Time and Date

  • Sleep Cycle Calculator
    Free sleep cycle calculator. Find the best bedtime or wake-up time based on 90-minute sleep cycles plus the time it takes you to fall asleep.
  • Rule of 72 Doubling Time Calculator
    Use the Rule of 72 to estimate how many years it takes an investment to double at a given annual rate. Fast, free doubling time calculator.
  • Video Playback Speed Time Calculator
    Find out how long a video takes to watch at 1.25x, 1.5x, 2x or any speed. Enter the length and speed to see your watch time and time saved.
  • Years to Days Calculator
    Convert years to days instantly. Enter any number of years and get the equivalent days using the 365.25-day average year (accounts for leap years).
  • Weeks Between Dates Calculator
    Calculate the exact number of weeks and days between two dates. Enter a start and end date to get total weeks, remainder days, and decimal weeks.
  • How Many Hours Until a Time
    Find out how many hours and minutes are left until a target time of day. Wraps to the next day automatically if the time has already passed.
  • Weeks Pregnant Calculator
    Find out how many weeks pregnant you are today. Calculate gestational age in weeks and days from your last menstrual period (LMP) date.
  • Time Card Calculator with Lunch Break
    Free time card calculator with lunch break. Enter clock-in, clock-out and break minutes to get net worked hours instantly. Handles overnight shifts.
  • Days Ago Calculator
    Find out what date it was N days ago. Enter the number of days and get the exact past date, weekday, and ISO format instantly.
  • Hours and Minutes to Decimal Calculator
    Convert hours and minutes into decimal hours instantly. Enter time like 8h 30m to get 8.5 decimal hours for payroll, timesheets, and billing.
  • Days Until My Exam Calculator
    Count the days until your exam with this free study countdown. Enter your exam date to see days, weeks left, and total planned study hours.
  • Jet Lag Recovery Calculator
    Estimate how many days you need to recover from jet lag based on time zones crossed and travel direction (eastward vs westward).
  • Local Time to UTC Converter
    Convert a local time to UTC using any timezone offset. Enter the hour, minute, and UTC offset (e.g. -5 or +5.5) to get the equivalent Coordinated Universal Time.
  • Unix Timestamp to Local Time Converter
    Convert a Unix timestamp (epoch seconds) to a readable local date and time for any UTC offset. Get the date, time, and day of the week instantly.
  • 12-Hour to 24-Hour Time Converter
    Convert 12-hour AM/PM clock time to 24-hour military time instantly. Enter the hour, minute and AM or PM to get the exact 24-hour equivalent.
  • Weekly Overtime Calculator
    Calculate regular pay, overtime pay and total weekly earnings using the 40-hour threshold (US FLSA standard). Enter hours, rate and OT multiplier.
  • Salary to Hourly Wage Calculator
    Convert an annual salary to an hourly wage instantly. Enter your yearly pay, hours per week, and weeks per year to get hourly, daily, weekly, and monthly pay.
  • Pace Calculator
    Free pace calculator: enter your time and distance to find your running pace per mile or kilometer plus your average speed in mph or km/h.
  • UTC to BST Converter
    Convert UTC time to British Summer Time (BST) instantly. BST = UTC + 1 hour, used in the UK during daylight saving (late March to late October).
  • Decimal Time to Hours and Minutes Converter
    Convert decimal hours into hours and minutes instantly. Enter a value like 2.75 to get 2 hours 45 minutes — perfect for timesheets and payroll.
  • CET to EST Time Converter
    Convert Central European Time (CET) to Eastern Standard Time (EST) instantly. CET is 6 hours ahead of EST. Enter a CET time to get the EST equivalent.
  • UTC to KST Converter
    Convert UTC time to Korea Standard Time (KST) instantly. KST is UTC+9 with no daylight saving. Enter a UTC hour and minute to get the KST time.
  • UTC to AEST Converter
    Convert UTC to AEST (Australian Eastern Standard Time, UTC+10). Enter any UTC time and instantly get the equivalent AEST time with day rollover.
  • Baby Age in Weeks and Months Calculator
    Find your baby's age in weeks, days and whole months from their date of birth. Quick, accurate infant age calculator for any "as of" date.

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