swap_horiz Looking to convert 23.99A at 120V back to watts?

How Many Amps Is 2,879 Watts at 120V?

At 120V, 2,879 watts converts to 23.99 amps using the AC single-phase formula (Amps = Watts ÷ (V × PF)) at PF 1.0 for a resistive load. AC resistive at PF 1.0 and the DC baseline land on the same number at this voltage.

At 23.99A, the NEC 210.19(A) continuous-load sizing math (125% of the load, equivalently 80% of the breaker rating) points to a 30A breaker as the smallest standard size that covers this load continuously. A 25A breaker is the smallest standard size the raw current fits under, but it is non-continuous-only at this load.

2,879 watts at 120V

23.99 Amps

2,879 watts equals 23.99 amps at 120 volts (AC single-phase, PF 1.0 resistive)

DC23.99 A

Try: 3,000W at 120V 2,700W at 120V 2,500W at 120V 2,400W at 120V

Watts

Volts

Amps (AC 1Φ, PF 1.0)

23.99

Assumes an AC single-phase resistive load at PF 1.0. Typing a commercial L-L voltage (208/400/480V) re-routes the result to three-phase; 277V stays on single-phase because it's the L-N lighting leg of a 480Y/277V wye; 12/24V re-routes to DC.

Formulas

DC: Watts to Amps

I_(A) = P_(W) ÷ V_(V)

2,879 ÷ 120 = 23.99 A

AC Single Phase (PF = 0.85)

I_(A) = P_(W) ÷ (PF × V_(V))

2,879 ÷ (0.85 × 120) = 2,879 ÷ 102 = 28.23 A

Circuit Sizing

Breaker Sizing

NEC 240.6(A) standard ampere ratings for branch-circuit and feeder breakers start at 15, 20, 25, 30, 35, 40, 45, and 50A and continue at 60A and above for feeder and large-appliance circuits. At 23.99A, the smallest standard breaker the raw current fits under is 25A, but that breaker only covers 25A non-continuously; NEC 210.19(A) requires conductor and OCP sized at 125% of any continuous load (equivalently 80% of breaker rating), so for a continuous load the smallest compliant breaker is 30A. Final selection still depends on the equipment nameplate, whether the load is continuous, conductor ampacity, and local code.

Breaker Size	Max Continuous Load (80%)	Status for 23.99A
15A	12A	Too small
20A	16A	Too small
25A	20A	Non-continuous only
30A	24A	OK for continuous
35A	28A	OK for continuous
40A	32A	OK for continuous
45A	36A	OK for continuous
50A	40A	OK for continuous

Energy Cost

Running 2,879W costs approximately $0.49 per hour at the US average rate of $0.17/kWh (rates last reviewed April 2026). That is $3.92 for 8 hours or about $117.46 per month. See detailed cost breakdown.

AC Conversion Detail

The DC baseline for 2,879W at 120V is 23.99A. On an AC circuit with a power factor of 0.85, the current rises to 28.23A because reactive current flows alongside the real-power current.

Circuit Type	Formula	Result
DC	2,879 ÷ 120	23.99 A
AC Single Phase (PF 0.85)	2,879 ÷ (120 × 0.85)	28.23 A

Power Factor Reference

Power factor is the main reason 2,879W draws more current on AC than DC. At PF 1.0 (pure resistive, like a heater), the load pulls 23.99A at 120V on the single-phase basis the rest of the page uses. At PF 0.80 (typical induction motor), the same 2,879W pulls 29.99A. That is an extra 6A just to overcome the reactive component. Use the typical values below as a starting point, not for precise engineering calculations.

Load Type	Typical PF	2,879W at 120V (single-phase)
Resistive (heaters, incandescent)	1	23.99 A
Fluorescent lamps	0.95	25.25 A
LED lighting	0.9	26.66 A
Synchronous motors	0.9	26.66 A
Typical mixed loads	0.85	28.23 A
Induction motors (full load)	0.8	29.99 A
Computers (without PFC)	0.65	36.91 A
Induction motors (no load)	0.35	68.55 A

Same Wattage, Other Voltages

bolt2,879W at 12V = 239.92ADC bolt2,879W at 24V = 119.96ADC bolt2,879W at 100V = 28.79A1Φ, PF 1.0 bolt2,879W at 208V = 9.4A3Φ per line, PF 0.85 bolt2,879W at 220V = 13.09A1Φ, PF 1.0 bolt2,879W at 230V = 12.52A1Φ, PF 1.0 bolt2,879W at 240V = 12A1Φ, PF 1.0 bolt2,879W at 277V = 10.39A1Φ, PF 1.0 bolt2,879W at 400V = 4.89A3Φ per line, PF 0.85 bolt2,879W at 460V = 4.25A3Φ per line, PF 0.85 bolt2,879W at 480V = 4.07A3Φ per line, PF 0.85 bolt2,879W at 575V = 3.4A3Φ per line, PF 0.85

swap_horiz 24A to watts at 120V payments 2,879W running cost cable Wire size for 23.99A at 120V electrical_services 2.88 kW to amps science Ohm's law: 120V & 24A functions Watts to amps formula

Other Wattages at 120V

Watts	AC 1Φ Amps PF 1.0 resistive	AC 1Φ Amps PF 0.85 motor
900W	7.5A	8.82A
1,000W	8.33A	9.8A
1,100W	9.17A	10.78A
1,200W	10A	11.76A
1,300W	10.83A	12.75A
1,400W	11.67A	13.73A
1,500W	12.5A	14.71A
1,600W	13.33A	15.69A
1,700W	14.17A	16.67A
1,800W	15A	17.65A
1,900W	15.83A	18.63A
2,000W	16.67A	19.61A
2,200W	18.33A	21.57A
2,400W	20A	23.53A
2,500W	20.83A	24.51A
2,700W	22.5A	26.47A
3,000W	25A	29.41A
3,500W	29.17A	34.31A
4,000W	33.33A	39.22A
4,500W	37.5A	44.12A

Frequently Asked Questions

How many amps is 2,879W at 120V? expand_more

2,879W at 120V draws 23.99 amps on AC single-phase at PF 1.0 (resistive). For comparison at the same voltage: 23.99A on DC, 28.23A on AC single-phase at PF 0.85. Actual current depends on the load's power factor.

Should I run 2,879W on a 15A circuit or a 20A circuit? expand_more

At 23.99A the load sits past the 80% continuous-load figure of a 120V/20A circuit (1,920W). A dedicated 240V circuit is the practical option for sustained operation.

What power factor should I use for 2,879W calculations? expand_more

For resistive loads (heaters, incandescent bulbs, electric kettles) use PF 1.0. For motors, use 0.80. For mixed office/residential use 0.85. For computers and LED arrays the effective PF can be 0.65 or lower. Power factor only applies to AC.

Why does a 2,879W resistive heater draw fewer amps than a 2,879W motor at 120V? expand_more

Resistive loads like space heaters and toasters have a power factor of 1.0, so 2,879W at 120V on a single-phase AC basis draws 23.99A. An induction motor at the same wattage has a PF around 0.80, drawing 29.99A on the same basis. The extra current is reactive, it does no real work but still has to flow through the conductors and breaker.

What is the 80% continuous load rule for 2,879W? expand_more

NEC 210.19(A) sizes the conductor and overcurrent device at not less than 125% of any continuous load (a load that runs three hours or more), equivalently 80% of the breaker rating. At 23.99A (the current the branch conductors actually carry on AC single-phase at PF 1.0 (resistive)), the minimum breaker that satisfies this is 30A under typical assumptions. Brief non-continuous use can run closer to the full breaker rating, but space heaters, EV chargers, and long-running appliances should be sized for the continuous case.

This calculator provides estimates for reference purposes only. Always consult a licensed electrician and verify compliance with the National Electrical Code (NEC) and local electrical codes before performing any electrical work.