Use this building schedule project duration calculator to turn operational assumptions into a clear planning estimate. Enter the measurements from your project, field, or greenhouse, then review the main result alongside the supporting totals. The calculator keeps the formula visible so you can check units, compare scenarios, and understand exactly which assumptions drive the answer.
This is a production-based duration estimate. It does not automatically model task dependencies, inspections, weather, or access constraints.
Only count crews as parallel when they can work without blocking each other.
For 2,400 units, two crews at 120 units per day need 10 base workdays. A 10% contingency produces 11 workdays, or 2.2 five-day workweeks.
The result changes directly with the quantities in the formula. Change one field at a time to see which operating assumption has the largest effect on days.
Use the units printed beside each field. Convert measurements before entering them when a different unit is shown, because the built-in constants assume the displayed units.
Run separate scenarios for each period or operating condition, then add the applicable totals. A single blended input can hide important peaks and delays.
No. It includes only the losses, efficiency factors, or allowances shown in the input panel. Add separate allowances for conditions not represented.
Actual performance can differ because of measurement error, weather, equipment condition, work sequencing, material variability, and the quality of the assumptions entered.
| Input | Unit |
|---|---|
| Crew output | Units per crew-day |
| Contingency | Percent of base duration |