Site maths
Labour duration
- where
- worker-days
- units to lay
- rate (units per person-day)
- team-days
- number of people
Explain this equation
This gives a rough labour duration from the number of units to lay, a production rate and the size of the team.
U is the number of units to lay. r is the rate one person lays in a day. D_w is the total worker-days. p is the number of people, and D_t is the number of days the team takes.
Dividing the work by the daily rate gives the total effort in worker-days. Sharing that effort between p people gives the calendar working days, assuming everyone works at the same rate.
1200 bricks at 400 per person-day is 3 worker-days, or 1.5 days for two people. Doubling the team halves the days, in theory.
Watch out: access, weather, cutting, curing and preparation all slow production. Fractional days are kept, so round up as the job requires.
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
Estimates are not design approval or British Standards compliance checks. Structural arch, retaining-wall, wind, foundation, lintel and masonry-capacity design are not performed. Use the project engineer’s specification.