Labour Days For Task Calculator

Work out labour days for task instantly with clear inputs, formula shown and shareable results.

About Labour Days For Task Calculator

Person days come from dividing the quantity by effective output per person per day. Calendar duration is then person days divided by crew size, so the same effort can be spent over a long thin programme or a short heavy one. Labour hours at eight per day feed cost and safety man-hour reporting.

Formula

Effort and duration

Person days = quantity / (output x efficiency); calendar days = person days / crew size

Worked example

With the default values below, Labour Days For Task Calculator returns Calendar days required of 5.56. Change any input above and every figure here is recalculated in your browser.

Inputs used

Quantity of workminimum 0.1 units: 200 units
Output per person per dayminimum 0.01 units: 8 units
Crew sizeminimum 1: 5
Efficiency factoraccepts 20–100 %: 90 %

Results

Calendar days required: 5.56 days
Person days of effort: 27.8 person·days
Total labour hours: 222.2 h
Crew output per day: 36.00 units

Step by step

1Values used
2Effort and duration
3Calendar days required= 5.56 days
4Person days of effort= 27.8 person·days
5Total labour hours= 222.2 h
6Crew output per day= 36.00 units

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Labour Days For Task figure worked out?

Person days = quantity / (output x efficiency); calendar days = person days / crew size. Person days come from dividing the quantity by effective output per person per day.

Why report labour hours separately?

Safety statistics such as lost time injury frequency rate are expressed per million man-hours, so the hours figure is needed regardless of how the cost is built up.

What values do I need to enter?

This calculator takes 4 inputs: Quantity of work, Output per person per day, Crew size, Efficiency factor. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.