How do I calculate the time between two times?

Use the Time Duration Calculator for elapsed time between two times or dates. 9:00 AM to 5:00 PM is 8 hours, and 10:00 PM to 6:00 AM is 8 hours overnight. This page adds or subtracts a duration from a clock time.

How do I add hours and minutes?

Use Add / subtract durations for 2h 45m + 1h 30m = 4h 15m. Use Add / subtract time to move a clock, such as 9:15 AM + 2h 30m = 11:45 AM.

How do I subtract time?

On a clock, 12:00 AM − 2 hours is 10:00 PM the previous day. On durations, 8h 30m − 45m is 7h 45m.

How do I calculate hours worked?

Time between gives raw elapsed time. For unpaid breaks or a timesheet, use the hours calculator or the work hours calculator.

How do I calculate time across midnight?

If the end clock is earlier than the start and you did not set dates, the tool adds 24 hours and labels the result overnight.

How do I convert time to decimal hours?

Decimal hours = total minutes ÷ 60. 2 hours 45 minutes is 2.75. The result card shows this next to hours and minutes.

What is the difference between a clock time and a duration?

A clock time is a point (3:30 PM). A duration is a length (2 hours 45 minutes). Adding durations stays a duration. Adding a duration to a clock returns a clock.

Does this calculator use 12-hour and 24-hour time?

Yes. Switch formats at the top. 2:30 PM and 14:30 are the same instant.

Can I ask what time it will be in a few hours?

Yes. In Add / subtract time, check use current browser time, then add the duration. Date rollover is shown when you pass midnight.

Is this a timezone or date calculator?

No. Use the time zone converter for cities and the date calculator for days, weeks, months, or years.

Time Calculator

Add or subtract hours and minutes from a clock time, or total a list of durations. For the elapsed time between two times or dates, use the Time Duration Calculator.

How do I add or subtract time?

Add a duration to a clock time, or total a list of durations. Elapsed time between two times — 9:00 AM to 5:00 PM is 8 hours, and 10:00 PM to 6:00 AM crosses midnight — belongs on the time duration calculator. For decimal hours only, use the hours calculator. For unpaid breaks, use the work hours calculator.

How to Use the Time Calculator

Choose Time between, Add / subtract time, or Add / subtract durations.
Pick 12-hour AM/PM or 24-hour format. Switching keeps the same clock time.
Enter the times or duration rows. Click an example to load a worked case.
Read hours and minutes, plus total minutes, seconds, and decimal hours.

Elapsed time belongs on the Time Duration Calculator

Hours between 9 AM and 5 PM, minutes between two clocks, and overnight spans such as 10:00 PM to 6:00 AM are answered on the time duration calculator. This page still includes a Time between mode, but it is built to add or subtract hours and minutes and to total a list of durations.

Add or Subtract Hours and Minutes

Add a duration to a clock time to answer “what time will it be after X hours?” 11:30 PM + 2 hours is 1:30 AM the next day. 12:00 AM − 2 hours is 10:00 PM the previous day. Turn on current browser time to ask what time it will be in 1 hour 30 minutes, or what time it was 5 hours ago. Calendar-day math (add 14 days to a date) belongs on the date calculator. City-to-city clocks belong on the time zone converter.

Calculate Total Time and Duration

Add or subtract duration rows for clips, study blocks, or a stack of shifts. 75 minutes becomes 1 hour 15 minutes. 90 seconds becomes 1 minute 30 seconds. 24 hours + 2 hours 30 minutes is 26 hours 30 minutes. For a multi-employee week, use the employee hours tracker.

Time Calculator Examples

These rows use the same function as the calculator.

Worked time calculator examples
Example	Result
9:00 AM → 5:00 PM	8 hours
10:30 PM → 6:15 AM	7 hours 45 minutes
2h 45m + 1h 30m	4h 15m
8h 30m − 45m	7h 45m
9:15 AM + 2h 30m	11:45 AM
2h 45m as decimal hours	2.75

How Time Calculations Work

A clock time is a point on a 24-hour circle. A duration is a length. Adding two durations stays a duration. Adding a duration to a clock time returns a new clock time and, if needed, a next-day or previous-day note. Minutes are not decimals: 2.45 hours is not 2 hours 45 minutes.

Time Calculation Formula

Elapsed = end − start. If end < start, elapsed = end + 24h − start.
Total seconds = (days × 86400) + (hours × 3600) + (minutes × 60) + seconds
Decimal hours = total minutes ÷ 60. 2 hours 45 minutes = 2.75 hours.
12:00 AM is midnight (00:00). 12:00 PM is noon.

Common Time Calculation Mistakes

Treating 2.75 as 2 hours 75 minutes instead of 2 hours 45 minutes.
Forgetting that 60 minutes make an hour when you add 45 + 30.
Ignoring midnight on an overnight shift.
Mixing 12-hour and 24-hour values in the same row.
Calling 12 AM noon. 12 AM is midnight; 12 PM is noon.
Skipping unpaid breaks when you meant net hours worked.

Time Calculator Use Cases

Use this hub for “how long between 9 and 5,” adding 2 hours to 9 PM, totaling clip lengths, or converting a duration to decimal hours. Keep payroll rules, break deductions, and multi-day timesheets on the hours and work-hours tools. Keep timezone meetings on the converter.

Frequently Asked Questions

How do I calculate the time between two times?: Use the Time Duration Calculator for elapsed time between two times or dates. 9:00 AM to 5:00 PM is 8 hours, and 10:00 PM to 6:00 AM is 8 hours overnight. This page adds or subtracts a duration from a clock time.
How do I add hours and minutes?: Use Add / subtract durations for 2h 45m + 1h 30m = 4h 15m. Use Add / subtract time to move a clock, such as 9:15 AM + 2h 30m = 11:45 AM.
How do I subtract time?: On a clock, 12:00 AM − 2 hours is 10:00 PM the previous day. On durations, 8h 30m − 45m is 7h 45m.
How do I calculate hours worked?: Time between gives raw elapsed time. For unpaid breaks or a timesheet, use the hours calculator or the work hours calculator.
How do I calculate time across midnight?: If the end clock is earlier than the start and you did not set dates, the tool adds 24 hours and labels the result overnight.
How do I convert time to decimal hours?: Decimal hours = total minutes ÷ 60. 2 hours 45 minutes is 2.75. The result card shows this next to hours and minutes.
What is the difference between a clock time and a duration?: A clock time is a point (3:30 PM). A duration is a length (2 hours 45 minutes). Adding durations stays a duration. Adding a duration to a clock returns a clock.
Does this calculator use 12-hour and 24-hour time?: Yes. Switch formats at the top. 2:30 PM and 14:30 are the same instant.
Can I ask what time it will be in a few hours?: Yes. In Add / subtract time, check use current browser time, then add the duration. Date rollover is shown when you pass midnight.
Is this a timezone or date calculator?: No. Use the time zone converter for cities and the date calculator for days, weeks, months, or years.

Time calculator