How the Activity Duration works
Duration = Quantity ÷ (Output per crew per day × Crews).
How to use this calculator
- Sign up free and verify your email to unlock the calculator.
- Choose Metric (m, mm, m³, kg) or Imperial (ft, in, cft, lb) units.
- Enter the quantity, output per crew/day, crews.
- Results update instantly — read the quantities in the Results panel.
- Add a wastage allowance and confirm against your drawings and specifications before ordering.
Typical uses
Building a construction schedule from productivity rates.
Assumptions & limitations
Results are planning estimates based on standard assumptions for project management work. They do not replace structural design, site measurement or project specifications. Material densities, wastage and mix proportions vary by region and supplier.
Frequently asked questions
- How does the Activity Duration work?
- Duration = Quantity ÷ (Output per crew per day × Crews).
- Can I use the Activity Duration in feet and inches?
- Yes. Switch to Imperial and enter feet, inches, square feet or pounds — the calculator converts automatically and shows results in imperial units.
- When should I use the Activity Duration?
- Building a construction schedule from productivity rates.
- Is this construction calculator free?
- Yes. All CM PRO construction calculators are free — you only need to sign up and verify your email.
Related searches: activity duration calculator, construction productivity, crew output.
