JobWireCalcField calculators

Field aid for electricians

JobWireCalc

Voltage drop and other NEC checks, calculated on your phone.

Four tools for the job site. The arithmetic runs in this browser, and nothing you type is uploaded.

Where it runs: In this browser
Account: None
What you get: An estimate
Before you build: Check the AHJ

Calculators

Written for electricians working under the NEC. Confirm the edition your jurisdiction has adopted. This site is not the code book.

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Voltage Drop Calculator
Volts and percent drop for a one-way copper or aluminum run.
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Wire Size Calculator
Approximate ampacity and a conservative size for the load you enter.
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Conduit Fill Calculator
Approximate fill for one wire size in EMT, PVC, or rigid metal.
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Box Fill Calculator
Volume allowances for conductors, grounds, devices, and clamps.
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