BuildWire Calc: Electrical

BuildWire Calc puts 36 field calculators for electricians, builders and HVAC technicians in one fast app. Everything runs on your phone, so it works in a basement, on a roof or on a site with no signal.

Free: voltage drop, Ohm's law, watts to amps, concrete slab, roof pitch, board feet, BTU, CFM and BTU to kW.
Pro: the other 27 calculators, plus PDF and CSV export of saved jobs.

ELECTRICAL (11)
Voltage drop, wire size, breaker size, service load, Ohm's law, watts to amps, three phase power, conduit bending, AWG to mm2, transformer size, generator size.

CONSTRUCTION (15)
Concrete slab, footing, steps and block wall, slab rebar, gravel, roof pitch, rafter length, retaining wall blocks, board feet, stud spacing, shingle bundles, drywall screws, stair railing, stair stringer.

HVAC (10)
BTU for cooling and heating, AC size, CFM, duct size, furnace size, heat pump size, superheat and subcooling, dew point, BTU to kW, refrigerant PT chart.

BUILT FOR THE JOB
- See the answer as you type. Every result shows its calculation steps and warnings, so you can check the work.
- Jobs: save any result to a job (a customer, a quote, a site) and keep them together.
- Share a job as a PDF or CSV, or copy it as text, with the system share sheet.
- Use it in 14 languages. Imperial or metric, light or dark, favourites and history for the calculators you use most.
- Private by design: no account, no ads, no tracking. Your jobs and history stay on your device.

PRO
Pro unlocks all 36 calculators and job export. Choose a one-time purchase or a yearly subscription. The subscription renews each year until you cancel in your Apple ID settings; you can restore purchases at any time from Settings.

Important: results are estimates for planning. Always verify against your local electrical or building code, the manufacturer's data and the project drawings. Code tables that are copyrighted are not included.

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