Free Maths Calculator

Time Calculator

Work out the time between two clock times, add a duration on, multiply a duration, or take a percentage of one, such as the 25% extra time granted in exams. Every answer turns into minutes first, does the sum, then turns back, so nobody treats 2 hours 30 minutes as 2.3.

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    Worked Example

    A train leaves at 14:45 and arrives at 17:20. How long is the journey?

    1. Bridge to the next whole hour: 14:45 to 15:00 is 15 minutes
    2. Stride the whole hours: 15:00 to 17:00 is 2 hours
    3. Finish the minutes: 17:00 to 17:20 is 20 minutes
    4. Add the pieces: 2 hours 35 minutes

    Answer: 2 hours 35 minutes

    Try These Yourself

    A film starts at 19:40 and lasts 2 hours 25 minutes. When does it end?Show answerHide answer

    Answer: 22:05

    19:40 + 2 h = 21:40, then + 25 min.

    A lesson lasts 45 minutes. How long are 7 of them altogether?Show answerHide answer

    Answer: 5 hours 15 minutes

    45 × 7 = 315 minutes, and 315 minutes is 5 hours 15 minutes.

    A paper lasts 1 hour 30 minutes. How long is it with 25% extra time?Show answerHide answer

    Answer: 1 hour 52 minutes 30 seconds

    25% of 90 minutes is 22 minutes 30 seconds, added on.