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Free construction & electrical calculators that just work.

Productivity and AIA pay apps to voltage drop, conduit fill, and box fill — calculated instantly in the browser. No email, no account. Built by a licensed electrical contractor, for the trades.

Construction & financial

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Construction Productivity (PI) Calculator

Plug in budgeted hours, actual hours, and quantity installed by cost code. Get Performance Index (PI), percent complete, earned hours, forecast at completion, and gain/fade — color-coded.

For: PMs, supers, and estimators tracking labor productivity on commercial / mechanical / specialty trade work.

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AIA G702 / G703 Pay App Calculator

Full G702 + G703 form with schedule of values, retainage, change orders, materials stored, and current payment due. Calculates every line automatically.

For: GCs and subs preparing AIA-style progress billings to architects and owners.

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Concrete Calculator

Cubic yards, cubic feet, and 40/60/80 lb bag counts for slabs, footings, walls, and round columns — with a built-in waste factor.

For: Anyone ordering or placing concrete who needs a quick, reliable volume.

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Markup vs Margin Calculator

Enter cost and a markup % or target margin %. Get the sell price, profit, and the conversion between markup and margin so you never underprice.

For: Estimators and owners pricing work who need margin, not just markup.

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Retainage Calculator

Retainage withheld, net payment due, and the running retainage balance from this period's completed work and your retainage rate.

For: GCs and subs tracking retention held across progress billings.

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Labor Burden Calculator

Turn a base wage into the fully burdened hourly cost — payroll taxes, workers' comp, liability, benefits, and overhead — so you bid labor right.

For: Estimators and owners pricing labor-heavy work.

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Manpower Loading & S-Curve Generator

Enter planned and actual hours by week and watch the labor histogram and the cumulative S-curve draw themselves — with crew size, peak crew, percent complete, and variance.

For: PMs, superintendents, and schedulers planning labor and tracking progress against plan.

Electrical · NEC

Also free — Excel & PDF templates

25 ready-to-use construction templates — daily field reports, RFIs, change orders, weld logs, punch lists, JSAs, schedule of values, manpower loading & S-curve, T&M tickets, and more.

Browse free templates →

Tired of calculators in spreadsheets?

Field PM tracks productivity, runs AIA billing, and handles the rest of your PM workflow in one platform — $99/month with unlimited foremen, QAQC, safety & subs free. 30-day trial, no credit card.

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