# Time Calculator | Add, Subtract, Multiply, Divide Time

## Calculator Use

Time calculator to add, subtract, multiply and divide time in days, hours, minutes and seconds.

Use this time calculator to:

- Add Time
- Subtract Time
- Multiply Time by a Number
- Divide Time by a Number
- Divide Time by Time

The calculator can add and subtract time segments or multiply and divide time by a number or decimal. Answers include equivalent time in total days, hours, minutes or seconds. Also divide a time by a time and the answer includes the quotient as an integer with the remainder in time units.

## How to Calculate Time

How to do math operations with time is explained below. See examples of adding, subtracting, multiplying and dividing segments of time.

### How to Add Time

Add days, hours, minutes and seconds working from smallest unit of time to largest.

- Add the seconds
- If total seconds is greater than 59, subtract 60 from seconds and carry 1 to minutes
- Add the minutes including any carried over from calculating seconds
- If total minutes is greater than 59, subtract 60 from minutes and carry 1 to hours
- Add the hours including any carried over from calculating minutes
- If total hours is greater than 24, subtract 24 from hours and carry 1 to days
- Add the days including any carried over from calculating hours

#### Adding Time Example Problem

Add 2 days 21 hours 45 minutes 39 seconds to 5 days 10 hours 45 minutes 22 seconds

- 39 seconds + 22 seconds = 61 seconds

- 61 seconds - 60 = 1 second, carry 1 to minutes
- 1 minute + 45 minutes + 45 minutes = 91 minutes

- 91 minutes - 60 = 31 minutes, carry 1 to hours
- 1 hour + 21 hours + 10 hours = 32 hours

- 32 hours - 24 = 8 hours, carry 1 to days
- 1 day + 2 days + 5 days = 8 days

- Completed Adding Time Math Problem

### How to Subtract Time

Subtract days, hours, minutes and seconds working from smallest unit of time to largest.

- Subtract the seconds
- If the seconds you are subtracting is greater than the top number, borrow 1 minute from the top minutes and add 60 to the top seconds. Then subtract.
- Subtract the minutes
- If the minutes you are subtracting is greater than the top number, borrow 1 hour from the top hours and add 60 to the top minutes. Then subtract.
- Subtract the hours
- If the hours you are subtracting is greater than the top number, borrow 1 day from the top days and add 24 to the top hours. Then subtract.
- Subtract the days

Note that in any case where you need to borrow, if the next highest unit is 0 then borrow from the 2nd highest unit. Just as you would in long subtraction, borrow from the next highest place value.

#### Subtracting Time Example Problem

Subtract 2 days 21 hours 56 minutes 18 seconds from 5 days 0 hours 10 minutes 13 seconds

- Subtract seconds
- 13 seconds is less than 18 seconds so borrow 1 from the top minutes
- 1 minute = 60 seconds so add 60 seconds to 13 to get 73
- 73 seconds - 18 seconds = 55 seconds

- Subtract minutes
- 9 minutes is less than 56 minutes so borrow 1 from hours
- There are 0 hours so borrow 1 from days
- 1 day = 24 hours and 1 hour = 60 minutes, so add 24 to hours, then borrow 1 from hours to leave 23
- Add 60 minutes to 9 to get 69
- 69 minutes - 56 minutes = 13 minutes

- Subtract hours
- 23 hours - 21 hours = 2 hours

- Subtract days
- 4 days - 2 days = 2 days

- Completed Subtracting Time Math Problem

### How to Multiply Time

Multiply days, hours, minutes and seconds by a multiple, working from smallest unit of time to largest.

- Multiply each unit of time by the multiple
- Working from smallest unit of time to largest, convert excess time units to next higher unit
- If seconds are greater than 59, divide by 60 to get a whole number and remainder
- Keep the remainder as total seconds and add the whole number to minutes
- If minutes are greater than 59, divide by 60 to get a whole number and remainder
- Keep the remainder as total minutes and add the whole number to hours
- If hours are greater than 23, divide by 24 to get a whole number and remainder
- Keep the remainder as total hours and add the whole number to days

#### Multiplying Time Example Problem

Multiply 2 days 10 hours 32 minutes 16 seconds by 5

- Multiply each unit of time by 5

- 80 seconds is greater than 59 so convert excess to minutes
- 80 divided by 60 equals 1 with a remainder of 20
- Keep 20 seconds and carry the 1 to minutes
- 160 + 1 = 161 minutes

- 161 minutes is greater than 59 so convert excess to hours
- 161 divided by 60 equals 2 with a remainder of 41
- Keep 41 seconds and carry the 2 to hours
- 50 + 2 = 52 hours

- 52 hours is greater than 24 so convert excess to days
- 52 divided by 24 equals 2 with a remainder of 4
- Keep 4 hours and carry the 2 to days
- 10 + 2 = 12 days

- Completed Multiplying Time Math Problem

### How to Divide Time

Divide days, hours, minutes and seconds by a divisor, working from smallest unit of time to largest.

- Divide each unit of time by the divisor
- Then, working from largest to smallest unit of time, convert any decimal values to whole numbers shifting the decimal amount to a smaller time unit
- If days has a decimal, keep the whole number as total days and convert the decimal to hours
- Since 1 day = 24 hours, multiply the decimal by 24 and add the result to hours
- If hours has a decimal, keep the whole number as total hours and convert the decimal to minutes
- Since 1 hour = 60 minutes, multiply the decimal by 60 and add the result to minutes
- If minutes has a decimal, keep the whole number as total minutes and convert the decimal to seconds
- Since 1 minute = 60 seconds, multiply the decimal by 60 and add the result to seconds
- If seconds has a decimal, you can usually leave this as your final answer depending on your application

#### Dividing Time Example Problem

Divide 4 days 10 hours 13 minutes 16 seconds by 4

- Divide each unit of time by 4

- Work from smallest unit of time to leargest convert any decimal values to whole numbers
- Hours is not a whole number so convert the decimal to minutes
- 2.5 hours is 2 hours plus 0.5 hours
- Since 1 hour = 60 minutes, 0.5 of 1 hour equals 0.5 of 60 minutes = 30 minutes
- Keep the 2 hours and carry 30 to minutes
- 30 + 3.25 = 33.25 minutes

- Minutes is not a whole number so convert the decimal to seconds
- 33.25 minutes is 33 minutes plus 0.25 minutes
- Since 1 minute = 60 seconds, 0.25 of 1 minute equals 0.25 of 60 seconds = 15 seconds
- Keep the 33 minutes and carry 15 to seconds
- 15 + 4 = 19 seconds

- Completed Dividing Time Math Problem