Panel Load Calculator
Calculate the demand load on a panel to NEC Article 220, convert it to amps, and see how much spare capacity is genuinely left before you add to it.
Connected load and demand load are not the same number, and Article 220 exists because assuming everything runs at once produces a service far larger than any building needs. Applying the demand factors is what turns a nameplate total into something a utility will accept.
What the plan reviewer checks
On a tenant improvement the answer usually decides whether the existing service survives the project. Establish it before the equipment schedule is signed off, not after.
Need the whole set drawn and stamped? Ask for a fixed quote, or see the other calculators.
Complete MEP permit set built to get approved.
Every mechanical, electrical, plumbing, and fire sheet your reviewer needs — a fixed quote in 24 business hours, first sets in as few as 5 working days, and city comments answered until your permit is issued.