# Time Calculator

An online calculator to add and subtract times given in hours, minutes and seconds (hh:mm:ss) form.

## Table of Conversion Used in Time Calculator

1 hour = 60 minutes

1 minute = 60 seconds.

1 hour = 3600 seconds

## Examples of Time Calculations

Example: The times T1 and T2 are given by T1 = 6 hours 34 minutes 56 seconds and T2 = 2 hours 51 minutes 45 seconds.

__Add times__

Let S = T1 + T2 = (6 hours 34 minutes 56 seconds) + (2 hours 51 minutes 45 seconds)

add hours together, minutes together and seconds together

S = (6 + 2) hours (34 + 51) minutes (56 + 45) seconds = 8 hours 85 minutes 101 seconds

We now need to convert 85 minutes to hours : 86 minutes = 1 hour 25 minutes and 101 seconds to minutes: 101 seconds = 1 minute 41 seconds; and substitute

S = 8 hours 85 minutes 101 seconds = 8 hours + (1 hour 25 minutes) + (1 minute 41 seconds) = 9 hours 26 minutes 41 seconds

__Subtract times__

With the subtraction, it might be easier to convert each time into seconds, subtract and convert again into hours, minutes and seconds.

T1 = 6 hours 34 minutes 56 seconds = 6 × 3600 seconds + 34 × 60 seconds + 56 seconds = 23696 seconds

T2 = 2 hours 51 minutes 45 seconds = 2 × 3600 seconds + 51 × 60 seconds + 45 seconds = 10305 seconds

Let D = T1 - T2 = 23696 seconds - 10305 seconds = 13391 seconds

Convert 13391 seconds into hours

D = 13391 seconds / 3600 = 3.71972222222 hours = 3 hours + 0.71972222222 × 60 minutes = 3 hours 43.1833333333 minutes = 3 hours 43 minutes 0.1833333333 × 60 seconds = 3 hours 43 minutes 11 seconds

## How to Use the Time Calculator

1 - Enter the times T1 and T2 in hours, minutes and seconds form, check your input and press "Add / Subtract". The outputs are the sum T1 + T2 and the difference T1 - T2 in two forms: hours, minutes, seconds and also in decimal hours.

Example of times T1 and T2

T1 = 6 hours 34 minutes 56 seconds

T2 = 2 hours 51 minutes 45 seconds

### More References and links

Convert time from decimal to Hours, Minutes and Seconds .Convert time from Hours, Minutes and Seconds to decimal .

Math Calculators and Solvers .