Free · Everyday planning calculators

Cumulative Duration Planner

Add up to twenty durations and show the running total at each selected step.

  • Formula & worked example
  • Private in your browser
  • No signup
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

Three thirty-minute activities take ninety minutes, or 1.5 hours.

Total through step n = sum of the first n durations

Worked example

Enter these known values and leave the other values blank.

Number of times to add together
3
Time 1
30 min
Time 2
30 min
Time 3
30 min
Total time
90 min

Assumptions and limitations

  • Input slots and cumulative outputs use minutes initially. Duration selectors support fixed unit conversions; values are elapsed durations rather than clock times or calendar dates.

Common questions

What does this estimate assume?

Input slots and cumulative outputs use minutes initially. Duration selectors support fixed unit conversions; values are elapsed durations rather than clock times or calendar dates.

Can I find a missing input?

Clear the unknown field and enter compatible known values. The controls retain supported inverse calculations, while rounded counts and one-way outputs stay directional.

References

Every duration slot is nonnegative, including slots hidden by the selected count. Zero-duration activities are allowed.

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