Time and Date

  • Weeks Pregnant to Due Date Calculator
    Convert your current weeks pregnant into an estimated due date. Enter weeks and days to see how much time is left of a 40-week pregnancy.
  • Decimal Hours to Hours and Minutes Calculator
    Convert decimal hours (like 2.75) into hours and minutes instantly. Free, accurate decimal-time to HH:MM converter for timesheets and payroll.
  • Seconds to Minutes Calculator
    Convert seconds to minutes instantly. Enter any number of seconds and get the exact minutes (seconds ÷ 60) plus a minutes-and-seconds breakdown.
  • Days to Hours Calculator
    Convert days to hours instantly with this free Days to Hours Calculator. Enter any number of days and get the exact total hours using hours = days × 24.
  • Weeks to Days Calculator
    Convert weeks to days instantly. Enter any number of weeks and get the exact equivalent in days using the formula days = weeks × 7.
  • Bedtime Calculator
    Find the best time to go to bed for your wake-up time. Calculates bedtimes based on 90-minute sleep cycles plus time to fall asleep.
  • Days From a Date Calculator
    Add or subtract any number of days from a date. Find the exact resulting calendar date and day of the week, with leap years handled automatically.
  • How Far Along Am I? Weeks Pregnant from Due Date
    Find out how many weeks and days pregnant you are from your due date. Enter your due date and today's date to get your gestational age instantly.
  • 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.
  • Speech Time Calculator
    Convert word count to speaking time. Estimate how many minutes your speech or presentation will take at your chosen words-per-minute pace.
  • PTO Accrual Calculator
    Calculate accrued PTO (paid time off) from hours worked, hours per full period, and PTO earned per period. Get hours, days, and accrual rate.
  • Horse Age Calculator
    Convert your horse's age into human years instantly. Uses the standard 12/7/2.5 horse-to-human age formula for a quick, accurate estimate.
  • Kitten Age Calculator
    Estimate a kitten's age in weeks and months from its weight. Uses the vet rule of thumb of about 1 pound per month for the first 6 months.
  • Daylight Remaining for Hike Calculator
    Find out how much daylight is left before sunset and whether you'll finish your hike before dark. Compare daylight to your estimated hike time instantly.
  • Layover / Connection Time Calculator
    Calculate your flight layover or connection time in minutes between arrival and next departure, and check if it beats the minimum connection time.
  • Jet Lag Recovery Time Calculator
    Estimate how many days you need to recover from jet lag based on time zones crossed and travel direction (eastward vs westward).
  • Time Zone Difference Calculator
    Find the hour difference between two time zones. Enter each city's UTC offset to see how many hours apart they are, plus the signed direction.
  • Add or Subtract Days Calculator
    Add or subtract any number of days from a date. Get the exact resulting calendar date and day of the week using precise Julian Day Number math.
  • Days Until Calculator
    Count the days until any future date, or days since a past date. Free countdown calculator showing days and weeks remaining to your target.
  • Hours Worked Calculator
    Free hours worked calculator. Enter clock in and clock out times plus break minutes to get total hours worked in decimal and hours-and-minutes format.
  • Day of the Week Calculator
    Find out what day of the week any date falls on using Zeller's congruence. Enter year, month and day to get the weekday instantly.
  • Chronological Age Calculator
    Calculate exact chronological age in years, months and days between a birthdate and any as-of date, plus total months, weeks and days.
  • Countdown to Payday Calculator
    Find out how many days and weeks until your next payday. Enter your pay day of the month and today's date to count down to getting paid.
  • Working Hours Between Two Times Calculator
    Calculate net working hours between a start and end time, deducting break minutes. Supports overnight shifts and shows hours and minutes.

Categories