Can my panel handle a Level 2 charger?

A quick screening tool: pick your main breaker size and the charger current you're considering, and it applies the NEC 125% continuous-load rule to show the minimum breaker the new circuit needs — and roughly how big a bite that takes out of your panel.

How the math works

125% rule: EV charging is a continuous load (3+ hours), so the NEC requires the circuit to be rated at least 125% of the charging current — a 40 A charger needs 40 × 1.25 = 50 A, rounded up to the next standard breaker size (NEC 240.6).
Panel share: we compare the new breaker to your main breaker as a rough indicator of how much of your service the charger claims. That is a screening heuristic, not an electrical code calculation.

This tool is not a load calculation. Whether your panel can actually take the circuit depends on everything else connected to it — HVAC, range, dryer, hot tub. The real method is the NEC load calculation for existing dwellings (NEC 220.83), which an electrician performs from your actual connected loads. Breaker and wire sizing, panel work, and the load calculation are jobs for a licensed electrician; use this page for budgeting and shopping only. If the numbers come out tight, chargers with adjustable current limits or load management are often cheaper than a service upgrade — see the circuit-sizing guide.