Free Construction Calculators & Tools/Extension of Time Calculator (EOT)

Extension of Time Calculator (EOT)

Calculate Extension of Time entitlements for construction delays. Analyze delay events, float consumption, concurrent delays, and generate EOT claim summaries.

Contract Details

Available float in critical path

Delay Events
Event #1
Event #2
Delay Event Types
Employer DelayEOT Entitled
Contractor DelayNot Entitled
Neutral Event (Force Majeure)EOT Entitled
Concurrent DelayPartial

EOT Entitlement

44

New Completion

2025-02-13

Float Remaining

30

Extension of Time Summary

Total EOT Entitlement

44 days

New Completion Date

2025-02-13

Delay Analysis Breakdown
Late site access by Employer
+28 days
Gross: 28dFloat: -0dNet: 28d
Unusual weather conditions
+16 days
Gross: 16dFloat: -0dNet: 16d
Delays by Category
Employer Delays28days
Neutral Events16days
Contractor Delays0days
Total Critical Delay44days
Float Consumption0 / 30 days

30 days of float remaining

Notes:

  • EOT entitlement based on SCL Delay Protocol principles
  • Float is consumed before delays become critical
  • Concurrent delays may require detailed window analysis
  • Consult contract clauses for specific EOT provisions
  • Document all delay events contemporaneously
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FINANCIAL DISCLAIMER

This calculator provides INDICATIVE FIGURES for reference purposes only.

Important:

1. Results are based on standard formulas and user-provided inputs. Actual contractual amounts may differ based on specific contract terms and conditions.

About This Calculator

This Extension of Time (EOT) Calculator helps contractors and consultants analyze delay events and calculate time entitlements per FIDIC contract provisions. Evaluate excusable delays, assess float consumption, identify concurrent delays, and generate substantiated EOT claims. Essential for contract management in UAE and Gulf construction projects where delays often arise from weather, late instructions, or unforeseen conditions.

When to Use This Calculator

  • Analyzing project delays for EOT claims
  • Determining impact of employer-caused delays
  • Evaluating weather delays against contract provisions
  • Assessing concurrent delay situations
  • Preparing substantiated EOT submissions

How to Use This Calculator

1

Enter baseline dates

Input original contract start, completion, and key milestone dates

2

Log delay events

Record each delay with start date, duration, and cause category

3

Classify delay type

Categorize as excusable, compensable, or contractor risk

4

Assess float impact

Determine if delay consumed float or impacted critical path

5

Generate EOT calculation

Review entitled days considering concurrency and float

Typical Scenarios in UAE & Gulf Projects

Dubai Commercial Tower Weather Delays

45 days lost to exceptional weather events (sandstorms, rain) during facade installation. Calculator compares actual weather days against 10-year UAE climate data, identifies 32 days exceeding normal allowances, and generates EOT claim with meteorological evidence.

Abu Dhabi Infrastructure Late Approvals

Critical path delayed 60 days awaiting design approval from consultant. Concurrent contractor delay of 15 days for late material delivery. Calculator applies time-impact analysis showing 45 days net EOT entitlement (60 - 15 concurrency offset).

Frequently Asked Questions

Excusable delays entitle the contractor to time extension only (EOT without cost recovery) - examples: exceptional weather, force majeure. Compensable delays entitle both time and cost - examples: late access, design changes, employer-caused disruption. Contractor-caused delays are neither excusable nor compensable.

Concurrent delays occur when employer and contractor events delay the same period. FIDIC 1999 does not address concurrency; the 2017 edition (Sub-Clause 8.5) applies the rules stated in the Special Provisions. A common approach, reflected in the SCL Protocol, is that the contractor gets an EOT but not prolongation costs for truly concurrent delay. Check the contract and take legal advice for disputes.

FIDIC 1999 Red Book Sub-Clause 20.1 requires the Contractor to give notice within 28 days of becoming aware of the event, and a fully detailed claim within 42 days; late notice can time-bar the claim. In the 2017 edition (Sub-Clause 20.2) the notice period is also 28 days and the fully detailed claim is due within 84 days. Check the Particular Conditions, which often change these periods. Always document delay events contemporaneously with daily reports and correspondence.

Take Your Calculations Further

This calculator reflects the logic built into Arkan's construction management platform.

Last Updated: January 2026

Standards Reference: FIDIC 1999 Red Book Sub-Clauses 8.4 and 20.1 (2017 edition: 8.5 and 20.2), SCL Delay and Disruption Protocol

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