All Calculators
Every time and hours tool on the site, in one place. All free, instant, and no signup.
Hours in a…
Hours in a Day
24 hours, 1,440 minutes, 86,400 seconds
Converting a day into smaller units, or checking how a 23- or 25-hour daylight saving day changes the count.
Hours in a Week
168 calendar hours, 40 work hours
Budgeting a week, since sleep and work both come out of the same 168 hours.
Hours in a Month
672–744 by month; 730.5 average
Monthly billing or server uptime, where a 28-day February and a 31-day March give different totals.
Hours in a Year
8,760 regular, 8,784 leap
Annual totals such as energy use per year or how many hours a machine runs if it never stops.
Hours in a Work Year
2,080 standard; salary & PTO
Turning an annual salary into an hourly rate, with or without holidays and paid time off taken out, or an hourly rate back into a salary.
Time & date tools
Work Hours Calculator
Hours between two times, minus breaks
Filling in a timesheet: enter clock-in and clock-out, subtract lunch, get decimal hours.
Time From Now
What time will it be in X hours/minutes
Knowing what the clock will say when a 36-hour shipping window closes.
Time Ago
What time it was X hours ago
Working backward from now, for example to find when a log entry stamped "9 hours ago" happened.
Days Until (Countdown)
Live countdown to any date
Counting down to a trip or a deadline, down to the second.
Date Calculator
Add/subtract dates; days between dates
Finding the date 90 days from a start date, or the number of days between two dates.
Time Unit Converter
Convert seconds, minutes, hours, days…
Straight unit conversion, such as 2.75 hours to minutes or 500,000 seconds to days.
Quick reference
The standard figures, so you may not need a calculator at all. Each row links to the page that explains it.
Which calculator do I need?
If your question starts with “how many hours in…”, use one of the five “Hours in a…” pages. They are fixed answers with the math shown and the edge cases, such as leap years.
If you have two clock times and want the gap between them, use the Work Hours Calculator. If you have two dates, use the Date Calculator.
If you want the time a set number of hours before or after now, pick by direction: Time From Now goes forward (hours and minutes), Time Ago goes back (1 to 24 hours). For a running countdown to a fixed date, use Days Until.