Enter the horsepower, voltage, efficiency, and power factor into the calculator to convert hp to amps. This calculator can also evaluate the hp volts, efficiency, or power factor given the other variables.
- All Unit Converters
- Electricity, Magnetism, & Electronics Unit Converters
- CC to HP Calculator
- WHP to HP Calculator
- HP to KVA Calculator
- HP to Voltage Calculator
- RWKW to HP Calculator
- HP to Torque Calculator
- HP to Joules Calculator
| Calculator Operations | Required Inputs |
|---|---|
| Convert Horsepower to Amps | Total Horsepower |
| Convert Amps to Horsepower | Total Amps |
HP to Amps Formula
The following formula is used to calculate the total horsepower from amps.
A = HP * 746 / (V* n * PF)
- Where A is the amps
- HP is the horsepower
- V is the volts
- n is the efficiency
- PF is the power factor
To calculate amps from HP, multiply the hp by 746, then divide the result by the product of the volts, efficiency, and power factor.
| Horsepower (HP) | 1‑phase 120 V (A) | 1‑phase 240 V (A) | 3‑phase 208 V (A) | 3‑phase 230 V (A) | 3‑phase 460 V (A) |
|---|---|---|---|---|---|
| ¼ | 2.03 | 1.02 | 0.68 | 0.61 | 0.31 |
| â…“ | 2.71 | 1.35 | 0.90 | 0.82 | 0.41 |
| ½ | 4.06 | 2.03 | 1.35 | 1.22 | 0.61 |
| ¾ | 6.09 | 3.05 | 2.03 | 1.83 | 0.92 |
| 1 | 8.12 | 4.06 | 2.70 | 2.45 | 1.22 |
| 1½ | 12.18 | 6.09 | 4.06 | 3.67 | 1.83 |
| 2 | 16.24 | 8.12 | 5.41 | 4.89 | 2.45 |
| 3 | 24.36 | 12.18 | 8.11 | 7.34 | 3.67 |
| 5 | 40.60 | 20.30 | 13.52 | 12.23 | 6.12 |
| 7½ | 60.91 | 30.45 | 20.29 | 18.35 | 9.17 |
| 10 | 81.21 | 40.60 | 27.05 | 24.46 | 12.23 |
| 15 | 121.81 | 60.91 | 40.57 | 36.69 | 18.35 |
| 20 | 162.42 | 81.21 | 54.10 | 48.92 | 24.46 |
| 25 | 203.02 | 101.51 | 67.62 | 61.16 | 30.58 |
| 30 | 243.63 | 121.81 | 81.15 | 73.39 | 36.69 |
| 40 | 324.84 | 162.42 | 108.20 | 97.85 | 48.92 |
| 50 | 406.05 | 203.02 | 135.25 | 122.31 | 61.16 |
| 60 | 487.25 | 243.63 | 162.30 | 146.77 | 73.39 |
| 75 | 609.07 | 304.53 | 202.87 | 183.47 | 91.73 |
| 100 | 812.09 | 406.05 | 270.50 | 244.62 | 122.31 |
| * Rounded to 2 decimals. Assumes motor efficiency η = 0.90 and power factor PF = 0.85. 1 HP = 746 W. Single‑phase: I = HP × 746 / (η × PF × V). Three‑phase: I = HP × 746 / (η × PF × √3 × V). | |||||
HP to Amps Definition
HP to amps is the conversion from the standard unit of mechanical power to electrical power of amps.
HP to Amps Example
How to calculate HP to Amps?
- First, determine the total horsepower.
Measure the horsepower of the engine.
- Next, determine the volts.
Measure the volts.
- Next, determine the efficiency.
Calculate the efficiency.
- Next, determine the power factor.
Calculate the power factor.
- Finally, calculate hp to amps.
Calculate hp to amps using the formula above.
FAQ
A horsepower is a standard unit for electrical power that is equal to exactly 746 watts.
If you are converting directly from watts, you simply need to divide the watts by 746 to get horsepower. If you are converting from Amps, you must include more information about the motor as described in the formula A = HP * 746 / (V* n * PF).
