EV Load Calc - NEC Compliant

EV Load Calc is a professional-grade 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.

SINGLE CHARGER SIZING
Size a residential EV charger circuit in seconds. Enter the charger amperage, voltage, wire 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 installations with 2-20 chargers. Compare results with and without an Energy Management System (EMS) per NEC 625.42 to see exactly how much you save on breaker and conductor sizing.

PANEL CAPACITY CHECK (Pro)
Determine if an existing residential panel can support an EV charger before you pull a permit. Includes:
- 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. See 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 insp