Most construction delays aren't caused by material shortages or design changes.

They're caused by wrong manpower planning.

I've seen projects fall behind schedule because no one properly calculated how many workers were actually needed per activity.

So I put together a step-by-step tutorial on how to calculate manpower for each activity on your project.

Here's the core logic:

→ Define the activity scope and quantity of work

→ Identify the productivity rate per crew per day

→ Calculate the required crew days

→ Match against your activity duration to get your daily headcount

→ Adjust for calendar, shifts, and efficiency factors

It sounds straightforward — but most site teams skip the productivity rate step entirely, and that's where the gap between plan and reality starts.

If you're a project manager, planning engineer, or site engineer managing multiple activities in parallel, getting this right is non-negotiable.