Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Entered estimates only; contingency applies to work, not breaks. No automatic prediction of task difficulty.
Example Calculation
- Task durations in minutes: 30,45,20
- Breaks: 2
- Minutes per break: 5 min
- Work contingency: 20 %
Tasks 30,45,20 minutes with 20% contingency and two five-minute breaks total 124 minutes.
Frequently asked questions
How do I use this calculator?
Enter task durations in minutes, breaks, minutes per break, work contingency. The result updates automatically. Use Reset to restore the example values.
What method does it use?
total=Σtask minutes × (1+contingency)+break count × break duration.. Entered estimates only; contingency applies to work, not breaks. No automatic prediction of task difficulty.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.