Project Timeline & Delay Cost Calculator

Estimate the total financial impact of construction or project delays, including daily overhead, penalty clauses, and lost opportunity costs.

All fixed daily costs: equipment rental, site supervision, utilities, insurance, etc.
Total calendar days the project is delayed beyond the scheduled completion date.
Contractual penalty charged per day of delay. Enter 0 if not applicable.
Total daily wages and benefits for all workers kept on-site during the delay.
The full value of the project contract. Used to calculate opportunity cost.
Annual return rate you could have earned deploying capital elsewhere (typical: 6–12%).
Estimated daily increase in material costs due to price inflation during the delay period.

Formulas Used

1. Direct Overhead Cost
= Daily Overhead Cost × Delay Days

2. Labor Cost During Delay
= Daily Labor Cost × Delay Days

3. Liquidated Damages
= Penalty Rate ($/day) × Delay Days

4. Opportunity Cost
= Contract Value × (Annual Opportunity Rate ÷ 365) × Delay Days
Reflects the time-value of capital tied up in a stalled project.

5. Material Escalation Cost
= Material Escalation Rate ($/day) × Delay Days

6. Total Delay Cost
= Overhead Cost + Labor Cost + Penalties + Opportunity Cost + Material Escalation

7. Delay Cost as % of Contract
= (Total Delay Cost ÷ Contract Value) × 100

Assumptions & References

  • Daily overhead includes all fixed site costs: equipment rental, supervision, temporary utilities, site security, and project insurance.
  • Liquidated damages (LD) rates are defined in the contract and represent pre-agreed compensation for delay — not a penalty in the legal sense (FIDIC Red Book Clause 8.7; AIA A201-2017 §3.3).
  • Opportunity cost is calculated using simple interest (not compounded) over the delay period, consistent with short-term project finance analysis.
  • Material escalation is treated as a linear daily rate. In practice, escalation may be non-linear and tied to commodity indices (e.g., ENR Construction Cost Index).
  • Severity thresholds: <2% = Low, 2–5% = Moderate, 5–10% = High, >10% = Critical — based on industry norms for acceptable cost variance (PMI PMBOK® Guide, 7th Ed.).
  • This calculator does not account for concurrent delays, force majeure events, or recoverable vs. non-recoverable delay classifications.
  • Consult a construction attorney or claims consultant for formal delay cost claims or dispute resolution.

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