Skip to content

Panel Demand and Space Planner

Reconcile documented split-phase demand categories and per-leg current, then count actual panel spaces and circuits in a separate inventory.

Use this result well

Inputs that matter
Calculation method and edition, Line-to-line voltage (V), Service or feeder current limit per leg (A), Demand categories and leg allocation, and 5 more
Output to expect
Split-phase demand reconciliation, Panel space and circuit inventory
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
Was this tool helpful?

Related Tools

Tools you might need next

EV Charging Circuit and Time Planner

Check configured EVSE AC current against ordinary circuit limits, then estimate charging energy and time using vehicle acceptance and efficiency.

Recommended next stepElectrical Work
AFCI Circuit and Breaker Inventory

Count unique planned AFCI and dual-function breakers from reviewed circuits, retaining approved alternative protection and unresolved decisions.

Recommended next stepElectrical Work
Wire Gauge and Ampacity Selection

Compare copper and aluminum chart sizes using required ampacity, correction factors, terminal ratings and protection limits; save the full basis.

Electrical Work

Reference & details

How it works

Split-phase demand reconciliation

Reconcile a documented 120/240-type split-phase service or feeder calculation by load category and leg. Enter each category's connected VA, independently established demand percentage and separately required VA adder. Select the method with the authority reviewing the installation; no blanket 40% demand factor or automatic service size is supplied.

Category demand = connected VA × entered % / 100 + adder VA; L1/L2 current = allocated leg VA ÷ line-to-neutral voltage.

Panel space and circuit inventory

Count physical panel spaces and supported circuit positions from an actual equipment schedule. Breaker pole count, occupied spaces and supported circuits are separate manufacturer-defined quantities, especially for tandem and quad devices.

Used spaces = Σ(quantity × spaces each); used circuits = Σ(quantity × circuits each).

Updated: September 2026

Example Scenarios

Try the built-in example, then replace its source data with your actual documented values. Retain failed comparisons and unresolved decisions.

→ Entered leg currents fit the stated limit

Try the built-in example, then replace its source data with your actual documented values. Retain failed comparisons and unresolved decisions.

→ Counts fit the listed panel limits

FAQ

Reconcile a documented 120/240-type split-phase service or feeder calculation by load category and leg. Enter each category's connected VA, independently established demand percentage and separately required VA adder. Select the method with the authority reviewing the installation; no blanket 40% demand factor or automatic service size is supplied. Count physical panel spaces and supported circuit positions from an actual equipment schedule. Breaker pole count, occupied spaces and supported circuits are separate manufacturer-defined quantities, especially for tandem and quad devices.

Use the exact equipment, dimensions, current ratings, operating conditions and applicable requirements described in the selected mode. Unknown values are not replaced by a generic wire, device count or capacity. Illustrative examples are arithmetic examples, not an approved installation.

Save planning case keeps an explicit local history entry. Copy MD retains current inputs, source notes and interpretation; Download CSV exports the current result breakdown. Export a separate copy before changing devices or clearing browser storage.

About Panel Demand and Space Planner

Reconcile a documented 120/240-type split-phase service or feeder calculation by load category and leg. Enter each category's connected VA, independently established demand percentage and separately required VA adder. Select the method with the authority reviewing the installation; no blanket 40% demand factor or automatic service size is supplied. Count physical panel spaces and supported circuit positions from an actual equipment schedule. Breaker pole count, occupied spaces and supported circuits are separate manufacturer-defined quantities, especially for tandem and quad devices.