EV Load Calc: NEC Wire & Fill

EV Load Calc is 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. Get: - Circuit breaker size (NEC 240.6(A), 210.20(A)) - Minimum conductor gauge (NEC Table 310.16) - Voltage drop percentage with pass/fail (NEC 210.19(A)) - Automatic wire upsizing when voltage drop exceeds 3% - Ambient temperature derating (NEC Table 310.15(B)(1)) - Wire cost estimate with custom $/ft override 🔌 MULTI-CHARGER / FLEET SIZING (PRO) Size feeder circuits for commercial and fleet installs with 2-20 chargers. Compare results with and without an Energy Management System (EMS) per NEC 625.42 to see how much you save on breaker and conductor sizing. 🏠 PANEL CAPACITY CHECK (PRO) Find out if an existing residential panel can support an EV charger before you pull a permit. - NEC 220 Standard Method with full demand factors - NEC 220.82 Optional Method toggle for comparison - General lighting, small appliance, laundry, fixed appliances, range, dryer, HVAC, and EV charger loads - Pass/fail verdict with headroom or over-capacity in amps 📐 CONDUIT FILL CALCULATOR NEC Chapter 9 conduit fill - select conduit type (EMT, IMC, RMC, PVC, FMC), trade size, and add conductors. 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 in green. 📋 CHARGER DATABASE Quick-reference specs for 40+ popular EV chargers from Tesla, ChargePoint, Wallbox, Autel, Siemens, Ford, GM, Rivian, and more. Max amps, voltage, connector type, required breaker, and wire gauge at a glance. 🔢 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 & 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 baked 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 (AHJ). Always have a qualified professional review and approve any electrical installation.