EV Calc Pro vs EV Load Calc

EV Calc Pro is the professional-grade electrical calculator built specifically for EV charger installers and electricians. Stop doing math on paper — get accurate, NEC-compliant results in seconds. CALCULATORS INCLUDED: EV Charger Load — Complete circuit analysis for EV charger installations EV Site Load — Full service load calculation for multi-charger sites (NEC 220, 625) Wire Size — NEC conductor sizing with temperature and conduit corrections Voltage Drop — Voltage drop analysis with pass/fail results Breaker Sizing — Overcurrent protection sizing per NEC Transformer Sizing — kVA transformer sizing for EV service upgrades Conduit Fill — NEC 358/344 conduit fill percentage calculator Grounding Conductor — Equipment grounding conductor sizing Ampacity Derating — Temperature and conduit fill derating per NEC 310 Box Fill — NEC 314.16 box fill calculation Power Calculator — Watts, amps, and volts conversion WHY EV CALC PRO: • Built for the field — fast inputs, instant results • 100% offline — no internet required, works on job sites • NEC code references on every calculator • Dark mode for working in low-light conditions • Export and share results via text, email, or any app • Free — no subscription, no paywalls Part of the Charge Rigs family of tools for EV charging professionals.

The electrical load calculator built for electricians, contractors, and engineers who install EV charging equipment. Every calculation references the NEC (NFPA 70) with full transparency — see the exact article, formula, and math behind every result. Built by a low-voltage integrator who got tired of flipping through the code book on ladders. If you spec, permit, or install EV chargers, this is the tool that lives in your pocket. SINGLE CHARGER SIZING Size a residential EV charger circuit in seconds. Enter the amperage, voltage, run distance, conductor material, and insulation type. Results include circuit breaker size per NEC 240.6(A) and 210.20(A), minimum conductor gauge per NEC Table 310.16, voltage drop percentage with pass/fail per NEC 210.19(A), automatic wire upsizing when voltage drop exceeds 3%, ambient temperature derating per NEC Table 310.15(B)(1), and a wire cost estimate with custom per-foot override. MULTI-CHARGER AND FLEET SIZING (PRO) Size feeder circuits for commercial and fleet installs with 2 to 20 chargers. Compare results with and without an Energy Management System per NEC 625.42 to see how much you save on breaker and conductor sizing. PANEL CAPACITY CHECK (PRO) Determine whether an existing residential panel can support an EV charger before you pull a permit. Uses NEC 220 Standard Method with full demand factors and an NEC 220.82 Optional Method toggle for comparison. CONDUIT FILL CALCULATOR NEC Chapter 9 conduit fill for EMT, IMC, RMC, PVC, and FMC. Shows fill percentage, pass/fail against Table 1 limits, and recommends minimum conduit size. SIDE-BY-SIDE COMPARISON Compare two charger configurations head-to-head. See which option gives you a smaller breaker, lighter wire, or lower voltage drop — differences highlighted clearly. CHARGER DATABASE Quick-reference specs for 40+ popular EV chargers from Tesla, ChargePoint, Wallbox, Autel, Siemens, Ford, GM, Rivian, and more. UNIT CONVERTER AWG to mm2, feet to meters, watts/volts/amps calculator, and kW to amps with 125% continuous load factor. SHOW YOUR WORK Every calculation expands to show step-by-step math with NEC article references. Export results as a formatted PDF or share as text — ready for permit applications, AHJ inspections, or client proposals. SAVE AND ORGANIZE Save calculations with custom names and notes. Pull up past jobs instantly. FULLY OFFLINE No internet required. No data leaves your device. NEC tables are built into the app for instant results on the job site. NEC REFERENCES INCLUDED Article 625 (Electric Vehicle Charging), Article 220 (Branch-Circuit, Feeder, and Service Load Calculations), Article 210 (Branch Circuits), Article 240 (Overcurrent Protection), Table 310.16 (Conductor Ampacities), Table 310.15(B)(1) (Temperature Correction Factors), Chapter 9 (Conduit Fill Tables), Article 220.82 (Optional Method). DISCLAIMER EV Load Calc is an educational and reference tool. It is not a substitute for a licensed electrician or your local Authority Having Jurisdiction. Always have a qualified professional review and approve any electrical installation.