Understanding Schedule Delay Days Rate
How we calculate. Delay % = total delay days ÷ planned workdays × 100. The form uses the same arithmetic as the worked examples on this page. See our methodology and accuracy policy.
Real-world scenario: A typical Schedule Delay Days Rate case uses delay days 9 and planned workdays 60. Enter the same figures below to reproduce the worked path.
What is Schedule Delay Days Rate?
A calendar delay KPI broader than weather-only delay %. Not SPI/SV—those are earned-value tools on the Professional hub.
- All-cause delay days (or labeled subset)
- Same workday basis
- Cross-link weather delay % for weather-only
The Formula
Worked Example
Common Use Cases
- Schedule narrative: delay intensity
- Owner reports: lost workdays
- Risk reviews: delay vs plan
Pro Tips
- Code delay causes
- Avoid double-counting concurrent delays
- Use SPI for EV schedule performance
Limitations: Schedule Delay Days Rate results are educational construction planning aids—not engineering, safety, legal, or cost-estimating advice. Confirm definitions with your project controls, safety, and contract documents. For earned-value SPI/CPI see the Professional hub.
FAQ
Different from weather delay %?
Weather delay % is weather-only. This tool uses total delay days—narrow the numerator if you want a cause-specific rate.
What if planned workdays is 0?
Delay % is undefined—enter a positive planned workday count.
Authoritative References
For construction project controls and safety rate concepts, consult: