Workspace

From single runs to a whole job.

Circuits you save from any calculator collect here. Everything stays in this browser - no account, no upload, no server holding your job.

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Your circuits live here

Size a circuit in any calculator and save it. Circuits stay in this browser - nothing is uploaded, and no account is involved. A free list holds 4 circuits and builds the panel schedule and job sheet from them.

Size your first circuit Ampacity lookup

Every figure on this page comes from the 2023 NEC (NFPA 70, 2023). The code is republished on a three-year cycle and adoption varies by jurisdiction - confirm against your locally adopted edition and your authority having jurisdiction (AHJ) before you build.

Reference estimate - verify before you build. AmpSizer reports reference estimates transcribed from published tables in the 2023 NEC (NFPA 70, 2023), and from no other edition. It is not a substitute for the code adopted in your jurisdiction. The code is republished on a three-year cycle and adoption varies by jurisdiction - confirm against your locally adopted edition and your authority having jurisdiction (AHJ) before you build. Final conductor sizing, overcurrent protection, and installation must be determined by a licensed electrician and approved by your AHJ.

A panel schedule assembled here is a planning aid, not a load calculation. Demand factors, continuous-load allowances, and service sizing are separate calculations that a qualified person must perform.

Jurisdictions adopt editions on their own schedule and frequently amend them, so the edition enforced where you work may not be the one cited here. Confirm which edition and which local amendments apply to your job before relying on any value on this page.