Contractor & Trades Calculators

Who This Hub Is For

These tools are for the people who price and run the work: general contractors, subcontractors, remodelers, and trade business owners — electricians, plumbers, painters, framers, cabinet installers, flooring and finish crews. If you write bids, run crews, or sign the paychecks, this math is your math. It applies whether you are a one-truck operation or running multiple crews.

Reviewed by Gerald G., founder & reviewing editor of CalcAuthority — journeyman cabinet installer, former subcontractor, and former contracting business owner who operated with 18 employees. The problems on this page are ordered the way they show up in a real contracting business.

The Three Math Problems That Decide a Contracting Business

1. Labor cost. The wage on the paycheck is not what an employee costs. Payroll taxes, workers' comp, insurance, benefits, and paid hours that never land on a job push the true cost 25–60% above the wage — and every bid built on raw wages is underpriced before the truck leaves the yard. This is the single most common leak in trade businesses, and it is invisible until you compute it.

2. Bid pricing. Most bad bids are not careless — they use the wrong arithmetic. Overhead and profit are percentages of the price, which means the correct move is division, not markup-on-cost. The difference looks small on one job and compounds into a bad year. A bid also has a floor — the break-even price — and quoting below it is paying to work.

3. Profit leaks. Callbacks are jobs with all the cost and none of the revenue. Missed calls are leads you already paid for, handed to a competitor. Neither shows up as a line item, which is why both quietly consume the margin the first two problems worked so hard to protect.

The Workflow: Run These In Order

Each calculator feeds the next. Start with what an hour of labor really costs and end with what your phone habits are worth.

1. Labor Burden Calculator — turn a wage into the fully burdened hourly cost: taxes, comp, insurance, benefits, and non-productive time included. Everything downstream uses this number.
2. Crew Cost Calculator — what your crew costs per hour, per day, and for the whole job, at burdened rates.
3. Break-Even Job Price Calculator — the price where the job stops losing money, and the price that actually hits your margin target.
4. Bid Check Calculator — stress-test a bid before it goes out: projected profit and margin at the number you are about to quote.
5. Job Profit Margin Calculator — after the job closes, what it actually earned. The gap against your bid projection is your estimating error, itemized.
6. Callback Cost Calculator — what warranty trips cost per year, and how many jobs' profit they erase.
7. Missed Lead Value Calculator — what unanswered calls and slow follow-up cost in lost revenue and profit.

Field Guides

Plain-English explanations of the math above — each with worked numbers and the places the calculation goes wrong.

• Contractor Labor Burden: What an Employee Really Costs
• Markup vs. Margin: The Confusion That Quietly Costs Thousands
• How to Price a Job: From Costs to a Defensible Number
• The Underbidding Trap: Why Busy Isn't the Same as Profitable
• The Real Cost of a Callback
• What a Missed Call Costs

All guides live in the Field Guides index.

How These Calculators Are Built

Every tool follows the CalcAuthority house method: the formula is stated on the page, the assumptions are listed, at least two worked examples let you verify the math by hand, verdict bands explain how to read the result, and a limitations section says what the estimate does not cover. Where a band or benchmark is an editorial rule of thumb rather than a published statistic, the page says so. Full details on the Methodology page.