Age Calculator
Age Calculator by NIVITA HUF. Model scenarios, review calculations, explore detailed breakdowns and export results. Useful free planning tool.
Set your assumptions
Update the values to calculate your scenario.
Your calculation
Results update as you enter information.
JavaScript is required for interactive calculations.
How this calculator works
Calendar age counts full birthdays between the entered dates.
Important assumptions
Leap years and calendar month lengths are included in calendar calculations.
About the Age Calculator
What inputs are needed for the Age Calculator?
The calculator supports Date of birth; End / reference date; Days to add / subtract; Weekend days; Holidays (optional YYYY-MM-DD per line); Start hour (0–23). You can change each applicable input and immediately recalculate.
How does the Age Calculator calculate its results?
Calendar age counts full birthdays between the entered dates.
Can I save or share my calculation?
Yes. Use Export CSV for the results table, Copy results for a summary, Share scenario for an input-preserving link, or Print to keep a copy. No sign-in is needed.
Are calculator results guaranteed?
No. Calculations depend on the values entered and the assumptions shown. Financial products and regulatory rules can change, and investment projections do not guarantee returns.