Site maths
Labour duration
- where
- worker-days
- items / work units
- work units per person-day
- team working days
- people
Explain this equation
Estimates how long a task will take from the amount of work, a realistic output rate and the size of the team.
U is the amount of work, in whatever unit suits: items, metres or square metres. r is how many of those units one person completes in a day. Dw is the total effort in worker-days. p is the number of people, and Dt is the elapsed working days for the team.
Dividing the work by the daily rate gives the total effort. Sharing that effort across p people divides the elapsed time by p, assuming everyone works at the same rate.
120 units at 40 per person-day is 3 worker-days; with two people that is 1.5 days.
Watch out: doubling the team rarely halves the time in practice. Access, setting out, drying times and weather all slow output.
Estimate working time using a realistic team rate.
Enter your values to see the result.
Good to know
Fractional days are retained. Access, complexity, curing, weather and preparation affect production. This is not a promised programme.
Sources
- Geometry / arithmetic
This is a calculation aid, not a structural design or compliance certificate. Every default is an example, not a specification for your project.