How much does an EV charger add to a load calculation, by charger amps?
Under NEC 2023 the standard method counts an EV charger at the larger of 7,200 VA or its nameplate (220.57) and then adds 25% of it again as a continuous load (230.42(A)(1)). On a 2,000 ft² house that calculates to 120.1 A without a charger, a 40 A charger adds 50.0 A and takes the minimum service from 125 A to 175 A; a 16 A charger is rounded up to 7,200 VA and adds 37.5 A. Under NEC 2026 the charger counts at nameplate with no floor and no 125% adder (120.57, 120.5(E)): the same 40 A charger adds 40.0 A and the 16 A charger only 16.0 A.
Updated September 23, 2026. Numbers on this page are computed by the same engine as the calculators, under NEC 2023 and NEC 2026.
Worked example: 2,000 ft² house with a 40 A charger, NEC 2023 standard method
Calculated per NEC 2023Standard method (Article 220 Part III)
Inputs
| NEC edition | NEC 2023 |
|---|---|
| Floor area | 2,000 ft² |
| Small-appliance circuits | 2 |
| Laundry circuits | 1 |
| Cooking | Electric range 12 kW |
| Clothes dryer | 5,000 VA |
| Appliances fastened in place | Electric water heater 4,500 VA; Dishwasher 1,200 VA |
| Heating | Gas or none (no electric heating load) |
| Air conditioning | 3,600 VA |
| EV charging | EV charger, 40 A at 240 V 9,600 VA |
Result
| Without the charger | 120.1 A28,825 VA; 125 A minimum |
|---|---|
| Calculated load | 40,825 VAfrom 46,400 VA connected |
| Calculated current | 170.1 Aat 240 V |
| Minimum service rating | 175 A240.6(A) standard rating, not less than 100 A |
| Charger contribution | 12,000 VA9,600 VA under 220.57 plus 2,400 VA continuous adder |
| Line item | NEC | Connected | Demand | Basis |
|---|---|---|---|---|
| General lighting and receptacles | 220.41 | 6,000 VA | (in subtotal) | 2,000 ft² × 3 VA/ft² |
| Small-appliance branch circuits | 220.52(A) | 3,000 VA | (in subtotal) | 2 circuits × 1500 VA |
| Laundry branch circuit | 220.52(B) | 1,500 VA | (in subtotal) | 1 circuit × 1500 VA |
| General load after demand factors | Table 220.45 | 10,500 VA | 5,625 VA | 3,000 VA at 100% = 3,000 VA; 7,500 VA at 35% = 2,625 VA |
| Appliances fastened in place | 220.53 | 5,700 VA | 5,700 VA | 2 appliances at 100% |
| Clothes dryers | 220.54 | 5,000 VA | 5,000 VA | 1 × 5,000 VA (nameplate) at 100% (Table 220.54) |
| Cooking appliances | 220.55 | 12,000 VA | 8,000 VA | Column C for 1 unit = 8 kW |
| Electric space heating | 220.60 | — | 0 VA | None |
| Air conditioning | 220.60 | 3,600 VA | 3,600 VA | Larger of no heating and cooling 3,600 VA; cooling governs (220.60) |
| Motors | 220.50 / 430.24 | — | 0 VA | None |
| 25% of largest motor | 220.50 / 430.24 | — | 900 VA | 25% of 3,600 VA (largest motor or compressor) |
| EV supply equipment | 220.57 | 9,600 VA | 9,600 VA | 1 unit at the larger of 7,200 VA or nameplate (220.57) |
| Other loads | 220.14 | — | 0 VA | None |
| 25% of continuous loads | 230.42(A)(1) | — | 2,400 VA | 25% of 9,600 VA continuous |
The 9,600 VA charger enters at nameplate because it exceeds the 7,200 VA floor, and the 230.42(A)(1) row adds 25% of it. Together they move the house from 120.1 A to 170.1 A, so the minimum service becomes 175 A.
Six charger sizes, both editions
Calculated per NEC 2023Standard method, NEC 2023 (Article 220 Part III) and NEC 2026 (Article 120 Part III)
Inputs
| House without a charger | NEC 2023: 120.1 A · NEC 2026: 117.2 A |
|---|---|
| 2023 rule | 220.57: larger of 7,200 VA or nameplate; EVSE is continuous, so 230.42(A)(1) adds 25% |
| 2026 rule | 120.57: nameplate (7,200 VA only if no nameplate); 120.5(E) removes the 125% adder from load calculations |
Result
| 16 A charger (3,840 VA nameplate) | 2023: 157.6 A → 175 A2026: 133.2 A → 150 A · counted at 7,200 VA / 3,840 VA |
|---|---|
| 24 A charger (5,760 VA nameplate) | 2023: 157.6 A → 175 A2026: 141.2 A → 150 A · counted at 7,200 VA / 5,760 VA |
| 32 A charger (7,680 VA nameplate) | 2023: 160.1 A → 175 A2026: 149.2 A → 150 A · counted at 7,680 VA / 7,680 VA |
| 40 A charger (9,600 VA nameplate) | 2023: 170.1 A → 175 A2026: 157.2 A → 175 A · counted at 9,600 VA / 9,600 VA |
| 48 A charger (11,520 VA nameplate) | 2023: 180.1 A → 200 A2026: 165.2 A → 175 A · counted at 11,520 VA / 11,520 VA |
| 80 A charger (19,200 VA nameplate) | 2023: 220.1 A → 225 A2026: 197.2 A → 200 A · counted at 19,200 VA / 19,200 VA |
The 2023 floor means a 16 A and a 24 A charger cost the same 7,200 VA in the calculation; 2026 prices them at nameplate. From 32 A upward the two editions differ only by the 2023 continuous adder and the lower 2026 lighting load.
Where the charger lands in the standard method
EV supply equipment has its own line since NEC 2023: 220.57 in the 2023 code, 120.57 after the 2026 renumbering. It is not an "other load" and it is not a motor. Because charging runs for hours, EVSE is a continuous load (625.41), and under NEC 2023 the 230.42(A)(1) rule adds 25% of continuous loads when sizing the service conductors, which the calculator shows as its own row so a reviewer can see it.
NEC 2026 changed both halves. 120.57 takes the nameplate rating whenever one is available, using 7,200 VA only as a fallback, and 120.5(E) states that the 125% continuous factor is not applied in load calculations at all. The charger still needs a 125% branch circuit, but the service calculation no longer carries that margin twice.
Reading the table
This house sits at 120.1 A before any charger under NEC 2023, a 125 A minimum that in practice means a 150 A service. Every charger from 16 A up pushes it past 150 A, and the 48 A charger pushes it to 180.1 A, a 200 A minimum. An 80 A charger is a 19,200 VA load that almost no dwelling service absorbs without load management.
The 2026 column is consistently lower, partly from the EVSE rule and partly because 120.41 reduced the general lighting load from 3 to 2 VA per square foot. On this house the 40 A charger lands at a 175 A minimum under both editions, but the 32 A charger stays on 150 A only under 2026.
What to tell the customer
Charger size is the one input the customer controls. A 32 A charger delivers about 25 miles of range per hour, enough to refill a typical commute overnight several times over, and on this house it is the difference between one service size and the next. When the calculation is tight, an energy-management system under Article 750 lets the charger throttle instead of the service growing.
Frequently asked questions
- Do I use the breaker size or the charger’s output for the nameplate?
- The charger’s rated output current at 240 V. A charger set to 40 A output is 9,600 VA and sits on a 50 A breaker; the 50 A is the branch-circuit size, not the load.
- Does a hardwired charger count differently from a plug-in one?
- No. Both are EVSE under 220.57 / 120.57 at their rated output. A NEMA 14-50 receptacle installed for a future charger with no equipment yet is where the 7,200 VA fallback matters most.
- Two chargers?
- Each unit is counted, so two 40 A chargers add 19,200 VA under either edition unless an energy-management system limits their combined draw, which the code then allows you to use as the load.
- How does the optional method treat EVSE?
- NEC 2023 220.82(B)(3)a takes the charger at nameplate inside the general load, where most of it falls in the 40% tier. NEC 2026 120.82(D) moves it outside the tiers at 100% of the 120.57 value, so the optional method got stricter for EVSE while the standard method got looser.
Related questions
- Can a 100 A panel handle an EV charger?Often yes, if the charger is sized to the house. A worked NEC 220.83 calculation on a 1,400 ft² house, gas-heated and then all-electric, shows which Level 2 charger sizes fit a 100 A service.
- What changed in dwelling load calculations between NEC 2023 and NEC 2026?One 2,200 ft² house calculated under both editions and both methods: Article 220 becomes 120, lighting drops to 2 VA/ft², the 125% continuous adder goes, EVSE moves to nameplate, and the optional method’s tiers change.
More for electricians: NEC 2023 load calculations you can hand to an inspector · all answers