Age Calculator

It counts full calendar years, then the remaining months and days up to the chosen date, accounting for varying month lengths and leap years. The calculator subtracts birth year from current year to get full years, then counts remaining months and days, adjusting for February's variable length and leap years automatically. This gives you precise age in years-months-days format (e.g., 25 years, 4 months, and 12 days) rather than just rounding to full years. Additional breakdowns in weeks, days, hours, minutes, and even seconds let you calculate age at any level of detail needed.

Yes — change the 'as of' date to any day and the age recalculates for that date instead of today. This is useful for calculating historical ages (how old was someone at a specific event), future ages (how old will someone be on their next birthday), or working with archived records with different date references. The calculator instantly recalculates all age breakdowns whenever you change the 'as of' date, making it easy to explore different time references without manual recalculation.

No. Everything runs locally in your browser using standard web APIs — your text, files and inputs are never uploaded to a server, so the tool works even offline once the page has loaded.