Construction Contract Comparison Calculator

Compare lump sum, GMP, and cost-plus construction contract types to understand owner exposure, contractor profit, and risk allocation.

Legal Disclaimer

This calculator provides general estimates only and does not constitute legal advice. Laws, regulations, and court procedures vary significantly by jurisdiction. Consult a licensed attorney in your area for advice specific to your situation.

Inputs

Estimated project cost ($)

Contract type (0=Lump Sum, 1=GMP, 2=Cost-Plus)

Contractor markup (%)

Contingency (%)

Expected change orders (%)

Project duration (months)

Tab to move between fields

Results

Owner max exposure ($)

$600,000.00

Contractor profit ($)$125,000.00

Contingency reserve ($)$50,000.00

Change order exposure ($)$25,000.00

Monthly burn rate ($)$50,000.00

Owner risk score (0-100)25

Type NameLump Sum

Cost Per (sq ft) Equiv$240.00

How to Use This Calculator

Enter contract values and key terms for up to three contractor bids.
Include payment schedule terms, retainage %, and completion timeline for each bid.
Add insurance requirements and bonding costs to compare total risk-adjusted costs.
Review side-by-side comparison of all bids.
The lowest bid is not always the best — evaluate contractor reputation, timeline, and payment terms holistically.

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