Quick answer
Divide project quantity by realistic daily production, round up to workdays and add separate allowances for mobilization, curing, inspections, weather and material delays.
Step by step
- Define the quantity Use the same unit as the production rate.
- Choose production rate Base it on crew size, access, preparation and actual conditions.
- Calculate workdays Quantity ÷ daily production, rounded up.
- Add non-production time Include setup, curing, inspections, weather and delivery risk.
Formula or rule of thumb
Example
Installing 800 ft² at 200 ft² per workday requires 4 production days before setup, delivery and contingency.
Common mistakes
Treating production rate as guaranteed, ignoring cure time, and adding weather days into the production rate and then adding them again.
Planning note: product yields, installation methods, site conditions and local requirements can change the final quantity. Use the exact manufacturer or supplier information before purchasing.
FAQ
Is this a contractor schedule?
No. It is a planning estimate.
Should curing count as workdays?
Curing may be calendar time even when no crew is working; list it separately.
Does crew size change duration?
Usually, but access and workflow can limit the benefit of adding workers.