Cost Contingency Toolkit | AMEC College®

Base, Risk, Range, Select, Control. Runs offline in your browser. Your data stays on this computer.

1. Base Estimate

Enter each line in $ thousands (excl. GST, excl. escalation). Tag the confidence: Measured, Allowed or Assumed.

Project name

Estimate date

Line item	Tag	Min	Most likely	Max	Spread vs likely

0Base (sum of most likely)

0Expected total (three-point)

Tip: wider ranges for Allowed and Assumed lines. Keep contingency out of the rates.

2. Risk Register

One specific risk per row (cause, event, effect). Probability in %, impact in $ thousands.

Risk statement	Owner	Prob %	Min	Most likely	Max	Expected value	Response / trigger

0Total expected value of events ($k)

3. Range and Select

Three-point hand method and a simulation of line ranges plus risk events.

Correlation between lines (0 to 1)

Trials

Chosen confidence %

Record who chose the confidence level, when, and why:

4. Budget Stack and Allocation

Uses the simulated total at your chosen confidence. Run the simulation first.

Escalation % p.a.

Years to construction midpoint

GST %

Design allowance % of contingency

Construction %

Owner reserve %

5. Drawdown Log and Cover Ratio

Every draw links to a risk or a documented reason. Variations are not contingency draws.

Date	Amount $k	Linked risk / reason	Bucket	Approved by	Balance $k

Remaining risk exposure $k

6. One-Page Contingency Report

Print or save as PDF from your browser.

General education tool, not legal, financial or professional advice. Figures in the worked example are illustrative. Check current legislation and your contract.