BuildWire Calc is a phone app of offline trade calculators for people who work on site; they keep working with no signal. Electrical: voltage drop, wire size, breaker size, load, Ohm’s law, three-phase power, conduit bending. Construction: concrete slab, footing, rebar, roof pitch, stairs. HVAC: BTU, CFM, duct size, superheat. Save a job and share it as PDF, CSV or text. No ads, no account. Free tier; Pro unlocks the rest.

Website: https://buildwirecalc.com/
Google Play: https://play.google.com/store/apps/details?id=com.skyseedtech.buildwirecalc
App Store: https://apps.apple.com/us/app/buildwire-calc-electrical/id6824496671
Publisher: SKYSEED TECH LLC