How Many Outlets on a 20-Amp Circuit? (The Real NEC Answer)
NEC 220.14 · Receptacles · Updated 2026-07-11
The most-asked question in residential wiring has a surprising answer: for dwelling receptacle circuits, the NEC sets no maximum outlet count. The 10-or-13 numbers you've heard come from the commercial rule.
Here's where each number actually comes from - and what to use in practice.
The commercial math: 180 VA per receptacle
In non-dwelling installations, NEC 220.14(I) assigns every receptacle strap a load of 180 VA. Divide the circuit's capacity by 180 and you get the ceiling:
| Circuit | Capacity | ÷ 180 VA | Max receptacles |
|---|---|---|---|
| 15 A × 120 V | 1,800 VA | 10.0 | 10 |
| 20 A × 120 V | 2,400 VA | 13.3 | 13 |
Why homes are different
Dwelling receptacle outlets are covered by the general lighting load - 3 VA per square foot under 220.41 - not counted per-strap. The code assumes you won't run hair dryers in every bedroom outlet simultaneously, so it regulates total load, not outlet count. That's why an electrician can legally put a whole bedroom's receptacles and lights on one circuit.
- The field rule of thumb: 8-10 outlets per circuit. Not code - just good practice that keeps nuisance trips away and spreads risk.
- Some circuits are mandatory and dedicated: two 20 A small-appliance circuits for the kitchen counters, one 20 A bathroom circuit, one 20 A laundry circuit (210.11(C)) - and counter receptacles can't share with lights.
- #12 copper wire is the conductor for a 20 A circuit - #14 is limited to 15 A by 240.4(D).
- Local amendments can add limits. A few jurisdictions do cap dwelling outlets per circuit - your AHJ wins.
Loads, wire sizes, and citations - calculated, not guessed. Conduit Fill & Bending Calc runs dwelling load calcs, wire sizing, and 14 more NEC calculators offline. Free on the App Store. Download Conduit Fill & Bending Calc on the App Store.
Frequently asked questions
How many outlets can I put on a 20-amp circuit in a house?
The NEC sets no maximum for dwelling receptacle circuits - they're covered by the 3 VA/sq ft general lighting load, not a per-outlet count. The common field practice is 8-10 outlets; commercial installations are capped at 13 by the 180 VA rule.
What wire do I use for a 20-amp circuit?
#12 copper minimum. #14 copper is limited to 15 A overcurrent protection by NEC 240.4(D), no matter what the ampacity table says.
Can lights and outlets share a 20-amp circuit?
In most dwelling rooms, yes. The exceptions are the dedicated required circuits: kitchen small-appliance, bathroom, and laundry 20 A circuits serve only their receptacles - no lighting.
How many outlets on a 15-amp circuit?
Same logic: no hard dwelling limit, 10 receptacles commercial (1,800 VA ÷ 180). The 8-10 rule of thumb usually becomes 6-8 for 15 A circuits in practice.