Method
Multiplies task quantities by optimistic, typical, and cautious minutes, then applies a buffer and daily capacity.
Numbers / browser toolProject Time
Project Time
Estimate Calculator
Estimate a project range from task quantities, durations, and a buffer.
Compare optimistic, typical, and cautious workday scenarios.
Your inputs stay on your device
Project Time Estimate
live result%
Optional; enter 0 to hide workdays.
hoursOptimistic Minutes
Typical Minutes
Cautious Minutes
Estimated Workdays
Buffer Percent
This is an assumptions-based estimate, not a delivery guarantee.
Context & Reference
How it works
For planning a project from repeated tasks and uncertain durations.
calculator guideHow to use it
Use this calculator with your own values, then review the clearly labelled result and copy it when you need it elsewhere.
Understand the result
Three planning ranges are shown in hours and workdays.
Example
Estimate research plus 20 repeated items with a 15% buffer.
Practical tip
Ranges are assumptions, not delivery promises, staffing recommendations, or contracts.
Notes
This calculator runs locally in this browser. Ranges are assumptions, not delivery promises, staffing recommendations, or contracts.
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