Duration Calculator

  • 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.
  • Age in Years, Months, and Days Calculator
    Calculate exact age in years, months, and days between a birth date and any date using accurate calendar borrowing and leap-year handling.
  • Age in Weeks Calculator
    Calculate your exact age in weeks from your date of birth. Enter a birth date to see total weeks, remaining days, and total days lived.
  • Age in Seconds Calculator
    Find out exactly how many seconds, minutes, hours and days old you are. Enter your birth date and an as-of date to calculate your age in seconds.
  • Age in Minutes Calculator
    Find out exactly how many minutes old you are. Enter your date of birth to instantly calculate your age in minutes, hours, days and seconds.
  • Age in Hours Calculator
    Find out exactly how many hours old you are. Enter your birth date to calculate your age in hours, days, and minutes instantly.
  • Slack Time Calculator
    Calculate slack (float) time for project activities from earliest/latest start and finish dates. Find total float and identify critical path tasks.
  • Oscar Marathon Calculator
    Plan your Oscar movie marathon. Calculate the total time to watch all the Best Picture nominees, including breaks between films, in hours and minutes.
  • Star Wars Marathon Calculator
    Plan your Star Wars movie marathon. Calculate the total watch time for the trilogy, saga, or all films including breaks between movies.
  • Adding Hours Calculator
    Add hours and minutes to any start time. Wraps past midnight in 24-hour format and shows how many days carry over. Free online time adding calculator.
  • Adding Hours and Minutes Calculator
    Add two times together in hours and minutes. Quickly sum durations and get the total in hours:minutes, total minutes, and decimal hours.
  • Add Years to a Date Calculator
    Add (or subtract) years to any date instantly. Find the exact future or past date, with automatic Feb 29 to Feb 28 leap-year adjustment.
  • Add Time Calculator
    Add hours, minutes and seconds to a start time. Get the resulting 24-hour clock time with automatic day-overflow handling. Free and instant.
  • Hours and Minutes Calculator
    Add and subtract multiple time segments in hours and minutes. Get the total duration normalized to hours, minutes and decimal hours instantly.
  • Days Off Calculator
    Calculate your days off in any period by subtracting working days and holidays taken from the total days. Quick, free, and easy to use.
  • Add Minutes Calculator
    Add minutes to any start time and get the resulting clock time. Handles hour carry-over and day rollover on a 24-hour clock. Free and instant.
  • Add Days Calculator
    Free Add Days Calculator: enter a start date and the number of days to add (or subtract) to instantly find the resulting calendar date and weekday.
  • Steak Cook Time Calculator
    Estimate how long to cook a steak per side based on its thickness and your desired doneness, from rare to well done. Get per-side and total grill times.
  • Ham Cooking Time Calculator
    Calculate how long to cook a ham by weight. Enter pounds and minutes per pound (e.g. 18 min/lb at 325°F for fully cooked bone-in) for total oven time.
  • Turkey Defrost Time Calculator
    Calculate how long to thaw a turkey by weight. Get safe refrigerator and cold-water defrost times instantly, based on USDA thawing guidelines.
  • Turkey Cooking Time Calculator
    Calculate how long to roast your turkey at 325°F based on weight. Get cooking time in hours and minutes for stuffed or unstuffed birds.
  • 6 Month Calculator
    Find the exact date 6 months from any start date. Calendar-month addition with automatic end-of-month adjustment and day-of-week output.
  • 90 Day Calculator
    Find the date 90 days from any start date. Add 90 (or any number of) days and see the exact future date and weekday instantly.

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