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Reading the spec sheet
Twelve electrical calculators a working sparky actually uses — on a phone, on a ladder, with no signal. Ohm's law (1Φ + 3Φ), power/kVA, wire sizing with NEC 310.15 derating, voltage drop (CMA + Ch. 9 Table 9), conduit fill (mixed conductors), motor FLA + OCPD, box fill, dwelling service load (220.82 + 220.83), transformer sizing, grounding (EGC/GEC), GFCI/AFCI required-locations, NEC reference. Free on the App Store and Google Play.
Captured from production build · v1.5.3
Ohm's Law — 1Φ + 3Φ in one tap
The product solves something specific and gets out of your way.
Solve for the missing variable across V, I, and R; power is shown alongside. Toggle 3Φ in the app bar to use line-to-line voltage and power factor for kW. Quick reference any time you're staring at a scope or a meter.
Apparent (kVA) and real (kW) power from amps, volts, and power factor. Convert between amps, kW, and kVA on single or three-phase. Useful for sizing generators and transformers in the field.
Pick load (amps, kW, or kVA), conductor (Cu / Al), continuous vs non-continuous (125% applied), then dial in ambient temperature, current-carrying conductors, and 60/75/90 °C terminal rating. Returns minimum AWG / kcmil with the derated ampacity called out.
Two methods, your choice. Quick CMA (K · I · L) for the 3% rule of thumb, or NEC Ch. 9 Table 9 with effective Z (PVC raceway, pf 0.85) when you need the conservative Code answer. Up-size before pulling a 200-foot run.
EMT, PVC Sch 40 / Sch 80, RMC, IMC, ENT. NEC Chapter 9, Table 1 fill rules (53% / 31% / 40%). Mix conductor types and insulations in the same raceway and get the minimum trade size.
NEC Tables 430.250 / 430.248 full-load amps, 430.52 sizing for inverse-time breakers and dual-element fuses (175% / 300% / 250%), 430.22 conductor sizing at 125% FLA. Single and three-phase.
kVA → primary and secondary FLA, 450.3(B) primary OCPD, conductor sizing recommendations. Single and three-phase, 240 V / 480 V / 208 V common configurations.
Conductors, devices, equipment grounding conductors, and internal cubic-inch volume. Returns required box volume so you don't get red-tagged for cramming a 4" sq with too many wires.
Both methods. 220.82 standard (new dwelling, first 10 kVA at 100% / remainder at 40% + 220.82(C) HVAC). 220.83 optional (existing dwelling adding loads, first 8 kVA at 100% / remainder at 40%). Right-size the panel.
Equipment grounding conductor (NEC 250.122) by OCPD rating. Grounding electrode conductor (NEC 250.66) by service-entrance conductor. Cu / Al for both.
Quick reference for NEC 210.8 (GFCI) and 210.12 (AFCI) — bathrooms, kitchens, garages, outdoor, basements, dwelling-unit branch circuits. Stop digging through the codebook on the truck.
Pick the fit. $5.99/mo to try, $42.99/yr for the best value (saves ~40% over monthly), or $94.99 once — pay once, every future Pro calculator included automatically. Original Pro buyers from earlier versions automatically own Lifetime. No ads, no accounts, no tracking. Cheaper than eMobile NEC or Electrical Calc Elite Plus, which bill $25–$50 yearly forever — and we still keep a Lifetime door open.
Everything you’d want to know about ElectricianCalc on a single sheet. No marketing math.
Same DNA — offline, no ads, no accounts, no tracking. Pro Unlock optional, three tiers.
Want a walkthrough of ElectricianCalc? We do live demos, off-the-record. No salesperson on the call — the people who built it.
