Residential electrical planning

Know what your electrical service can support.

Estimate whole-home demand in amps before adding an EV charger, heat pump, range, dryer, or hot tub. Get a clear service-size signal and a sensible next step.

Calculate my panel load See how it works
NEC-based methodFree to useNo signup

Your estimate

Start with what you know

Change any value and the result updates instantly. Defaults are labeled as typical estimates, not readings from your equipment.

Configuration

SQ.FT

Used for the general lighting estimate.

Usually printed on the main breaker.

Appliance wattages are typical planning estimates. Use the nameplate or installer calculation for final sizing.

Your planning result

0Estimated demand · amps
Total demand— VA
Suggested service100A
Current serviceNot selected

Main planning load: Central A/C · 4.5 kW typical estimate

Is your service large enough for a 100A plan?

Choose the main breaker size above to compare this estimate with your existing service.

Choose current service

Make a confident decision

Understand the number before you spend

Use these short guides to check assumptions, compare options, and know what to ask a licensed electrician.

EV planning

Can your panel support an EV charger?

Understand continuous-load rules before choosing a charger size.

Read guide Service sizing

100A vs. 200A service

See when an older service becomes the limiting factor in an all-electric home.

Read guide Methodology

How the NEC calculation works

Review the demand factors used by this planning estimate.

Read guide

Know the boundary

Useful for planning, not permit approval.

This estimate cannot inspect wiring, equipment condition, utility requirements, or local amendments. A licensed electrician must confirm the final design before work begins.

Review the method