Know your numbers before you bid.
Free calculators, state-by-state rules and honest software prices for people who run a construction business. Every figure is sourced and dated.
- No signup, no email gate
- Every number cites its source
- Calculators run in your browser
Tools that show their math
Each one states its formula, cites every default, and lets you print or share the result. Nothing you type leaves your browser.
Bid Price Calculator
Free bid price calculator for contractors. Enter job costs, overhead and your target margin to get the right bid and the markup it takes, with the math shown.
Change Order Calculator
Free change order calculator for contractors. Enter labor, materials, subs and overhead to price a change order by markup or margin, with the math shown.
Surety Bond Cost Calculator for Contractor License Bonds
Free surety bond cost calculator for contractor license bonds: enter the bond amount and credit tier to see the yearly premium range surety agencies publish.
Labor Burden Calculator
Free labor burden calculator with 2026 state unemployment rates built in. Turn an hourly wage into the true cost of a productive hour, with the math shown.
Markup vs Margin Calculator
Free markup vs margin calculator for contractors. Enter either number to convert instantly, price a job from cost, and see the exact formula and worked math.
Retainage Calculator
Free retainage calculator for contractors. Enter your contract sum and work completed to get the payment due, with the pay-app math shown.
What the law says where you build
Contractor license bond amounts and retainage caps, state by state, from the statute or the licensing agency. A verified row carries the date it was verified; a state not yet verified says so.
Plain answers, then the statute
Short, sourced explanations of the questions that cost contractors money. Each one cites its sources, is fact-checked and dated, and links to the calculator that does the math.
Certified Payroll and Form WH-347: What to File Weekly
Certified payroll is a weekly payroll submission plus a signed Statement of Compliance. What Form WH-347 asks for, line by line, and who has to file it.
Fact-checked September 23, 2026 · 5 sourcesEstimatingChange Orders That Get Paid: Notice, Pricing, Signatures
A change order is a signed modification to the contract. See the notice clock, how to price the change like a small bid, and how it reaches the pay application.
Fact-checked September 23, 2026 · 4 sourcesBondsContractor Bond vs Insurance: Who Gets Paid, Who Repays
A bond and a liability policy pay different people and end in different places. See the three-party structure, what each covers, and where a state needs both.
Fact-checked September 23, 2026 · 5 sourcesBondsContractor License Bonds: State Requirements, Cost and Claims (2026)
Which states require a contractor license bond, what one costs at published surety rates, who a claim pays, and who repays the surety afterward.
Fact-checked October 11, 2026 · 9 sourcesInsuranceGeneral Liability Insurance for Contractors: What CGL Covers
What a commercial general liability policy answers for, the two sub-lines that matter on a jobsite, and why this page publishes no premium figure.
Fact-checked September 23, 2026 · 5 sourcesEstimatingHow to Build a Construction Estimate, Line by Line
An estimate is what the work costs you, not what you charge. Takeoff, MasterFormat structure, five cost buckets, contingency and the step to a bid price.
Fact-checked September 23, 2026 · 4 sourcesWhat it really costs, verified on a date
List prices from each vendor’s own pricing page, confirmed on the live page on the date shown, with the per-user fees and card-processing rates a headline price leaves out.
| Software | Best for | Entry plan / mo (annual billing) | Per extra user | Card processing | Verified |
|---|---|---|---|---|---|
| Contractor Foreman | Construction management | $49/moBasic | Not published | 2.9% + $0.30 | |
| Housecall Pro | Field service management | $59/moBasic | $35/mo on Max | from 2.59% | |
| Jobber | Job scheduling, quotes and invoicing | $29/moCore | Not published | Not published | |
| JobTread | Job management with customer and vendor portals | $159/mo | $20/mo on monthly billing | Not published |
Not published: the vendor’s pricing page does not give this figure, or it could not be confirmed there on 2026-09-22. We show a figure only once it has been confirmed on the vendor’s own page.
All vendors, including those without a public price →
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The figures a bid lives on
Built to be checked
Published by Harmony For Humanity LLC · 1309 Coffeen Avenue STE 1200, Sheridan, Wyoming 82801 · [email protected]