Calculators

Calculators that show their math

Every tool prints its formula and a worked example, runs in your browser, and never stores what you type.

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.

In: Direct costs, overhead %, target margin

Out: Bid price, markup, profit and what a lower number costs you

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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.

In: Labor hours and rate, burden %, materials, subs, equipment, overhead %, markup or margin

Out: Change order price, wages, burden, overhead and profit, priced like a small bid

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Contractor License Bond Cost Calculator

Free contractor license bond cost calculator. Enter your bond amount and credit tier for the annual premium range published surety agencies quote.

In: State, bond amount and credit tier; the state fills the amount only where every licensee needs a bond

Out: Annual premium range, low to high, with every published source behind it

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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.

In: State, hourly wage, hours, PTO, SUTA/FUTA, workers' comp, GL and benefits

Out: True cost per productive hour, total burden, and the minimum rate to bill

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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.

In: Markup % or margin % (whichever you know), plus an optional job cost

Out: The other percentage, converted, plus the price and profit it prices out to

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