Duration Calculator

  • Weeks and Days Between Two Dates Calculator
    Find the number of weeks and days between two dates. Great for pregnancy tracking, project timelines, and counting elapsed time fast and accurately.
  • Hours Since a Time Calculator
    Calculate how many hours have passed since a past date and time. Instantly find the elapsed hours, days, and minutes from any moment until now.
  • Hours to Minutes Calculator
    Convert hours to minutes instantly. Enter any number of hours and get the exact equivalent in minutes using the formula minutes = hours × 60.
  • Seconds to HH:MM:SS Calculator
    Convert any number of seconds into hours, minutes, and seconds (HH:MM:SS) instantly. Free, accurate time conversion calculator.
  • Time Clock Calculator (Clock-In / Clock-Out)
    Free time clock calculator. Enter clock-in and clock-out times for each work period and get your Total Time in hours:minutes plus decimal hours.
  • Stopwatch Timer Calculator - Add & Subtract Lap Times
    Add or subtract stopwatch lap times in mm:ss.s like an adding machine. Keeps a running total that rolls into hours. Perfect for race splits and lap sums.
  • Day of the Week Calculator
    Find what day of the week any date falls on. Get the weekday name, day-of-year, days in the month and year, and which ordinal weekday it is.
  • Time Arithmetic Calculator
    Add, subtract, multiply, or divide spans of time in days, hours, minutes and seconds. Get a normalized result or a unitless time ratio instantly.
  • Date Difference Calculator
    Calculate the number of days or business days between two dates. Supports US, EU and ISO date formats, leap years, and optional Saturday counting.
  • Time Card Hours Calculator
    Free time card calculator: enter start and end times, deduct breaks, and get total hours worked as hh:mm, decimal hours, and minutes instantly.
  • Time Calculator hh:mm:ss (Add and Subtract Time)
    Adding-machine time calculator. Add and subtract hh:mm:ss values into a running total. Flexible separators (: . - space), negative times, zero-padded result.
  • Minutes to Hours Converter
    Convert minutes to hours instantly. Get hours-and-minutes, hh:mm clock format, and decimal hours from any number of minutes. Free, accurate, universal.
  • Minutes to Decimal Hours Converter
    Convert hours and minutes into decimal hours for time cards and payroll. Enter hours and minutes, choose decimals, and get hours in decimal form instantly.
  • Training Pace Calculator
    Turn a recent race time into easy, tempo, threshold and long-run training paces. Free running pace calculator showing seconds per km for each zone.
  • Running Split Calculator
    Calculate your per-split time and total finish time from your target running pace and distance. Plan even splits for races and training runs.
  • Weekday Count in Date Range Calculator
    Count how many Mondays through Sundays fall between two dates (inclusive), plus total days. Free weekday counter for shift planning and working-day counts.
  • Race Time Predictor Calculator
    Predict your race finish time at any distance using Riegel's formula. Enter a known time and distance to forecast 5K, 10K, half & full marathon times.
  • Marathon Pace Calculator
    Calculate your required marathon pace per mile and per kilometer from your goal finish time. Free, fast marathon pace calculator for runners.
  • Hiking Time Calculator
    Estimate how long a hike will take using Naismith's Rule: time from distance, walking speed, and total ascent. Free, instant trek planning tool.
  • Hours and Minutes Add/Subtract Calculator
    Add and subtract multiple time durations in hours and minutes, each repeatable a set number of times. Get the total as hours+minutes, decimal hours, and minutes.
  • Walking Time from Distance Calculator
    Convert a walking distance to minutes on foot using Japan's 80 m/min real-estate standard. Adjustable speed and units, precise to the second.
  • Walking Time to Distance Calculator
    Convert "X minutes on foot" from Japanese property listings into walking distance in meters and km, using the standard 80 m/min advertising rate.
  • Years to Decades Calculator
    Convert years to decades instantly. Enter any number of years and get the equivalent in decades using the simple formula decades = years ÷ 10.
  • Business Days Calculator
    Calculate the number of business (working) days between two dates. Excludes Saturdays, Sundays and a custom number of public holidays.

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