This free time calculator adds and subtracts hours and minutes, finds the time between two clock times, converts hours and minutes to decimal hours and totals a whole list of times. Add 2:30 to 9:45 and it answers 12:15, with the working shown line by line, so you can check homework, a time sheet or a travel plan.
Quick answer: to add hours and minutes, add the hours, add the minutes, then turn every 60 minutes into 1 hour. 9:45 + 2:30 gives 11 hours and 75 minutes, which is 12:15. To subtract time, borrow 1 hour (60 minutes) when the minutes on top are smaller: 15:20 − 9:45 = 5:35.
How to use the time calculator
- Choose what you need in the first row: Add or subtract, Time between two times, Decimal hours or Add a list.
- Type the times. Use h:mm such as 9:45, or h:mm:ss when you need seconds. Add am or pm when the first number is a time of day.
- The answer, the decimal hours and the total minutes update as you type. Open How it works for the steps.
- Press Copy result or Copy link to share the answer.
| Mode | You type | You get |
|---|---|---|
| Add or subtract | A time or duration, add, subtract, multiply or divide, then a second amount | The total as h:mm, decimal hours, total minutes and the clock time it lands on |
| Time between two times | A start time, an end time and an unpaid break in minutes | Time worked, decimal hours, and a note if the span crosses midnight |
| Decimal hours | Hours and minutes, or decimal hours | The conversion in either direction, plus a quick minutes chart |
| Add a list | One time per line, such as a week of hours | The running total, the grand total and the average per line |
Time calculator examples and a printable time chart
The cards below add hours and minutes, find an elapsed time across noon and turn a number of minutes into hours and minutes. The printable chart converts every hour between 12-hour and 24-hour time and lists common minutes as decimal hours for time sheets.
How to add hours and minutes
To add hours and minutes by hand, add the hours and the minutes separately, then carry every full 60 minutes into the hours. For 9:45 + 2:30, the hours give 9 + 2 = 11 and the minutes give 45 + 30 = 75. Since 75 minutes is 1 hour 15 minutes, the total is 12 hours 15 minutes. Start a 2 hour 30 minute task at 9:45 am and you finish at 12:15 pm.
The add time mode keeps the minutes between 0 and 59 for you, so you never end up with an answer like 11:75. These sums show the carrying step in action.
| First time | Add | Total minutes | Answer (h:mm) |
|---|---|---|---|
| 9:45 | 2:30 | 735 min | 12:15 |
| 1:50 | 2:20 | 250 min | 4:10 |
| 7:35 | 3:40 | 675 min | 11:15 |
| 0:45 | 0:50 | 95 min | 1:35 |
| 12:40 | 0:50 | 810 min | 13:30 |
| 23:15 | 1:45 | 1500 min | 25:00 |
| 36:30 | 14:45 | 3075 min | 51:15 |
Add hours and minutes on a calculator or in Excel
A phone calculator treats 2.30 as a decimal, not as 2 hours 30 minutes, so convert first: 2:30 is 2.5 hours. In Excel or Google Sheets, type each time as 9:45 and 2:30, add them with =A1+B1, and format the cell as [h]:mm so totals above 24 hours do not wrap back to zero.
How to subtract time
To subtract time, take the minutes from the minutes and the hours from the hours. When the minutes on top are smaller, borrow one hour and add 60 minutes. For 15:20 − 9:45, 20 minutes is less than 45, so 15:20 becomes 14:80. Then 80 − 45 = 35 minutes and 14 − 9 = 5 hours, so the answer is 5:35.
If the second time is bigger than the first, the answer is negative and the calculator shows a minus sign. 1:30 − 2:00 is −0:30, which on a clock is 11:30 pm the day before.
| Start | Subtract | Answer (h:mm) |
|---|---|---|
| 15:20 | 9:45 | 5:35 |
| 10:05 | 7:50 | 2:15 |
| 8:00 | 3:25 | 4:35 |
| 12:15 | 0:50 | 11:25 |
| 5:10 | 1:35 | 3:35 |
| 2:00 | 1:01 | 0:59 |
Elapsed time calculator: time between two times
Elapsed time is how long passes between a start and an end. Write both times on the 24-hour clock and subtract the start from the end. From 9:45 am to 3:20 pm, that is 15:20 − 9:45 = 5 hours 35 minutes. The 24-hour form removes the am and pm confusion: 1 pm is 13:00, 6 pm is 18:00 and 11 pm is 23:00. The elapsed time calculator mode also accepts am and pm directly, and it handles spans that cross midnight by adding 24 hours to the end time.
Another classroom method counts up in jumps. From 9:45 to 10:00 is 15 minutes, from 10:00 to 3:00 pm is 5 hours, and from 3:00 to 3:20 is 20 minutes. Add them: 15 + 20 minutes plus 5 hours is 5:35, the same answer.
Time between two times with a lunch break
For a work day, subtract the unpaid break after finding the time between the start and the end. This is how the time calculator with lunch break works: 9:00 am to 5:30 pm is 8:30, minus a 30 minute break is 8:00. The table shows more shifts, with the decimal hours that payroll uses.
| Start | End | Break | Time worked | Decimal hours |
|---|---|---|---|---|
| 9:00 am | 5:30 pm | 30 min | 8:00 | 8 |
| 8:15 am | 4:45 pm | 0 min | 8:30 | 8.5 |
| 7:00 am | 3:30 pm | 45 min | 7:45 | 7.75 |
| 10:30 pm | 6:15 am | 0 min | 7:45 | 7.75 |
| 6:50 pm | 11:20 pm | 0 min | 4:30 | 4.5 |
If you track hours for pay, the work hours calculator totals a whole week with breaks, and the date calculator adds days and weeks to a calendar date.
Hours to decimal: convert hours and minutes
Time sheets and pay calculations often use decimal hours, where the minutes are divided by 60. 15 minutes is 0.25 hours, 30 minutes is 0.5 and 45 minutes is 0.75, so 7 hours 45 minutes is 7.75 hours. Do not mix up 7:45 with 7.45 hours: 7.45 hours is only 7 hours 27 minutes. To convert the other way, multiply the decimal part by 60.
| Minutes | Decimal hours | Minutes | Decimal hours |
|---|---|---|---|
| 5 min | 0.0833 | 35 min | 0.5833 |
| 10 min | 0.1667 | 40 min | 0.6667 |
| 15 min | 0.25 | 45 min | 0.75 |
| 20 min | 0.3333 | 50 min | 0.8333 |
| 25 min | 0.4167 | 55 min | 0.9167 |
| 30 min | 0.5 | 60 min | 1 |
For example, 7 hours 45 minutes at $22.50 an hour is 7.75 × 22.50 = $174.38. In the United States, the federal rule on rounding time (29 CFR 785.48) says employers may record start and stop times to the nearest 5 minutes, one-tenth of an hour or quarter of an hour, as long as it averages out so employees are fully paid. Use the overtime calculator or the hourly to salary calculator for the pay step.
Multiply and divide time
The calculator can also multiply a time by a number or divide it. Practice 25 minutes a day for 7 days is 25 × 7 = 175 minutes, or 2:55. Splitting a 4:30 task between 3 people gives 4:30 ÷ 3 = 1:30 each. Under the hood it works in seconds, then converts back to hours, minutes and seconds. Useful for lap times, batch cooking, a study plan repeated every day or a task that repeats across a week.
| Time | Operation | Answer |
|---|---|---|
| 0:25 | × 7 | 2:55 |
| 1:20 | × 3 | 4:00 |
| 0:45 | × 8 | 6:00 |
| 4:30 | ÷ 3 | 1:30 |
| 1:20 | ÷ 4 | 0:20 |
| 2:10 | ÷ 5 | 0:26 |
Add a list of times: time sheet totals
To total a week, choose Add a list and type one time per line. Five days of 7:45, 8:15, 6:30, 7:50 and 5:20 add up to 35:40, which is 35.67 decimal hours, with an average of 7:08 a day. A line that starts with a minus sign is subtracted, so you can take off a break or an unpaid day.
A worked time sheet for one week
Here is a full week as the add a list mode would total it. Each day is the time between the start and the end, minus a 30 minute unpaid lunch. At $22.50 an hour, the week is 39 hours, or $877.50.
| Day | Start | End | Time worked | Decimal hours | Running total |
|---|---|---|---|---|---|
| Monday | 8:30 | 17:00 | 8:00 | 8 | 8:00 |
| Tuesday | 8:30 | 17:15 | 8:15 | 8.25 | 16:15 |
| Wednesday | 9:00 | 17:45 | 8:15 | 8.25 | 24:30 |
| Thursday | 8:15 | 16:45 | 8:00 | 8 | 32:30 |
| Friday | 8:30 | 15:30 | 6:30 | 6.5 | 39:00 |
Time units and conversions
These are the exact relationships behind every answer on this page. For other measurement units, use the unit converter.
| Unit | In minutes | In seconds |
|---|---|---|
| 1 hour | 60 | 3,600 |
| 1 day (24 hours) | 1,440 | 86,400 |
| 1 week (7 days) | 10,080 | 604,800 |
| A 365-day year | 525,600 | 31,536,000 |
12-hour and 24-hour clock conversion
Add am or pm to a clock time and the calculator reads it as a time of day. The table converts every hour between the two systems. Midnight is 12:00 am (00:00) and noon is 12:00 pm.
| Morning | 24-hour | Afternoon and night | 24-hour |
|---|---|---|---|
| 12:00 am | 00:00 | 12:00 pm | 12:00 |
| 1:00 am | 01:00 | 1:00 pm | 13:00 |
| 2:00 am | 02:00 | 2:00 pm | 14:00 |
| 3:00 am | 03:00 | 3:00 pm | 15:00 |
| 4:00 am | 04:00 | 4:00 pm | 16:00 |
| 5:00 am | 05:00 | 5:00 pm | 17:00 |
| 6:00 am | 06:00 | 6:00 pm | 18:00 |
| 7:00 am | 07:00 | 7:00 pm | 19:00 |
| 8:00 am | 08:00 | 8:00 pm | 20:00 |
| 9:00 am | 09:00 | 9:00 pm | 21:00 |
| 10:00 am | 10:00 | 10:00 pm | 22:00 |
| 11:00 am | 11:00 | 11:00 pm | 23:00 |
Time notation in the United States, Canada, the UK and Australia
- United States and English Canada: people say and write times on the 12-hour clock with am and pm; timetables, healthcare and the military use the 24-hour clock.
- United Kingdom, Ireland, Australia and New Zealand: both systems are common, and the 24-hour clock is standard on timetables.
- Quebec and much of continental Europe: the 24-hour clock is more widely used in everyday writing.
This summary follows the Wikipedia articles on the 12-hour clock and the 24-hour clock. The calculator does not adjust for time zones or daylight saving time: use the time zone converter when two places are involved.
Elapsed time word problems to try
Teachers often set elapsed time as a story. Solve each one by hand, then use the time calculator to check the answer and the steps.
- School starts at 8:15 am and ends at 3:05 pm. How long is the school day? Answer: 6 hours 50 minutes.
- A movie starts at 6:40 pm and lasts 2 hours 25 minutes. When does it end? Answer: 9:05 pm.
- A bus leaves at 11:50 am and the trip takes 3 hours 35 minutes. What time does it arrive? Answer: 3:25 pm.
- Practice lasted from 4:20 pm to 5:55 pm. How many minutes is that? Answer: 95 minutes.
Time calculator tips and common mistakes
| Mistake | Why it is wrong | Correct |
|---|---|---|
| Typing 9:5 for 9:05 | Minutes need two digits, and 9:5 is ambiguous | 9:05 |
| Reading 7.45 hours as 7:45 | Decimal hours use hundredths of an hour, not minutes | 7.45 h = 7:27 |
| Adding 45 + 30 = 75 and stopping | 75 minutes is more than an hour | 75 min = 1:15 |
| Subtracting without borrowing | 20 − 45 is negative, so take 1 hour from the hours | 14:80 − 9:45 |
| Forgetting midnight | A shift from 10 pm to 6 am ends the next day | Add 24:00 to the end time |
Everyday uses for a time calculator
- Cooking: a roast that needs 2:45 and goes in at 4:30 pm comes out at 7:15 pm.
- Travel: a flight that leaves at 9:50 pm and takes 3:25 lands at 1:15 am the next day, in the time of the place you left.
- Work and study: total the hours on a time sheet or the minutes of homework in a week.
- School: elapsed time is part of grade 3 and grade 4 measurement; practice with the free elapsed time worksheets and plan the day with a daily planner.
Questions people ask about the time calculator
How do I add 2 hours and 45 minutes to a time?
Type the start time with am or pm, choose Add and type 2:45. If you start at 4:30 pm, the answer is 7:15 pm: 4:30 + 2:45 = 6:75, which carries to 7:15.
How do I calculate time between two times?
Use the Time between two times mode, or write both times on the 24-hour clock and subtract the earlier from the later. 17:10 − 8:25 = 8:45.
Does the time calculator work with minutes and seconds?
Yes. Type h:mm:ss, such as 1:15:30, and the answer includes seconds. 1:15:30 + 0:45:45 = 2:01:15. The seconds are also converted to total seconds.
How do I convert minutes to decimal hours?
Divide the minutes by 60. 20 minutes is 20 ÷ 60 = 0.333 hours, so 3 hours 20 minutes is 3.333 hours.
Time calculator: frequently asked questions
How do I add hours and minutes together?
Add the hours, add the minutes, then turn every 60 minutes into 1 extra hour. 3:50 + 2:35 is 5 hours and 85 minutes, which is 6:25.
How do I subtract time?
Subtract the minutes, and borrow 1 hour (60 minutes) from the hours if the minutes on top are smaller. 10:05 − 7:50 is 2:15.
Can I add more than 24 hours?
Yes. Durations can be up to 99,999 hours, so 30:00 + 20:00 = 50:00. The result also shows days, hours and minutes, which is 2 days 2 hours here.
Why does the answer show am and pm?
So you can read a result as a time of day as well as a length of time. 12:15 as a duration is also 12:15 pm on a clock.
How do I find the time between two dates?
This calculator works on times of day and durations. For whole days, weeks or months between calendar dates, use the date calculator or the days between dates calculator.
Can I use am and pm, or only 24-hour time?
Both work. Type 3:20 pm or 15:20, and the calculator reads them the same way.
How do I add up hours on a time sheet?
Choose Add a list and type one time per line. The total, the decimal hours and the average per line appear together.
How many minutes are in 1.75 hours?
The answer is 105 minutes. 1.75 × 60 = 105, which is 1 hour 45 minutes.
Does the time calculator adjust for time zones or daylight saving?
No. It adds and subtracts clock time only. Use the time zone converter when two locations are involved.
Is the time calculator free?
Yes. It is free, needs no sign-up and runs in your browser, so nothing you type is sent anywhere.
Related calculators
- Work hours calculator: a full week with breaks
- Date calculator: add or subtract days, weeks and months
- Days between dates calculator
- Time zone converter
- Unit converter: hours, minutes, seconds, days and weeks
- All calculators
Sources and further reading
- Wikipedia: 24-hour clock
- Wikipedia: 12-hour clock
- Legal Information Institute: 29 CFR 785.48, Rounding practices
- NIST: Time and Frequency Division
Last updated: October 2026.