FREE CALCULATOR
Overtime Productivity Loss Calculator
Estimate when overtime schedules stop delivering proportional productive output and start eroding labor efficiency and margin. A planning tool for commercial contractors evaluating schedule acceleration strategies.
Schedule and Cost Inputs
Note: Default productivity factors are conservative planning estimates. Actual productivity varies by crew, supervision, site conditions, weather, fatigue, and project complexity.
Results
High riskRisk Assessment
Overtime is eroding labor efficiency and margin more aggressively. Consider limiting duration or changing approach.
These results are planning estimates, not guarantees or legal determinations.
Cost Breakdown
Risk levels are operational planning guidance only.
Effective Productive Hours
1,872
Lost Productive Hours
528
Total Labor Cost
$238,000.00
Cost per Productive Hour
$127.14
Productivity vs Cost Over Time
Schedule Comparison
Compare how different overtime schedules perform under the same assumptions.
| Schedule | Scheduled Hours | Effective Hours | Cost/Productive Hr | Risk Level |
|---|---|---|---|---|
| 5x10 | 2,000 | 1,840 | $101.63 | Low risk |
| 6x10(selected) | 2,400 | 1,872 | $127.14 | High risk |
| 7x10 | 2,800 | 1,904 | $151.79 | Danger zone |
| 7x12 | 3,360 | 1,613 | $223.46 | Danger zone |
Worked Example: 6 x 10 Schedule
Commercial MEP contractor, 10-person crew, 6 x 10 schedule, 4 consecutive weeks, $85/hr loaded labor cost, 1.5x overtime multiplier
Key insight: At week 4 on a 6 x 10 schedule with default productivity estimates:
- Cost per productive hour rises from $85.00 to $121.47 (43% increase)
- Lost productive hours equal roughly 1.3 full-time workers over 4 weeks
- Risk level: Rising risk — overtime is starting to drag on output
- Consider limiting duration or evaluating shift work as an alternative to extended overtime
Why Overtime Productivity Loss Matters
Overtime premium is only part of the cost.
When you schedule overtime, you pay more per hour. But you also get less productive output per hour as fatigue, errors, and reduced pace compound over consecutive weeks. This calculator estimates both effects so you can see the real cost per productive hour.
More scheduled hours do not equal proportional output.
If overtime pushes your cost per productive hour up but your billing rate stays flat, margin disappears. Use the break-even labor hours calculator to check whether your billed labor hours are enough to cover overhead and protect profit.
Before committing to overtime as a recovery strategy, understand what the original delay is costing you. The delay cost impact calculator shows the baseline cost of the delay so you can weigh recovery expense against the delay damage.
A 6 x 10 schedule adds 50% more hours than a standard week, but research and field experience show that productive output often increases by far less — and may even decline on extended schedules. The curve bends against you.
Extended overtime raises cost per productive hour quickly.
As consecutive overtime weeks accumulate, productivity tends to drop while premium pay continues. Cost per productive hour can climb sharply, eroding margin even if the schedule looks aggressive on paper.
This is planning guidance only.
Default productivity factors are conservative estimates based on industry research. Actual performance depends on crew quality, supervision, site conditions, weather, safety incidents, morale, and project complexity. Use this calculator as a starting point for planning, not as a definitive project analysis.
FROM PLANNING CALCULATOR TO MARGIN PROTECTION
This calculator estimates labor-efficiency risk from overtime.
Quoteloc helps contractor teams catch pricing risk and margin risk before the quote is sent. Standardize labor cost, protect floor price, and keep every quote aligned with real project economics.