Know What It Costs. Know What to Charge. Know Whether the Decision Works.

Business decision calculators for contractors, owners, and operators — every formula shown, every assumption stated, every result explained in plain English. No black boxes, no signups. Just the math that decides whether a business makes money.

Contractor Calculators

Know what your labor really costs, what the job has to sell for, and whether the bid makes money before you send it.

Labor Burden Calculator
The wage is not the cost.
Crew Cost Calculator
Enter crew size, burdened hourly cost, hours per day, and days on the job — get the real cost of putting your crew on site, per hour, per day, and for the whole job.
Break-Even Job Price Calculator
Enter direct job costs, overhead percentage, and target margin — get the price where the job stops losing money and the price that actually hits your profit target.
Bid Check Calculator
Stress-test a bid before you send it.
Job Profit Margin Calculator
Enter contract price, labor, materials, subs, and overhead share — see the job's gross profit, gross margin, and true margin after overhead.
Callback Cost Calculator
Callbacks are unbilled jobs.
Missed Lead Value Calculator
Enter missed leads per month, close rate, average job revenue, and margin — see the revenue and gross profit walking past your business every year.

Open the Contractors & Trades hub ›

Small Business Calculators

Cash runway, break-even, overhead, pricing, and rate-setting — the decision math every operator lives by.

Cash Runway Calculator
Enter cash on hand, average monthly cash in, and cash out — see your monthly burn and how many months your business can operate before the account hits zero.
Break-Even Revenue Calculator
Enter monthly fixed costs and gross margin — get the monthly and per-day revenue your business must produce before it earns its first dollar of profit.
Overhead Recovery Calculator
Enter annual overhead and billable hours — see the overhead each billable hour must recover, and what share of revenue your overhead consumes.
Price Increase Impact Calculator
Model a price increase: enter revenue, gross margin, increase percentage, and expected customer loss — see the profit change and how many customers you can afford to lose.
Customer Acquisition Payback Calculator
Enter monthly marketing spend, new customers won, and gross profit per customer per month — get your CAC and how many months until a customer repays it.
Freelance Rate Builder
Work backward from the income you need: enter target income, overhead, billable hours, and a buffer — get the hourly rate your freelance business must charge.

Open the Small Business hub ›

More Calculators

One place to browse the full CalcAuthority calculator library — the operator tools above, plus earlier salary, loan, math, time, and conversion calculators that remain available.

Browse all calculators ›

Salary & Paycheck Loans & Mortgage Percentage & Math Time & Work Unit Conversions

The Method Behind Every Calculator

A calculator that just returns a number is a black box. Ours are built to show their work — five parts, on every serious tool:

Full details on the Methodology page.

Reviewed by an Operator, Not Just a Calculator

CalcAuthority was founded by Gerald G., Founder and Reviewing Editor — a journeyman cabinet installer who worked as a subcontractor and went on to own and run a contracting business with 18 employees. The tools focus on the math that actually decides whether a job or a business makes money, because that is the math he lived with: bidding work, running crews, and meeting payroll. Contractor tools draw on field experience; general business tools rest on established formulas, shown in full. Read more about CalcAuthority.

Field Guides

Plain-English explanations of the math behind the tools — worked numbers, and where each calculation goes wrong.

All field guides ›

How Our Calculators Work

Each calculator follows the same structure: an interactive tool, a How It Works section stating the formula, Worked Examples applying it to real numbers, guidance on what the result means and when to use it, and a FAQ. The Methodology page explains our formula, benchmark, and verdict-band policies. The Field Guides explain the reasoning behind the math.

Results are estimates for planning purposes only — not financial, tax, legal, or accounting advice. See our Financial Disclaimer.