Construction Estimate Calculator
Build a line-item construction cost estimate.
Last updated 2026-08-21
What Is a Construction Estimate Calculator?
The construction estimate calculator builds a line item estimate by adding materials and labor, then applies a contingency percentage. It produces a total you can take to a lender or compare against a bid. Contingency covers hidden conditions and price changes before you lock a number.
How It Works
Subtotal = Material + Labor. Contingency = Subtotal × % ÷ 100. Total = Subtotal + Contingency.
Example
$40,000 material + $25,000 labor at 10% contingency: $65,000 + $6,500 = $71,500.
How to Calculate
- Enter the material cost for the project, such as $40,000.
- Enter the labor cost, such as $25,000.
- Read the subtotal, which adds the two. That gives $65,000.
- Enter a contingency percentage, such as 10%, and read the contingency amount. That gives $6,500.
- Read the total estimate, which adds the contingency to the subtotal. That gives $71,500, before overhead and profit.
Typical contingency percentages
| Project stage | Contingency | What it covers |
|---|---|---|
| Rough estimate | 10 to 20% | Unknown scope and conditions |
| Design stage | 10 to 15% | Incomplete drawings |
| Detailed takeoff | 5 to 10% | Price changes and small items |
| Renovation work | 10 to 15% | Hidden conditions behind walls |
| Fixed price bid | 5 to 10% | Risk reserve on the contractor |
Sources
Frequently Asked Questions
What is contingency?
A buffer for unknowns like hidden conditions and price changes — usually 5–15% of the hard costs.
Is contingency part of the budget?
Yes, but it should be released only as justified by actual conditions, not spent by default.
Does this include profit?
No — add overhead, profit, or markup on top of this estimate.
Estimate the cost with the Construction Cost Calculator or browse Cost Calculators