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Electrical

Outlets Per Circuit Calculator

Get a planning estimate of how many general-use receptacles a circuit can support, per NEC load rules.

  • Answers as you type
  • Every formula cited
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The circuit's breaker rating.

15A and 20A are the standard breaker sizes for general-purpose receptacle circuits.

General-use receptacle circuits are standard 120V.

This calculator is for standard 120V general-use receptacle circuits, not 240V appliance circuits.

Estimated maximum outlets

10 outlets (estimated maximum)

Medium confidence

This is a general planning guideline based on the NEC's standard per-receptacle load value, not a strict maximum-outlet-count rule — actual safe count depends on what's actually plugged in and used simultaneously, which can be far less than this theoretical maximum.

Safe continuous circuit capacity
1,920 VA
Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

  • NEC 220.14(I) values each general-use receptacle at 180 VA for load calculation purposes; combined with the 80% continuous-load rule, this gives a widely used planning estimate of receptacle count per circuit

Inputs used

Breaker Rating
20 A
Circuit Voltage
120 V

Intermediate steps

Safe continuous circuit capacity
1,920 VA
Final result10 outlets (estimated maximum)

Confidence note: This is a general planning guideline based on the NEC's standard per-receptacle load value, not a strict maximum-outlet-count rule — actual safe count depends on what's actually plugged in and used simultaneously, which can be far less than this theoretical maximum.

What this calculation does not cover

  • IN A DWELLING THIS IS A RULE OF THUMB, NOT A CODE LIMIT. The NEC assigns no load to a general-purpose receptacle outlet in a dwelling unit — lighting and receptacles are covered together by a volt-amps-per-square-foot figure — so there is no code maximum number of outlets on a house circuit. The 180 VA per outlet this uses is the NON-DWELLING rule, and applying it to a house gives a sensible answer for the wrong reason.
  • Counts general-purpose outlets only. Kitchen small-appliance circuits, bathroom, laundry and any dedicated appliance circuit are required to be separate and are not part of this count.
  • A single high-draw appliance can exceed the whole circuit on its own, so the count is meaningless once anything substantial is plugged in. A space heater is most of a 15 A circuit by itself.
  • Says nothing about conductor size, voltage drop over the run, or the arc-fault and ground-fault protection the location requires.
  • Local amendments are common on this subject and can impose a hard maximum where the model code has none.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-09-02 · in the site-wide review of 2026-09-06 · v1.0.1

Regulatory standards & verification citations1
  1. NEC 220.14(I) values each general-use receptacle at 180 VA for load calculation purposes; combined with the 80% continuous-load rule, this gives a widely used planning estimate of receptacle count per circuit

Which documents these citations point at

  • National Electrical Code (NFPA 70) — 220.14(I) (United States)Electrical installations — conductor sizing and protection, load calculation, wiring methods, grounding and working clearances.

A code or standard has force only where a jurisdiction has adopted it, usually with local amendments. This site holds no adoption data for any authority, so check what is in force with the authority where you build. Any section cited above without an edition should be checked against the edition in force where you build. What it would take to know.

Cite this page

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Protection this work requires

  • Stop and check first. Textured ceiling coatings, board behind panels, floor tiles and bitumen adhesive in older buildings — built before asbestos was banned or phased out where you are — can contain asbestos, and drilling or sanding them releases fibres. Do not disturb it — have it sampled first. This is not a job for better PPE.

Tools and safety for this job

To first-fix electrical. Generic types, no brands, no prices.

  • Assume every cable is live until proved dead at the point you will touch, with a two-pole tester you have just proved on a known source.

First-fix electrical: This site does not publish a tool list for electrical installation work. In every market it serves, fixed wiring is either reserved to a registered electrician or notifiable to a building authority, and the failure mode is a fire or an electrocution months later rather than a visibly bad job on the day. The calculator gives you the quantities to discuss and to buy against. The installation is a job for a qualified electrician, and the certificate they issue is the point of them.

Now that you have the number

These guides cover the work this quantity is for — the first ones run this calculator inside the section that raises the question.

  • Setting Out a Kitchen: Clearances, Runs and Servicesuses this calculator

    Fixed modules, a room that is wider at one end, and services that have to be right before the plaster goes on. Setting out a kitchen from one datum.

  • Sizing a Branch Circuituses this calculator

    Size a branch circuit the way it actually gets sized: from the appliance nameplate back to the panel, one constraint at a time.

  • Where Electrics Can Go in a Bathroomuses this calculator

    The zones settled before the boards go on: what may sit over a bath, how far a socket has to stand off, and what the fan, mirror and mat need.

Called something else where you work? Ring final and branch circuits · Fused connection unit — the term in each market, how close the equivalence really is, and the standard that governs it.

How to calculate outlets per circuit in 3 steps

  1. Breaker RatingThe circuit's breaker rating.
  2. Circuit VoltageGeneral-use receptacle circuits are standard 120V.
  3. Estimated maximum outletsThe tool computes the estimated maximum outlets from those figures and shows the formula, its sources, and a confidence rating alongside it.

Frequently asked questions

Does the NEC actually cap the number of outlets per circuit?
For most general-use residential receptacle circuits, no — the NEC doesn't set a hard maximum outlet count (that's more of a commercial/specific-occupancy rule in some cases). This estimate uses the NEC's standard 180 VA-per-receptacle load value as a widely used practical planning guideline.
Why does the actual safe count depend on what's plugged in?
180 VA per outlet assumes typical light general use — a single high-draw appliance (space heater, hair dryer) can use most of a circuit's capacity on its own, regardless of how many outlets are physically wired to that circuit.
Should kitchen and bathroom circuits use this same estimate?
No — kitchen countertop and bathroom receptacle circuits have their own specific NEC requirements (dedicated 20A circuits, GFCI protection, and often limits on what else can share the circuit) beyond this general planning estimate.
Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.