Contractor Bid Calculator Formula
Understand the math behind the contractor bid calculator. Each variable explained with a worked example.
Formulas Used
Base Cost
base_cost_display = base_costProfit Amount
profit_amount = base_cost * profit_margin / 100Bid Total
bid_total = base_cost * (1 + profit_margin / 100)Variables
| Variable | Description | Default |
|---|---|---|
labor | Labor Costs(USD) | 8000 |
materials | Material Costs(USD) | 5000 |
overhead | Overhead Costs(USD) | 2000 |
profit_margin | Desired Profit Margin(%) | 15 |
base_cost | Derived value= labor + materials + overhead | calculated |
How It Works
How to Calculate a Contractor Bid
Formula
Bid Total = (Labor + Materials + Overhead) x (1 + Profit Margin% / 100)
A solid bid covers all your costs and includes a fair profit. Underestimating costs leads to losses. Make sure to include all overhead items and add a contingency buffer to material and labor estimates.
Worked Example
A contractor bids on a job with $8,000 labor, $5,000 materials, $2,000 overhead, and wants a 15% profit margin.
- 01Base cost = $8,000 + $5,000 + $2,000 = $15,000
- 02Profit = $15,000 x 15% = $2,250
- 03Bid total = $15,000 + $2,250 = $17,250
Frequently Asked Questions
How much profit margin should I include in a bid?
Most contractors target 10-20% profit margin. New contractors may bid lower to build a client base. Established contractors with strong reputations can command 15-25%. Never bid below your costs.
How do I estimate labor costs for a bid?
Break the project into tasks, estimate hours for each, and multiply by your labor rate. Include setup, cleanup, and travel time. Add 10-15% for unexpected delays.
Ready to run the numbers?
Open Contractor Bid Calculator