Contingency Calculator

Appropriate contingency percentage from project risk assessment.

Estimated Project Cost ($)

Project Phase

Complexity Rating (1–5)

Site Risk (1–5)

Scope Clarity (1–5)

Tab to move between fields

Recommended Contingency (%)

12.06%

Total Contingency ($)

$120,625.00

≈ 8 used cars

Design Contingency (%)4.83%

Construction Contingency (%)7.24%

Design Contingency ($)$48,250.00

Construction Contingency ($)$72,375.00

Total with Contingency ($)$1,120,625.00

How to Use This Calculator

Enter the current estimated project cost before contingency is added.
Select the project phase: 0 = concept/schematic, 1 = design development, 2 = construction documents, 3 = bid/negotiation.
Rate project complexity on a 1–5 scale (1 = simple/standard, 5 = highly complex or unique).
Rate site risk on a 1–5 scale (1 = well-known site, 5 = unknown conditions or difficult terrain).
Rate scope clarity on a 1–5 scale (1 = vague/evolving, 5 = fully defined and documented).
Read the recommended contingency percentage, split between design and construction reserves, and the total project cost with contingency included.

How the result changes with Complexity Rating (1–5)

Estimated Project Cost ($): Current total estimated construction cost before contingency.
Project Phase: 0 = Concept/Schematic, 1 = Design Development, 2 = Construction Docs, 3 = Bid/Negotiation.
Complexity Rating (1–5): 1 = simple/standard, 5 = highly complex/unique construction.
Site Risk (1–5): 1 = well-known/easy access, 5 = unknown conditions/difficult terrain.
Scope Clarity (1–5): 1 = vague/evolving, 5 = fully defined and documented.

Recommended Contingency (%): Recommended total contingency percentage based on phase and risk.
Design Contingency (%): Portion allocated to design-phase unknowns.
Construction Contingency (%): Portion allocated to field/construction unknowns.
Design Contingency ($): Design contingency in dollars.
Construction Contingency ($): Construction contingency in dollars.
Total Contingency ($): Total recommended contingency reserve.
Total with Contingency ($): Estimated cost plus contingency.

Identify Input Parameters
4 parameters
Estimated Project Cost ($) = 1000000, Project Phase = 1, Complexity Rating (1–5) = 3, Site Risk (1–5) = 2 = 5 input(s) provided
Calculate Recommended Contingency
Recommended Contingency = lowPct + (highPct - lowPct) * combinedFactor
12.06 = 12.06%
Calculate Total Contingency
Total Contingency = designContingency + constructionContingency
120625 = $120,625
Calculate Design Contingency
4.83 = 4.83%
Calculate Construction Contingency
Construction Contingency = baseContingencyPct - designContingencyPct
7.24 = 7.24%