Everyday math

Time duration calculator

Find the elapsed time between a start and end time.

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Your result

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Enter your numbers to see the answer.

Time duration calculator guide

What does this calculator help you figure out?

Find the elapsed time between a start and end time. This free online calculator is designed for people who need a quick, transparent estimate rather than a black-box answer. Enter start hour, start minute, end hour, end minute, review the assumptions, and adjust the values to match your project or situation.

How is the result calculated?

The duration is calculated by converting each time component to a common unit, then adding or subtracting.

Example and assumptions

For a useful first estimate, start with the sample values already shown in the calculator, then replace them with your own measurements or figures. Keep all dimensions in compatible units and round up where the result represents a quantity you must buy.

Results are planning estimates. Check the units, product coverage, carrier rules, or local rates before making a purchase or financial decision.

How it works

The method behind the number.

Find the elapsed time between a start and end time. This tool explains the calculation so you can adjust the assumptions to match your situation.

Your formula appears here after the calculator loads.

Common questions

Frequently asked questions

What does this time duration calculator calculate?

Find the elapsed time between a start and end time. The page shows the result, a breakdown, and the formula used so you can check the calculation.

What information do I need?

You will need start hour, start minute, end hour, end minute. The labels and units beside each field show what the calculator expects.

How accurate is the result?

Results are planning estimates. Check the units, product coverage, carrier rules, or local rates before making a purchase or financial decision. Accuracy depends on the quality of the inputs and the assumptions used by the underlying formula.