Automatic calculator from kW to Amps with the formulas for single-phase, two-phase, three-phase and direct current equipment.
Here you will find some examples explained , the steps to convert from kW to Amperes and the table of equivalences for kW to Amp. If you do not know the power factor , we will inform you of the most common values .
kW to Amps calculation formula:
- kW = kilowatt or kilowatts.
- V LN = Volts line to neutral.
- V LL = Volts line to line.
- I AC1Ø = Current / Amps 1 phase.
- I AC2Ø = Current / Amps 2 phase.
- I AC3Ø = Current / Amps 3 phase.
- FP = Power factor.
How to convert from kW to Amperes in just 3 steps:
Step 1:
Multiply the kW by 1000. For example, if you have a refrigerator that consumes 1.2kW, you must multiply 1,2 × 1000, obtaining 1200, (1,2 × 1000) = 1200.
Step 2:
Multiply the corresponding voltage according to the formula by the power factor and by the root of three. For example, if I have a 220V fridge with a power factor of 0.8, I multiply 220 × 0.8x√3 and get 304.84 ((220 × 0.8x√3) = 304.84.).
Step 3:
Divide step 1 between step 2. (1.2 × 1000) / (220 × 0.8x√3) and get 3.94A.
Examples of conversions kW to Amperes:
Example 1:
We have a monophasic sound equipment – alternating current (AC) of 1.8kW, with a neutral line voltage of 120V and line line of 240V, a power factor of 0.9, how much ampere will the sound equipment have ?.
Rta: // We must multiply the kW by 1000 (1.8kWx1000), to then divide the result between the voltage by the power factor as indicated by the formula for single-phase systems: 1.8kWx1000 / 120 × 0.9 = 16, 67A.
Example 2:
A three-phase elevator (AC) consumes 9kW, has a line voltage of 220V and a power factor of 0.8, which amperage will have in the elevator ?.
Rta: // The first thing to do is multiply the power in kW by 1000 (9kWx1000), which will result in 9000, then you must divide this result between the multiplication of the voltage by the power factor and root of three, of the following way: 220Vx0,8x√3 = 304,8, finally divide 9,000 / 304 = 29,52A.
Example 3:
It has a bulb with a power of 0.5kW biphasic (AC), a line-to-line voltage of 208V and a neutral line voltage of 120V, with a power factor of 0.98, what amperage does the bulb have ?.
Rta: // You must take the kW and multiply them by a thousand, in the following way: 0.5kWx1000 and then divide the above between the multiplication of the voltage, the power factor and two, as indicated by the formula, leaving the next way: (0.5kWx1000) / (2x120x0.98), which will result in: 2.13A.
Table kW a amperes, conversion, equivalence, transformation (Fp = 0.8, volts = 220V, AC, 3F):
| How many kW: | Ampere Equivalence |
| 1 kW | Equivalence 3,28 Amperes |
| 2 kW | 6,56 Amperes |
| 3 kW | 9,84 Amperes |
| 4 kW | 13,12 Amperes |
| 5 kW | 16,40 Amperes |
| 6 kW | 19,68 Amperes |
| 7 kW | 22,96 Amperes |
| 8 kW | 26,24 Amperes |
| 9 kW | 29,52 Amperes |
| 10 kW | 32,80 Amperes |
| 20 kW | 65,61 Amperes |
| 30 kW | 98,41 Amperes |
| 40 kW | 131,22 Amperes |
| 50 kW | 164,02 Amperes |
| 60 kW | 196,82 Amperes |
| 70 kW | 229,63 Amperes |
| 80 kW | 262,43 Amperes |
| 90 kW | 295,24 Amperes |
| 100 kW | 328,04 Amperes |
| 200 kW | 656,08 Amperes |
| 300 kW | 984,12 Amperes |
| 400 kW | 1312,16 Amperes |
| 500 kW | 1640,20 Amperes |
| 600 kW | 1968,24 Amperes |
| 700 kW | 2296,28 Amperes |
| 800 kW | 2624,32 Amperes |
| 900 kW | 2952,36 Amperes |
| 1000 kW | 3280,40 Amperes |
| 1100 kW | 3608,44 Amperes |
| 1200 kW | 3936,48 Amperes |
Note: The conversions of the previous table were made taking into account a power factor of 0.8, a voltage of 220V, with a three-phase AC power. For different variables you should use the calculator that appears at the beginning.
Typical Un-improved Power Factor by Industry:
Typical power factor of common household electronics:
Typical Motor Power Factors:
| Power | Speed | Power Factor | ||
| (hp) | (rpm) | 1/2 load | 3/4 load | full load |
| 0 – 5 | 1800 | 0.72 | 0.82 | 0.84 |
| 5 – 20 | 1800 | 0.74 | 0.84 | 0.86 |
| 20 – 100 | 1800 | 0.79 | 0.86 | 0.89 |
| 100 – 300 | 1800 | 0.81 | 0.88 | 0.91 |
Reference // Power Factor in Electrical Energy Management-A. Bhatia, B.E.-2012
Power Factor Requirements for Electronic Loads in California- Brian Fortenbery,2014
http://www.engineeringtoolbox.com
How to use the calculator from kW to Amperes:
The first thing you must do is enter the kW 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 you choose AC current, continue entering the power factor, but if you know you can see the most common below .
Finally enter the voltage, it is very important that you observe the voltage that is requested on the left side of the table, because the correct type of voltage entered (line-line voltage or line-neutral voltage) depends on a good result, finally click on calculate to finish or restart to enter new values.