Exact age in years, months and days from any birth date — plus total days and next birthday countdown.
Born 1990-06-15, checked on 2026-01-01 → 35 years, 6 months, 17 days old.
The calculator borrows calendar arithmetic: full years first, then whole months, then leftover days — matching how people state ages verbally. Leap-day birthdays are treated as Feb 28 in non-leap years for 'next birthday' purposes.
Some tools count elapsed days ÷ 365.25 instead of calendar months. Calendar counting is the legal convention.
Yes — set 'Age at date' to any day you want to measure against.
Add or subtract days, weeks, months or years from a date to find deadlines and future dates.
Time between a start and end clock time, with optional break deduction for timesheets.
Count working days between two dates or find the date N business days away, skipping weekends.
Count days between two dates, with inclusive totals, weekday counts and weekend counts.
ISO-8601 week number for any date, plus that week's Monday-to-Sunday range.
Estimate monthly mortgage payments including principal, interest, taxes and insurance for any home price.