Age calculator
Find calendar age and the interval between two dates.
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Understanding your calculation
Uses calendar years, months and days, independent of your time zone. Month-end anniversaries are clamped to the last valid day; a February 29 birthday uses February 28 in non-leap years.
- Enter your own values and choose the applicable calculation options.
- Review the breakdown and assumptions; change one input to compare a scenario.
- Download the calculation CSV to retain your inputs and result for independent checking.
Limits and checks
Inputs are validated locally. Results are estimates using the stated model, without live market data, automatic tax classification or personalized financial advice.
Frequently asked questions
What assumptions does the age calculator use?
Uses calendar years, months and days, independent of your time zone. Month-end anniversaries are clamped to the last valid day; a February 29 birthday uses February 28 in non-leap years.
Is my content sent to a server?
No. Processing runs inside your browser. Optional editor recovery saves a draft on this device only. Read the privacy policy.
Will my original file be changed?
No. Downloaded results are separate copies. Open the finished output before sharing it or deleting an original.