Range Demand Calculator

A Range Demand Calculator estimates the diversified demand contribution of multiple electric ranges when a reviewed residential load workflow uses entered-demand arithmetic rather than a selected demand-table value.

The calculation produces an Estimated range demand in VA. That value can be carried into a broader dwelling load worksheet or internal load review, where it may affect the calculated service or feeder load used for conductor ampacity, overcurrent protection, panel capacity, and voltage-drop evaluation. It does not independently select branch-circuit conductors, feeder conductors, raceway size, or a final service rating.

The method retains the Largest range load at its full connected value and applies the Entered demand factor only to the Additional range load. The difference between total connected range load and the calculated demand is reported as the Diversity allowance.

Range Load Inputs

Input	Electrical meaning
Largest range load	The VA rating of the single largest range included in the calculation. This load remains at 100%.
Additional range load	The combined VA rating of all other ranges included in the same calculation.
Entered demand factor	The percentage applied to Additional range load. The factor must come from the reviewed design workflow, engineering basis, adopted demand method, or other approved source.

Use nameplate or documented connected-load values consistent with the load calculation being prepared. Do not substitute an individual branch-circuit breaker rating for a range VA rating unless that rating is the documented basis used by the applicable load method.

The calculator combines the two entered load groups:

\(\displaystyle \text{Connected range load} = \text{Largest range load} + \text{Additional range load}\)

Demand Calculation

The arithmetic is:

\(\displaystyle \text{Estimated range demand} = \text{Largest range load} + \left( \text{Additional range load} \times \frac{\text{Entered demand factor}}{100} \right)\)

The calculator also reports:

\(\displaystyle \text{Diversity allowance} = \text{Connected range load} - \text{Estimated range demand}\)

\(\displaystyle \text{Effective demand factor} = \frac{\text{Estimated range demand}} {\text{Connected range load}} \times 100\)

The Effective demand factor is not the same as the Entered demand factor. The entered percentage applies only to Additional range load; the largest range remains fully included. As a result, the overall effective percentage for all connected range load is higher than the percentage entered for the additional ranges.

Calculation Example

Assume the following range loads are included in a residential demand review:

Field	Entered value
Largest range load	12,000 VA
Additional range load	18,000 VA
Entered demand factor	40%

First, calculate the combined connected range load:

\(\displaystyle 12{,}000 \text{VA} + 18{,}000 \text{VA} = 30{,}000 \text{VA}\)

Next, apply the entered 40% factor to Additional range load:

\(\displaystyle 18{,}000 \text{VA} \times 0.40 = 7{,}200 \text{VA}\)

Then add the full largest range load:

\(\displaystyle 12{,}000 \text{VA} + 7{,}200 \text{VA} = \mathbf{19{,}200 \text{VA}}\)

Result	Value
Connected range load	30,000 VA
Estimated range demand	19,200 VA
Diversity allowance	10,800 VA
Effective demand factor	64%

The 19,200 VA result represents the demand value generated by this specific arithmetic method. If the larger residential load calculation later requires current for a 120/240 V single-phase service or feeder review, that conversion must follow the voltage and load-calculation basis used by that workflow. The calculator itself does not perform that conversion or determine conductor ampacity.

Use in Service and Feeder Review

Range demand is commonly one component of a larger calculated load. It may be combined with lighting load, small-appliance and laundry load, HVAC load, water heating, dryers, EV equipment, and other utilization equipment before determining a calculated service or feeder demand.

A diversified range-demand value can influence:

• Service-load or feeder-load calculations.
• Preliminary conductor ampacity review in AWG or kcmil.
• Overcurrent protective device coordination after the complete calculated load is established.
• Panelboard and distribution-equipment loading review.
• Voltage-drop evaluation where the calculated demand current is used as part of the design basis.
• Raceway and conduit layout when final feeder conductor quantities and sizes are selected.

Conductor selection still requires the complete electrical design basis. Ampacity may be affected by terminal rating, insulation temperature rating, ambient-temperature correction factors, adjustment factors for current-carrying conductors, conductor material, installation method, and any applicable voltage-drop design criteria. Raceway fill is also determined from the actual installed conductors, not from a range-demand VA result alone.

Field and Code Limits

This worksheet performs entered-demand arithmetic only. It does not adopt a demand table, choose a demand factor, establish a dwelling-service result, establish a feeder result, or make a final load decision.

Verify separately:

• The actual range ratings and which appliances belong in Largest range load versus Additional range load.
• The source and applicability of the Entered demand factor.
• Whether the project’s governing code, design standard, permit set, utility requirement, or AHJ review permits the selected demand method.
• The complete calculated load before selecting service equipment, feeder conductors, branch-circuit equipment, or overcurrent protection.
• Final conductor ampacity, terminal limitations, conductor adjustment and correction factors, voltage drop, and raceway fill based on the installed conditions.

The result is most useful when a documented residential load workflow already specifies that the largest range is carried at full value and an approved percentage is applied to the combined load of the additional ranges.