Home › Unit Converters › Volts to Amps Converter

Volts to Amps Converter

Find the current a load draws from its voltage. Enter the power in watts or the resistance in ohms, choose DC, single-phase or three-phase AC and set the power factor; the amps update as you type and the working is shown below.

Last updated: October 24, 2026

VoltsFrom

AmpsTo

Calculate using

Power (W)

Current type

Power factor (AC)

Decimal places

Step-by-step calculation

How to use the Volts to Amps Converter

Type the voltage in the Volts box (for example 120).
Choose the method: power in watts if you know the load's wattage, or resistance in ohms for a resistor or heating element.
Set the current type (DC, single-phase or three-phase AC) and the power factor for AC loads.
Read the amps instantly, or type in the Amps box or press ⇄ to work out volts instead.
Check the working in the step-by-step box and copy the result.

Volts to amps formulas

Amps = Watts ÷ Volts or Amps = Volts ÷ Ohms

Voltage alone does not tell you the current. You also need either the power the load draws or its resistance:

Circuit	Known values	Formula	Example
DC	watts, volts	`I = P ÷ V`	60 W ÷ 12 V = 5 A
AC single-phase	watts, volts, PF	`I = P ÷ (V × PF)`	1,500 W ÷ (120 V × 0.9) = 13.89 A
AC three-phase	watts, line-to-line volts, PF	`I = P ÷ (√3 × V × PF)`	10,000 W ÷ (1.732 × 480 V × 0.85) = 14.15 A
Any resistive load	volts, ohms	`I = V ÷ R`	12 V ÷ 4 Ω = 3 A

Reverse formulas: V = P ÷ I (DC), V = P ÷ (I × PF) (single-phase), V = P ÷ (√3 × I × PF) (three-phase), and V = I × R.

With a fixed wattage, higher voltage means lower current: the same 1,200 W heater draws 10 A at 120 V but only 5 A at 240 V. With a fixed resistance it is the opposite: raising the voltage raises the current.

Power factor and three-phase, briefly

Power factor (PF) is the ratio of real power (watts) to apparent power (volt-amps). Heaters, incandescent bulbs and kettles are close to 1. Motors, compressors and older fluorescent ballasts often sit between 0.7 and 0.9, so they draw more current than watts ÷ volts suggests. If the nameplate lists VA or kVA instead of watts, use PF = 1 with that VA figure.

Three-phase systems spread the load across three conductors, so the current in each line is the power divided by √3 (about 1.732) times the line-to-line voltage and the PF. Common line-to-line voltages are 208 V and 480 V in the US and 400 V in Europe.

Sizing a breaker: for loads that run three hours or more, US practice keeps continuous current at no more than 80% of the breaker rating, which is why the converter shows current ÷ 0.8. Always confirm wire and breaker sizes against your local electrical code or a licensed electrician.

Volts to amps table at 1,200 W (1–100)

The tables use the power or resistance set in the converter (default 1,200 W, DC or PF 1). Click any row to load it.

Volts to amps at 1200 W AC

Volts	Amps
1 V	1,200 A
2 V	600 A
3 V	400 A
4 V	300 A
5 V	240 A
6 V	200 A
7 V	171.43 A
8 V	150 A
9 V	133.33 A
10 V	120 A
11 V	109.09 A
12 V	100 A
13 V	92.308 A
14 V	85.714 A
15 V	80 A
16 V	75 A
17 V	70.588 A
18 V	66.667 A
19 V	63.158 A
20 V	60 A
21 V	57.143 A
22 V	54.545 A
23 V	52.174 A
24 V	50 A
25 V	48 A
26 V	46.154 A
27 V	44.444 A
28 V	42.857 A
29 V	41.379 A
30 V	40 A
31 V	38.71 A
32 V	37.5 A
33 V	36.364 A
34 V	35.294 A
35 V	34.286 A
36 V	33.333 A
37 V	32.432 A
38 V	31.579 A
39 V	30.769 A
40 V	30 A
41 V	29.268 A
42 V	28.571 A
43 V	27.907 A
44 V	27.273 A
45 V	26.667 A
46 V	26.087 A
47 V	25.532 A
48 V	25 A
49 V	24.49 A
50 V	24 A
51 V	23.529 A
52 V	23.077 A
53 V	22.642 A
54 V	22.222 A
55 V	21.818 A
56 V	21.429 A
57 V	21.053 A
58 V	20.69 A
59 V	20.339 A
60 V	20 A
61 V	19.672 A
62 V	19.355 A
63 V	19.048 A
64 V	18.75 A
65 V	18.462 A
66 V	18.182 A
67 V	17.91 A
68 V	17.647 A
69 V	17.391 A
70 V	17.143 A
71 V	16.901 A
72 V	16.667 A
73 V	16.438 A
74 V	16.216 A
75 V	16 A
76 V	15.789 A
77 V	15.584 A
78 V	15.385 A
79 V	15.19 A
80 V	15 A
81 V	14.815 A
82 V	14.634 A
83 V	14.458 A
84 V	14.286 A
85 V	14.118 A
86 V	13.953 A
87 V	13.793 A
88 V	13.636 A
89 V	13.483 A
90 V	13.333 A
91 V	13.187 A
92 V	13.043 A
93 V	12.903 A
94 V	12.766 A
95 V	12.632 A
96 V	12.5 A
97 V	12.371 A
98 V	12.245 A
99 V	12.121 A
100 V	12 A

Amps to volts at 1200 W AC

Amps	Volts
1 A	1,200 V
2 A	600 V
3 A	400 V
4 A	300 V
5 A	240 V
6 A	200 V
7 A	171.43 V
8 A	150 V
9 A	133.33 V
10 A	120 V
11 A	109.09 V
12 A	100 V
13 A	92.308 V
14 A	85.714 V
15 A	80 V
16 A	75 V
17 A	70.588 V
18 A	66.667 V
19 A	63.158 V
20 A	60 V
21 A	57.143 V
22 A	54.545 V
23 A	52.174 V
24 A	50 V
25 A	48 V
26 A	46.154 V
27 A	44.444 V
28 A	42.857 V
29 A	41.379 V
30 A	40 V
31 A	38.71 V
32 A	37.5 V
33 A	36.364 V
34 A	35.294 V
35 A	34.286 V
36 A	33.333 V
37 A	32.432 V
38 A	31.579 V
39 A	30.769 V
40 A	30 V
41 A	29.268 V
42 A	28.571 V
43 A	27.907 V
44 A	27.273 V
45 A	26.667 V
46 A	26.087 V
47 A	25.532 V
48 A	25 V
49 A	24.49 V
50 A	24 V
51 A	23.529 V
52 A	23.077 V
53 A	22.642 V
54 A	22.222 V
55 A	21.818 V
56 A	21.429 V
57 A	21.053 V
58 A	20.69 V
59 A	20.339 V
60 A	20 V
61 A	19.672 V
62 A	19.355 V
63 A	19.048 V
64 A	18.75 V
65 A	18.462 V
66 A	18.182 V
67 A	17.91 V
68 A	17.647 V
69 A	17.391 V
70 A	17.143 V
71 A	16.901 V
72 A	16.667 V
73 A	16.438 V
74 A	16.216 V
75 A	16 V
76 A	15.789 V
77 A	15.584 V
78 A	15.385 V
79 A	15.19 V
80 A	15 V
81 A	14.815 V
82 A	14.634 V
83 A	14.458 V
84 A	14.286 V
85 A	14.118 V
86 A	13.953 V
87 A	13.793 V
88 A	13.636 V
89 A	13.483 V
90 A	13.333 V
91 A	13.187 V
92 A	13.043 V
93 A	12.903 V
94 A	12.766 V
95 A	12.632 V
96 A	12.5 V
97 A	12.371 V
98 A	12.245 V
99 A	12.121 V
100 A	12 V

Common voltages

Volts	Amps	Example
1.5 V	800 A	AA battery
3.7 V	324.3 A	Li-ion cell
5 V	240 A	USB port
12 V	100 A	Car / RV battery
24 V	50 A	24 V system
48 V	25 A	48 V solar / telecom
120 V	10 A	US outlet
208 V	5.769 A	US commercial 3-phase
230 V	5.217 A	EU / UK outlet
240 V	5 A	US dryer / range
277 V	4.332 A	US lighting circuit
400 V	3 A	EU 3-phase
480 V	2.5 A	US industrial 3-phase

About volts and amps

Volt (V). The SI unit of electric potential difference, the push that drives charge around a circuit. One volt across one ohm drives one amp.

Ampere (A). The SI unit of electric current, the rate at which charge flows: one amp is one coulomb per second. Current, not voltage, decides how thick a wire must be and which breaker or fuse protects it.

Frequently asked questions

How do you convert volts to amps?

You need a second value. With power: amps = watts ÷ volts (DC), or watts ÷ (volts × power factor) for single-phase AC. With resistance: amps = volts ÷ ohms. For example, 1,200 W at 120 V draws 10 A.

How many amps is 120 volts?

It depends on the load. A 60 W lamp at 120 V draws 0.5 A, a 1,500 W space heater draws 12.5 A, and a 1,800 W kettle draws 15 A.

How many amps is 240 volts?

Again it depends on the wattage: a 4,800 W water heater element at 240 V draws 20 A, and a 7,200 W EV charger draws 30 A.

How do I calculate three-phase amps from volts?

Use I = P ÷ (√3 × V × PF), where V is the line-to-line voltage. A 10 kW load at 480 V with power factor 0.85 draws 10,000 ÷ (1.732 × 480 × 0.85) = 14.15 A per line.

What is the volts to amps formula with ohms?

Ohm's law gives I = V ÷ R. 12 volts across a 4 ohm resistor drives 3 amps, and the resistor dissipates V² ÷ R = 36 watts.

Why does power factor increase the current?

Inductive loads such as motors shift current out of step with voltage, so some current does no useful work. Dividing by a power factor below 1 accounts for that extra current; resistive loads have a power factor of 1.

Are all the tools on FreeToolCabin tested for quality and accuracy?

Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.

Related tools

See all 52 Temperature, Energy & Power Converters →