Duration Calculator

  • Expiration Date Calculator
    Find a product's expiration date by adding its shelf life in days to the manufacture date. Get the exact expiry date and days remaining instantly.
  • Every Second Calculator
    Count every second between two date-times. Enter a start and end date and time to get the exact total seconds, minutes, hours and days.
  • Minutes Between Two Times Calculator
    Calculate the exact number of minutes between two times of day. Handles overnight spans automatically and shows the result in hours and minutes too.
  • Months Between Two Dates Calculator
    Find how many months are between two dates. Enter a start and end date to get the total months including a fractional part based on days.
  • Time Adder Calculator
    Add multiple time durations together. Enter hours, minutes and seconds for up to three entries and get the total in normalized h:m:s format.
  • Working Days Calculator
    Count the number of working (business) days between two dates, excluding Saturdays and Sundays. Inclusive of both start and end dates.
  • Time to Hours Calculator
    Convert hours, minutes and seconds into decimal hours instantly. Free time-to-hours calculator with total minutes and seconds breakdown.
  • Years Between Two Dates Calculator
    Calculate the number of years between two dates instantly. Enter a start and end date to get the exact years and total days elapsed.
  • Clock Duration Calculator
    Calculate the elapsed time between two clock times. Get hours, minutes, total minutes, and decimal hours — handles overnight spans past midnight.
  • Count Hours Calculator
    Count the hours between a start and end time, subtract breaks, and get the result in decimal hours and hours-and-minutes. Free, fast, and easy.
  • Elapsed Time Calculator
    Calculate the elapsed time between two dates and times. Get the result in days, hours, minutes and seconds, plus totals for each unit.
  • Hours to Decimal Calculator
    Convert hours, minutes and seconds to decimal hours instantly. Perfect for payroll and timesheets using decimal_hours = h + m/60 + s/3600.
  • Ideal Egg Boiling Calculator
    Find the perfect egg boiling time for soft, medium, or hard eggs. Adjusts for egg size and altitude so your boiled eggs come out just right.
  • Turkey Thawing Calculator
    Calculate how long to thaw a turkey by weight using the refrigerator or cold water method. Plan Thanksgiving safely with estimated thaw times.
  • Medicine 3 Times a Day Calculator
    Calculate when to take medicine 3 times a day. Enter your waking hours and dose count to get evenly spaced dose times and the hours between each dose.
  • Sobriety Calculator
    Count your days sober from your start date and see weeks, years, and the money you've saved by quitting. Free, instant sobriety tracker.
  • Deadline Calculator
    Calculate a project deadline by adding a number of days to a start date. Choose calendar days or skip weekends, and see how many days remain until the due date.
  • Time Unit Conversion Calculator
    Convert any time value across 16 units at once: Planck time, atomic units, nanoseconds, seconds, minutes, hours, days, weeks, months and years.
  • Elapsed Time Between Two Times Calculator
    Calculate the elapsed time between a start time and an end time. Get the duration as H:MM:SS and totaled in hours, minutes, and seconds, with overnight rollover.
  • Days Old Calculator
    Find out exactly how many days old you are. Enter your birth date and an end date to get total days, weeks, and hours between two dates.
  • Time Unit to Days + H:M:S Calculator
    Convert hours, minutes, or seconds into whole days plus a remaining hours:minutes:seconds breakdown. Fast, precise duration normalization tool.
  • Days Between Two Dates Calculator
    Find the days, weeks, months and years between two dates. Supports Western (CE) years and Japanese calendar eras (Meiji to Reiwa). Free date difference tool.
  • Date Plus Days Calculator
    Add or subtract days from a date to find the resulting date and weekday. Supports negative days, count-first-day option, and an optional Japanese era year input.
  • Date Duration Calculator
    Calculate the exact duration between two dates with this Date Duration Calculator. Input start and end dates to instantly determine the time span in years, months, weeks, and days.

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