Project Contingency Calculator
Calculate Project Contingency step by step: Percentage: contingency = base × %.
In short
Formula: Percentage: contingency = base × %. EMV: contingency = Σ (probability × cost impact).
What this calculator does
Calculate Project Contingency step by step: Percentage: contingency = base × %. Worked example, questions and limitations included.
Use it to turn Currency (symbol only, never converted), Method, Base cost estimate, Contingency percentage, and the other shown inputs into a checked result you can compare, copy, or rerun with different assumptions.
The page shows the formula, a numeric worked example, and the assumptions that affect this project estimation calculation.
Inputs and what they mean
- Currency (symbol only, never converted)
- — choice value.
- Method
- — choice value.
- Base cost estimate
- — number value.
- Contingency percentage
- — number value.
- Risk 1 probability
- — number value.
- Risk 1 cost impact
- — number value.
- Risk 2 probability
- — number value.
- Risk 2 cost impact
- — number value.
- Risk 3 probability
- — number value.
- Risk 3 cost impact
- — number value.
How to use it
- Enter each value in the unit shown next to the box (use the unit converter first if your numbers are in other units).
- Check the breakdown to see every intermediate step.
- Read the limitations before relying on the result.
Formula
Expected monetary value (EMV) analysis is described in the PMBOK Guide's quantitative risk analysis.
EMV averages outcomes; a single risk that occurs will cost its full impact, not its EMV.
No default percentages: use your organisation's guidance or risk register.
Percentage: contingency = base × %. EMV: contingency = Σ (probability × cost impact).
Inputs used: Currency (symbol only, never converted), Method, Base cost estimate, Contingency percentage, Risk 1 probability, Risk 1 cost impact, Risk 2 probability, Risk 2 cost impact, and other shown inputs.
Worked example
Three identified risks
- EMVs = 15,000 + 12,000 + 4,000.
- Contingency = $31,000 (7.75% of base).
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
- Up to three risks.
- Treats risks as independent.
- No schedule contingency.
- Results are planning estimates built only from the figures you enter. They are not a guarantee of cost, schedule or delivery, and they do not replace your organisation's own project controls.
- The result depends on the values you enter for this project contingency calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.
Common questions
Is EMV enough contingency?
For a portfolio of many risks it is a fair average. For a few large risks, consider Monte Carlo analysis or a confidence-level target.
Can I include opportunities?
Yes, as negative impacts, but keep threats and opportunities visible separately in your register. Check the formula, example, and limitations on this page before using the result for a real project estimation decision.
What percentage is normal?
There is no universal figure. It depends on how well defined the scope is; AACE classes give typical accuracy ranges by estimate class.
How do I use the Project Contingency Calculator?
Enter the required values for Currency (symbol only, never converted), Method, Base cost estimate, Contingency percentage, Risk 1 probability, and the other fields shown. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.
What formula does the Project Contingency Calculator use?
Percentage: contingency = base × %. EMV: contingency = Σ (probability × cost impact). The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.
Can the Project Contingency Calculator be used for exact decisions?
Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.
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