EV Load Calc: NEC Wire & Fill

Ali3N Studios LLC

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About this app

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.

What’s new

Added Firebase Crashlytics