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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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.

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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Equipment Cost Per Hour Calculator

Free equipment cost per hour calculator for contractors. Enter a machine's price, hours and running costs to get its owning and operating cost per hour.

In: Machine price, salvage, life, hours per year, yearly costs, fuel, maintenance, wear, operator cost

Out: Ownership and operating cost per hour, machine cost per hour, and the cost per hour with an operator

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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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Lien Deadline Calculator

Free lien deadline calculator for contractors. Enter project dates to count the dated deadlines in a published state's rules, with the statute sentence shown.

In: State, role, project type, and the project dates that have happened

Out: Each counted deadline date in the published rules, with the arithmetic and the statute sentence beside it

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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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Over/Under Billing Calculator

Free over/under billing calculator for contractors. Enter contract, estimated cost, cost to date and billed to date to get percent complete and earned revenue.

In: Contract amount, estimated total cost, cost to date, billed to date for one job

Out: Percent complete, earned revenue, over or under billing, gross profit to date, cost to complete, backlog

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Overhead Rate Calculator

Free overhead rate calculator for contractors. Enter a year of overhead and a forecast to get the rate per direct dollar, per revenue dollar and per hour.

In: A year of overhead, forecast direct cost, revenue and field hours, one job's cost

Out: Overhead as % of direct cost and revenue, per field hour, monthly, and on one job

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