Range & Cooking Appliance Branch-Circuit Calculator
Find the minimum branch-circuit rating for a household range, wall oven, or cooktop under NEC 210.19(A)(3). The tool takes the Table 220.55 demand for the appliance, applies the 40 A floor that a range of 8¾ kW or more must meet, and reports the conductor ampacity to carry into the wire-size step.
How to use this calculator
- Pick the appliance: a freestanding range, a single wall oven or cooktop, or a cooktop plus up to two ovens sharing one circuit in the same room.
- Enter the nameplate rating in kW. For the shared-circuit case, add the cooktop and ovens and enter the combined kW.
- Choose the circuit voltage. Most household ranges are 240 V; apartment ranges on a 208Y/120 system use 208 V.
- Read the minimum branch-circuit rating and the conductor ampacity. The result also shows the Table 220.55 demand it is based on and whether the 40 A range floor governed.
- Take the conductor ampacity to the Wire Size or Wire Ampacity calculator to pick the actual AWG with your temperature and conductor-count conditions.
NEC reference
This tool applies the National Electrical Code (NEC) 2020, Section 210.19(A)(3), "Household Ranges and Cooking Appliances." The branch-circuit conductors must have an ampacity not less than the branch-circuit rating and not less than the maximum load to be served, and the branch-circuit rating is permitted to be based on Table 220.55. The minimum branch-circuit rating for ranges of 8¾ kW or more is 40 amperes. Exception No. 1 allows tap conductors of at least 20 A from a 50 A branch circuit to serve separate ovens and cooktops; Exception No. 2 allows the neutral of a 3-wire circuit, sized on the Column C demand, to be 70% of the branch rating but not smaller than 10 AWG. The demand basis comes from Table 220.55, Column C with Note 1, matching the Range / Cooktop Demand Load Calculator. These rules are unchanged across the 2017, 2020, and 2023 editions.
Results are for reference only. Verify against the applicable adopted edition of the NEC and consult a licensed electrician for code compliance.
Common ranges and their minimum circuits
| Range rating | Table 220.55 demand | Demand at 240 V | Minimum branch circuit |
|---|---|---|---|
| 8 kW | 8 kW | 33.3 A | 35 A |
| 8¾ kW | 8 kW | 33.3 A | 40 A |
| 12 kW | 8 kW | 33.3 A | 40 A |
| 16 kW | 9.6 kW | 40.0 A | 40 A |
| 24 kW | 12.8 kW | 53.3 A | 60 A |
| 27 kW | 14 kW | 58.3 A | 60 A |
The demand is Table 220.55 Column C for one appliance (8 kW for a range not over 12 kW), increased 5% per kW above 12 kW by Note 1. The 40 A floor from 210.19(A)(3) governs every range from 8¾ kW up until the demand itself passes 40 A.
The nameplate is not the branch-circuit load
The single most common mistake with a range circuit is sizing it to the nameplate. A 12 kW range is 50 amperes at 240 volts on paper, but 210.19(A)(3) lets the branch-circuit rating be based on Table 220.55, which recognizes that the oven, broiler, and surface elements do not all run at full power at once. Column C puts the maximum demand of a single range not over 12 kW at 8 kW, about 33 amperes, and the code then sets a 40 A minimum so the circuit is never sized below a practical floor. That is why the standard freestanding range lands on a 40 A breaker with an 8 AWG copper conductor.
Larger commercial-style ranges do exceed 40 A. Note 1 adds 5% to the Column C demand for every kilowatt over 12, so a 24 kW range carries a 12.8 kW demand, about 53 amperes, and needs a 60 A circuit. This tool applies Note 1 the same way the Range / Cooktop Demand Load Calculator does, so the two never disagree.
Ovens, cooktops, and shared circuits
A single wall oven or a single counter-mounted cooktop is taken at its nameplate rating under Table 220.55 Note 4, and because it is not a range, the 40 A floor does not apply. Size the circuit to the load: a 6 kW cooktop is 25 amperes, so a 30 A circuit is enough. When a cooktop and not more than two wall ovens are supplied by one branch circuit in the same room, Note 4 permits adding their nameplate ratings and treating the group as a single range, so the Column C demand and the 40 A minimum both come back into play.
Feeding those separate appliances from one circuit is where the tap rules matter. Exception No. 1 to 210.19(A)(3) permits tap conductors of at least 20 A from a 50 A branch circuit to reach each oven or cooktop, provided each tap is only as long as needed to service its appliance. The factory pigtail supplied with the appliance counts as a tap under this exception.
This tool sizes the circuit rating, not the wire gauge
The result gives the minimum branch-circuit ampere rating and the conductor ampacity that rating demands, but it deliberately stops short of picking an AWG. Choosing the conductor needs Table 310.16, the 110.14(C) termination limit, ambient and conductor-count derating, and the 240.4 conductor-protection rules. Carry the conductor ampacity this tool returns into the Wire Size or Wire Ampacity calculator to finish that step. For the whole-dwelling service or feeder calculation, the range demand feeds the Electrical Load Calculator, not this branch-circuit tool.
Frequently asked questions
Is a 40 amp circuit always enough for a range?
For most household ranges, yes. Any range from 8¾ kW up to about 16 kW lands on the 40 A minimum. Above roughly 16 kW the Table 220.55 demand climbs past 40 amperes and the circuit grows: a 24 kW range needs 60 A. Enter the exact rating to see where a specific range falls.
What wire size goes with a 40 amp range circuit?
The conductor must have an ampacity of at least 40 amperes, which is 8 AWG copper at the 60 degrees C column typical of a 40 A residential range circuit. This tool reports the required ampacity; confirm the AWG for your terminations and conditions with the Wire Size calculator.
Does this apply to the service or feeder calculation?
No. This is the branch-circuit rating for one appliance. The demand a range adds to the whole-dwelling service or feeder is a separate Article 220 step; use the Electrical Load Calculator or the Range / Cooktop Demand Load Calculator for that.
Which NEC edition does this use?
NEC 2020. The 210.19(A)(3) rule, the 40 A floor, Table 220.55 Column C, and both exceptions are unchanged across the 2017, 2020, and 2023 editions, so the result is the same under any of them. Always confirm the edition your jurisdiction has adopted.
Related calculators
- Range / Cooktop Demand Load Calculator: the Table 220.55 demand in kW for feeder and service calculations, the number this tool builds on.
- Wire Size Calculator: turn the conductor ampacity from this tool into an actual AWG with your conditions.
- Breaker Size Calculator: size a general-use breaker and conductor together from a load, with the 240.4 limits applied.
- Electrical Load Calculator: the whole-dwelling service load, where the range demand is one line among many.
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