page session and compare them with the current result. Inputs, URLs, and browser storage are not used.
Shares only the calculator name and displayed result summary. Inputs and URLs are not included or stored.
Uses your browser’s print feature without uploading or automatically saving your inputs or results.
Completed age counts birthdays already reached by the as-of date. For Feb 29 births, this calculator uses Feb 28 as the birthday in non-leap years.
The calculator compares calendar dates for completed years, then uses the UTC day difference between the two dates for total elapsed days and weeks.
Use a specific as-of date when you need age at a past or future event. Legal or program-specific age rules can differ, so verify the applicable rule separately.