Volts to Amperes – Calculator, how to convert, examples, table and formula

The conversion of Volts to Amperes is very simple and you can do it with this tool.

We explain that formula is used in the calculation, also how to convert from Volts to Amperes in only 3 steps , we show some examples and a table with the main conversions from volts to Amperes.

To facilitate the calculations we show the most common power factors of different constructions, appliances and motors.

Formula to convert, pass, calculate and transform from Volts to Amperes, single-phase, two-phase and three-phase:


  • kW = kilowatt or kilowatts.
  • L-N = Volts line to neutral.
  • L-L = Volts line to line.
  • AC1Ø = Current / Amps 1 phase.
  • AC2Ø = Current / Amps 2 phase.
  • AC3Ø = Current / Amps 3 phase.
  • DC = Direct current.
  • FP = Power factor. 


How to convert from Volts to Amperes in only 3 steps:

How to convert from Volts to Amperes in only 3 stepsHow to convert from Volts to Amperes in only 3 steps

To change from volts to amperes, you only have to multiply and divide the variables shown in the formula, according to the type of DC or AC current and the number of phases.

Step 1:

Multiply the kW by 1000. For example, if you have a drill that consumes 0.9kW, you must multiply 0.9 × 1000, getting 900, (0.9 × 1000) = 900.

Step 2:

Multiply the corresponding voltage according to the formula by the power factor and by the root of three, as long as the equipment is three-phase. For example, if I have a three-phase 480V drill with a power factor of 0.87, I multiply 480 × 0.87x√3 and get 723.3 ((480 × 0.87x√3) = 723.3.) .

Step 3:

Divide step 1 between step 2. (0.9 × 1000) / (480 × 0.87x√3) and get 1.24A.


Examples of conversions from Volts to Amperes:

Example 1:

A single-phase LED luminaire – alternating current (AC) of 0.33kW, with a neutral line voltage of 127V and line line of 208V, a power factor of 0.93, how many monophasic amperes does the LED luminaire have ?.

Answer: // To know the answer you must multiply the kW by 1000 (0.33kWx1000), and then divide the result between the voltage by the power factor as indicated by the formula in single-phase systems: 0.33kWx1000 / 127 × 0, 93 = 2.54A.

Example 2:

A three phase blender (AC) consumes 4.7kW, has a linear line voltage of 460V and a power factor of 0.87, how can I convert from Volts to three phase amps ?.

Answer: // Initially what you must do is multiply the power in kW by 1000 (4.7kWx1000), which will result in 4700, then you must divide this result between the multiplication of the voltage by the power factor and root of three, as follows: 460Vx0.87x√3 = 693.1, finally divide 4700 / 693.1 = 6.78A.

Example 3:

There is a UPS with a power of 2.9kW bifasic (AC), a line-to-line voltage of 208V and a neutral line voltage of 120V, with a power factor of 0.95, which amperage has the UPS ?.

Answer: // You must multiply the kW per thousand, in the following way: 2.9kWx1000 and then divide the above between the multiplication of the voltage, the power factor and two, as indicated by the biphasic formula, being as follows : (2,9kWx1000) / (2x120x0,95), which will result in: 12.72A.


Table of Volts to three-phase amperes, conversion, equivalence, transformation (kW = 5, Fp = 0.8, AC, 3F):

How many Volts to three phase Amps are:Equivalence of Volts to Amperes
120 Volts30.07 Amps
127 Volts28.41 Amps
220 Volts16.40 Amps
240 Volts15,04 Amps
277 Volts13.03 Amps
440 Volts8.20 Amps
600 Volts6.01 Amps
1000 Volts3.61 Amps
1500 Volts2.41 Amps
4160 Volts0.87 Amps
5000 Volts0.72 Amps
7620 Volts0.47 Amps
8000 Volts0.45 Amps
11400 Volts0.32 Amps
13200 Volts0.27 Amps
15000 Volts0.24 Amps
22000 Volts0.16 Amps
25000 Volts0.14 Amps
30000 Volts0.12 Amps
34500 Volts0.10 Amps
35000 Volts0.10 Amps
40000 Volts0.090 Amps
46000 Volts0.078 Amps
57500 Volts0.063 Amps
66000 Volts0.055 Amps
69000 Volts0.052 Amps
115000 Volts0.031 Amps
138000 Volts0.026 Amps
230000 Volts0.016 Amps

Note : The changes of Volts to amperes of the previous table were made taking into account a power factor of 0.8, a power of 5kW AC three phase. For different variables you should use the calculator that appears at the beginning.


How to use the Calculator from Volts to Amperes:

The first thing you must do is enter the Volts you want to convert, then choose the AC or DC current, it is important that once you choose the current you review the data shown on the left of the table, these change according to the current type chosen, then choose the number of phases: 1,2 or 3, this option will only be available if AC current is chosen.

Then enter the power , finally the power factor and then click on calculate to finish or restart to enter new values.


Typical power factor for engines, constructions and appliances.

Typical Un-improved Power Factor by Industry:

IndustryPower Factor
Auto Parts0.75-0.80
Coal Mine0.65-0.80
Machine Manufacturing0.60-0.65
Metalworking 0.65-0.70
Office Building0.80-0.90
Oil field Pumping0.40-0.60
Paint Manufacturing0.65-0.70
Steel Works0.65-0.80
Tool, dies, jigs industry0.65-0.75


Typical power factor of common household electronics:

Electronics devicePower Factor
Magnavox Projection TV – standby0,37
Samsung 70″ 3D Bluray0,48
Digital Picture Frame0,52
ViewSonic Monitor0,5
Dell Monitor0,55
Magnavox Projection TV0,58
Digital Picture Frame0,6
Digital Picture Frame0,62
Digital Picture Frame0,65
Philips 52″ Projection TV0,65
Digital Picture Frame0,73
Xbox Kinect0,75
Xbox 3600,78
Sharp Aquos 3D TV0,95
PS3 Move0,98
Playstation 30,99
Element 41″ Plasma TV0,99
Current large, flat-screen television0,96
Windows-mount air conditioner0,9
Legacy CRT-Based color television0,7
Legacy flat panel computer monitor0,64
While-LED lighting fixture0,61
Legacy laptop power adapter0,55
Laser Printer0,5
Incandescent lamps1
Fluorescent lamps (uncompensated)0,5
Fluorescent lamps (compensated)0,93
Discharge lamps0,4-0,6


Typical Motor Power Factors:

PowerSpeedPower Factor
(hp)(rpm)1/2 load3/4 loadfull load
0 – 518000.720.820.84
5 – 2018000.740.840.86
20 – 10018000.790.860.89
100 – 30018000.810.880.91

Reference // Power Factor in Electrical Energy Management-A. Bhatia, B.E.-2012
Power Factor Requirements for Electronic Loads in California- Brian Fortenbery,2014
Qualify Calculator from Volts to Amperes:  [kkstarratings]