Absence Rates Project Budget Calculator Examples
Worked examples show how different labour shares, absence rates, coverage levels, and replacement premiums change a project budget.
These examples illustrate direct replacement-cover costs under different project staffing assumptions. They also show why uncovered work should be reviewed separately from the cash allowance added to the budget.
Moderate absence on a £500,000 project
A medium-sized project plans to use overtime and temporary staff for most, but not all, absence-affected work.
Input Summary
Planned project budget
£500,000
Labour share
50%
Absence rate
5%
Coverage rate
80%
Replacement premium
20%
Calculation Breakdown
- 1Labour budget£500,000 × 50%£250,000
- 2Affected labour£250,000 × 5%£12,500
- 3Replacement cost£12,500 × 80% × 1.20£12,000
- 4Adjusted budget£500,000 + £12,000£512,000
Result Summary
Adjusted budget
£512,000
Absence Rates Project Budget Calculator
The project includes a £12,000 replacement-cover allowance and has £2,500 of estimated uncovered work value.
High labour share with limited cover
A specialist team has limited access to suitably skilled replacement workers.
Input Summary
Planned project budget
£300,000
Labour share
70%
Absence rate
6%
Coverage rate
50%
Replacement premium
30%
Calculation Breakdown
- 1Labour budget£300,000 × 70%£210,000
- 2Affected labour£210,000 × 6%£12,600
- 3Replacement cost£12,600 × 50% × 1.30£8,190
- 4Adjusted budget£300,000 + £8,190£308,190
Result Summary
Adjusted budget
£308,190
Absence Rates Project Budget Calculator
The additional absence budget is £8,190, while £6,300 of work remains uncovered.
Lower-cost project with full cover
A short project uses a flexible staffing arrangement to maintain planned output.
Input Summary
Planned project budget
£120,000
Labour share
40%
Absence rate
3%
Coverage rate
100%
Replacement premium
15%
Calculation Breakdown
- 1Labour budget£120,000 × 40%£48,000
- 2Affected labour£48,000 × 3%£1,440
- 3Replacement cost£1,440 × 100% × 1.15£1,656
- 4Adjusted budget£120,000 + £1,656£121,656
Result Summary
Adjusted budget
£121,656
Absence Rates Project Budget Calculator
The estimated budget uplift is £1,656, or about 1.4% of the original project budget.
How to Read Your Results
The absence-adjusted budget includes the planned budget plus estimated replacement labour spending.
Additional absence budget and replacement labour cost are the same output in this calculation.
Uncovered work value is an exposure indicator, not an automatic extra budget cost.
A larger labour share or absence rate generally increases the potential impact.
Compare scenarios using consistent project periods and cost assumptions.
Assumptions & Important Notes
- All examples assume normal labour is already included in the original project budget.
- Percentages are applied to the planned labour budget, not to the entire budget unless labour share is 100%.
- Replacement cover is assumed to deliver work equivalent to the selected covered value.
- Figures are illustrative planning estimates rather than project forecasts.
Related Examples
Frequently Asked Questions
What happens if replacement coverage is 100%?
All absence-affected labour is assumed to be covered, so the uncovered work value is zero. The full premium-adjusted replacement cost is added to the budget.
Can a project have a low budget increase but high uncovered work value?
Yes. This can happen when the coverage rate is low, because less replacement labour is purchased.
Which input most affects the result?
The effect depends on the project, but labour share, absence rate, coverage rate, and replacement premium all directly affect the replacement cost.
Should the premium include agency fees?
It can, if those fees are part of the extra cost of obtaining replacement labour and are reflected consistently in the percentage used.
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