How to calculate load on 200 amp service?

Calculate the load on a 200 amp service with NEC 220.82: add general lighting at 3 VA per square foot, 1,500 VA per small-appliance and laundry circuit, and every fixed appliance at nameplate. Take the first 10 kVA at 100 percent, the remainder at 40 percent, then add the larger of heating or cooling.

Divide by 240 for amps. A big all-electric house often lands between 120 and 160, which is the headroom story a 200 amp service exists to tell.

Adding an EV charger or heat pump later? 220.87 lets a year of recorded peak demand stand in for the calculation, and it usually shows more spare capacity than the formula.

Breaker handle totals mean nothing here; only the calculation counts.

The service load calculator runs 220.82 for your exact house in minutes.