KW to Amps Calculator – Convert Kilowatts to Amps

Welcome to our KW to Amps Calculator! This powerful online tool allows you to effortlessly convert Kilowatts (kW) to Amperes (A) for electrical calculations. Whether you’re an electrical engineer, student, or anyone dealing with power systems, our calculator provides precise and reliable results. Developed and validated by experts in the field, you can trust its accuracy and performance. Say goodbye to manual conversions and streamline your calculations with our user-friendly KW to Amps Calculator. Start using it now and simplify your electrical power computations!

KW to Amps Calculator


What is a KW to Amps Calculator?

A kW to Amps Calculator is a tool used to convert electrical power from kilowatts (kW) to amperes (amps or A). This calculator is particularly useful in electrical engineering and related fields to determine the electrical current flowing through a circuit or device when its power consumption is given in kilowatts.

In electrical systems, power is the rate at which energy is consumed or produced, and it is typically measured in watts (W) or kilowatts (kW). Current, on the other hand, measures the flow of electric charge and is expressed in amperes (amps). The relationship between power (kW), current (A), and voltage (V) is given by the following formulas:

For Direct Current (DC) circuits: Current (A) = 1000 * Power (kW) / Voltage (V)

For Alternating Current (AC) circuits:

  • For Single Phase AC: Current (A) = 1000 * Power (kW) / (Power Factor * Voltage (V))
  • For Three Phase AC (Line to Line Voltage): Current (A) = 1000 * Power (kW) / (√3 * Power Factor * Line to Line Voltage (V))
  • For Three Phase AC (Line to Neutral Voltage): Current (A) = 1000 * Power (kW) / (3 * Power Factor * Line to Neutral Voltage (V))

A kW to Amps Calculator automates these calculations, allowing users to input the power in kilowatts and the voltage (and optionally, the power factor for AC circuits), and it quickly outputs the corresponding current in amperes. This is helpful for electrical engineers, electricians, and anyone dealing with electrical systems to ensure that circuits and devices can handle the expected current safely and efficiently.

How does this KW to Amps Calculator work?

Let me explain how this KW to Amps Calculator works in a simple and easy-to-understand manner:


  1. First, when you open the calculator page, you’ll see a form with three options: “DC,” “AC – Single phase,” and “AC – Three phase.” You can choose the appropriate option based on the type of electrical current you are dealing with.
  2. Once you select the current type, the form will adjust accordingly. If you choose “AC – Single phase” or “AC – Three phase,” an additional input field labelled “Power factor (≤1)” will appear. The power factor is a value that influences the calculation for AC circuits.
  3. Next, you need to enter the power in kilowatts (kW) of the electrical device or circuit for which you want to calculate the current. Simply type the power value in the provided box.
  4. After that, you’ll need to enter the voltage in volts (V) of the electrical system. Again, type the voltage value in the corresponding box.
  5. If you are dealing with an AC circuit and the “Power factor (≤1)” field is visible, you have the option to input the power factor value. A power factor is a number between 0 and 1 that represents the efficiency of the electrical system. If unsure, you can leave it at the default value of 1.


  1. Once you have entered the required values, click the “Calculate” button. The calculator will perform the necessary calculations based on the current type, power, voltage, and power factor (if applicable).
  2. The result will be displayed in two boxes: “Current (amps)” and “Current (milliamps).” The “Current (amps)” box shows the value of current in amperes (A), and the “Current (milliamps)” box shows the value of current in milliamperes (mA).
  3. If you want to perform another calculation, click the “Reset” button to clear the input fields, and then you can start again.
  4. Additionally, if you need to convert from amps to kilowatts, you can click the “Swap conversion” button to access the Amps to kW Calculator.
  5. Finally, the calculator also includes a label indicating the units for each input and output value to make it easier to understand the results.


In summary, this KW to Amps Calculator helps you convert electrical power from kilowatts to amperes, taking into account the current type and voltage of the electrical system. It is a handy tool for anyone working with electrical circuits, as it provides quick and accurate current calculations.

Algorithm, Accuracy and Performance of this Amps to Kw Calculator

The KW to amps calculator was developed based on a comprehensive review of various sources, including guidance from professors, scientific papers, and open-source websites. Kenan Baltaci and Bethanie Stadler played significant roles in creating and validating the algorithm, ensuring the performance and accuracy of this KW to amps converter. As a result, we can confidently state that the calculator has been thoroughly validated by a Professor of Electrical Engineering.

We also have an Apms to KW calculator that works opposite of this calculator.

KW to Amps Conversion – Details

Here are the details of the formulas used in this calculator.

DC Kilowatts to Amps Calculation:

The formula for calculating the current (I) in amps for a DC circuit is straightforward. To find the current, you take the power (P) of the circuit in kilowatts (kW) and divide it by the voltage (V) in volts (V). Then, you multiply the result by 1000.Formula: I (A) = (1000 * P (kW)) / V (V)

AC Single Phase Kilowatts to Amps Calculation:

For single-phase AC circuits, we need to consider the power factor (PF) in addition to the power and voltage. To calculate the current (I) in amps for single-phase AC, divide the power (P) in kilowatts (kW) by the product of the power factor (PF) and the RMS voltage (V) in volts (V). Then, multiply the result by 1000.Formula: I (A) = (1000 * P (kW)) / (PF * V (V))

AC Three Phase Kilowatts to Amps Calculation:

For three-phase AC circuits, there are two variations of the formula, depending on whether you have the line-to-line voltage (VL-L) or line-to-neutral voltage (VL-N).

  1. Calculation with Line-to-Line Voltage: To find the current (I) in amps for three-phase AC circuits with line-to-line voltage, divide the power (P) in kilowatts (kW) by the product of the square root of 3, the power factor (PF), and the line-to-line RMS voltage (VL-L) in volts (V). Then, multiply the result by 1000.Formula: I (A) = (1000 * P (kW)) / (√3 * PF * VL-L (V))
  2. Calculation with Line-to-Neutral Voltage: To find the current (I) in amps for three-phase AC circuits with line-to-neutral voltage, divide the power (P) in kilowatts (kW) by the product of 3, the power factor (PF), and the line-to-neutral RMS voltage (VL-N) in volts (V). Then, multiply the result by 1000.Formula: I (A) = (1000 * P (kW)) / (3 * PF * VL-N (V))

Table for Typical power factor values

DeviceTypical Power Factor
Resistive Load1
Fluorescent Lamp0.95
Incandescent Lamp1
Induction Motor (Full Load)0.85
Induction Motor (No Load)0.35
Resistive Oven1
Synchronous Motor0.9

The table on Motor Current Ratings (Single-Phase AC)

Motor Current Ratings (A)Current at 120VCurrent at 208VCurrent at 240VCurrent at 277VCurrent at 480VMotor Current Ratings (kW)
0.25 HP5.
0.33 HP7.
0.5 HP9.
0.75 HP13.
1.0 HP16.
1.5 HP24.414.
2.0 HP31.618.315.813.57.81.488
3.0 HP46.426.823.119.811.52.232
5.0 HP77.344.738.633.019.13.720
7.5 HP11365.556.548.427.95.580
10 HP15087.
15 HP22613011397.056.111.160
20 HP30217415012974.714.880
25 HP37721718816193.118.600
30 HP45226122519311122.320
40 HP60334830125814929.760
50 HP75443537632218637.200
60 HP90552245138722344.640
75 HP113065256448427955.800
100 HP150087075064237174.400
125 HP1880108793880546493.000
150 HP226013041125967558111.600
200 HP3010174115001283744148.800
250 HP3760217918751603930186.000
300 HP45102617225019241116223.200
350 HP52603055262522441302260.400
400 HP60103493300025651488297.600
450 HP67603930337528851674334.800
500 HP75104368375032061860372.000
600 HP90105243450038472232446.400
700 HP105106118525044892604520.800
800 HP120106993600051302976595.200
900 HP135107868675057723348669.600
1000 HP150108743750064133720744.000
1250 HP1881010929937580164650930.000
1500 HP226101311411250961955801116.000
1750 HP2641015300131251122265101302.000
2000 HP3021017485150001282674401488.000
2500 HP3776021856187501603393001860.000
3000 HP45310262282250019240111602232.000
3500 HP52860305992625022447130202604.000
4000 HP60410349703000025654148802976.000

The table on Motor Current Ratings (Three-Phase AC)

Motor Current Ratings (A)Current at 208VCurrent at 220VCurrent at 230VCurrent at 380VCurrent at 400VCurrent at 415VCurrent at 440VCurrent at 460VCurrent at 480VMotor Current Ratings (kW)
0.25 HP0.
0.33 HP1.
0.5 HP1.
0.75 HP2.
1.0 HP3.
1.5 HP4.
2.0 HP6.
3.0 HP9.
5.0 HP15.214.615.
7.5 HP22.921.822.513.
10 HP30.529.130.017.417.417.417.417.417.47.440
15 HP45.743.645.
20 HP61.
25 HP76.272.775.043.543.543.543.543.543.518.600
30 HP91.487.390.
40 HP12111512069.669.669.669.669.669.629.760
50 HP15114415087.
60 HP18117318010410410410410410444.640
75 HP22721622513013013013013013055.800
100 HP30228830017317317317317317374.400
125 HP37836037521621621621621621693.000
150 HP454432450259259259259259259111.600
175 HP530504525303303303303303303130.200
200 HP605576600346346346346346346148.800
250 HP756720750433433433433433433186.000
300 HP908864900519519519519519519223.200
350 HP105910081050606606606606606606260.400
400 HP121111521200692692692692692692297.600
450 HP136312961350779779779779779779334.800
500 HP151414401500865865865865865865372.000
600 HP181617281800103810381038103810381038446.400
700 HP211920162100121112111211121112111211520.800
800 HP242123042400138413841384138413841384595.200
900 HP272325922700155715571557155715571557669.600
1000 HP302628803000172917291729172917291729744.000
1250 HP378336003750216121612161216121612161930.000
1500 HP4540432045002594259425942594259425941116.000
1750 HP5296504052503027302730273027302730271302.000
2000 HP6053576060003460346034603460346034601488.000
2500 HP7566720075004325432543254325432543251860.000
3000 HP9079864090005190519051905190519051902232.000

How many kW in 1 ampere?

The relationship between kilowatts (kW) and amperes (A) depends on the electrical system’s voltage. The formula to calculate the power in kilowatts (kW) from the current in amperes (A) and the voltage in volts (V) is:

Power (kW) = Current (A) × Voltage (V) / 1000

For example, if the voltage is 120 volts (V) and the current is 1 ampere (A):

Power (kW) = 1 A × 120 V / 1000 = 0.12 kW

So, 1 ampere is equal to 0.12 kilowatts at 120 volts. The power in kilowatts for 1 ampere will vary depending on the electrical system’s voltage.

How many amps are in a kilowatt hour?

A kilowatt-hour (kWh) is a unit of energy equal to one kilowatt (kW) of power used for one hour.

To calculate the number of amperes (amps) in a kilowatt-hour, you would need to know the voltage of the electrical system. The formula to convert kilowatt-hours to amperes is:

Amperes (A) = Kilowatt-hours (kWh) × 1000 / Hours × Voltage (V)

For example, if you have 1 kilowatt-hour of energy consumed in 1 hour at 120 volts (V):

Amperes (A) = 1 kWh × 1000 / 1 hour × 120 V = 8.33 amps

So, there are approximately 8.33 amperes in 1 kilowatt-hour at 120 volts. The number of amps will vary based on the voltage of the electrical system and the amount of energy consumed (kWh).