When selecting motors and designing electrical systems, one of the most critical calculations engineers and technicians need is determining the motor amperage based on horsepower ratings. Whether you’re working with single-phase, three-phase, or DC motors, having accurate motor FLA charts (Full Load Amperage) at your fingertips can save time and prevent costly mistakes in motor sizing and electrical system design.
Quick Rules of Thumb for Motor Amperage Calculations
Before diving into our comprehensive electric motor amperage charts, here are some useful “rules of thumb” for estimating amps from horsepower ratings:
- 115 volts motor – single-phase: 14 amps/hp
- 230 volts motor – single-phase: 7 amps/hp
- 230 volts motor – 3-phase: 2.5 amps/hp
- 460 volts motor – 3-phase: 1.25 amps/hp
Important Note: These are approximations only. Always check nameplate information before designing protective devices, wiring, and switchgear.
Single-Phase Motors
HP and Full-Load Currents
| Power | HP | kW | Full Load Current (Amps) | |||||
|---|---|---|---|---|---|---|---|---|
| Horsepower | Kilowatts | 115V | 208V | 230V | 240V | 277V | 480V | |
| 1/8 | 0.125 | 0.093 | 4.4 | 2.4 | 2.2 | 2.1 | 1.8 | 1.0 |
| 1/6 | 0.167 | 0.125 | 5.8 | 3.2 | 2.9 | 2.8 | 2.4 | 1.4 |
| 1/4 | 0.25 | 0.186 | 7.2 | 4.0 | 3.6 | 3.5 | 3.0 | 1.7 |
| 1/3 | 0.33 | 0.248 | 9.2 | 5.1 | 4.6 | 4.4 | 3.8 | 2.2 |
| 1/2 | 0.5 | 0.373 | 13.8 | 7.6 | 6.9 | 6.6 | 5.7 | 3.3 |
| 3/4 | 0.75 | 0.559 | 20.0 | 11.0 | 10.0 | 9.6 | 8.3 | 4.8 |
| 1 | 1.0 | 0.746 | 24.0 | 13.2 | 12.0 | 11.5 | 10.0 | 5.8 |
| 1.5 | 1.5 | 1.119 | 34.0 | 18.7 | 17.0 | 16.3 | 14.1 | 8.2 |
| 2 | 2.0 | 1.492 | 44.0 | 24.2 | 22.0 | 21.1 | 18.3 | 10.6 |
| 3 | 3.0 | 2.238 | 64.0 | 35.2 | 32.0 | 30.7 | 26.6 | 15.4 |
| 5 | 5.0 | 3.730 | 100.0 | 55.0 | 50.0 | 48.0 | 41.6 | 24.1 |
Three-Phase Motors
HP and Full-Load Currents
| Power | HP | kW | Full Load Current (Amps) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Horsepower | Kilowatts | 115V | 208V | 230V | 460V | 480V | 575V | 2300V | |
| 1/4 | 0.25 | 0.186 | 2.0 | 1.1 | 1.0 | 0.5 | 0.5 | 0.4 | – |
| 1/3 | 0.33 | 0.248 | 2.5 | 1.4 | 1.3 | 0.6 | 0.6 | 0.5 | – |
| 1/2 | 0.5 | 0.373 | 3.6 | 2.0 | 1.8 | 0.9 | 0.9 | 0.7 | – |
| 3/4 | 0.75 | 0.559 | 5.0 | 2.8 | 2.5 | 1.3 | 1.2 | 1.0 | – |
| 1 | 1.0 | 0.746 | 6.5 | 3.6 | 3.2 | 1.6 | 1.5 | 1.2 | – |
| 1.5 | 1.5 | 1.119 | 9.4 | 5.2 | 4.6 | 2.3 | 2.2 | 1.8 | – |
| 2 | 2.0 | 1.492 | 12.2 | 6.8 | 6.0 | 3.0 | 2.9 | 2.3 | – |
| 3 | 3.0 | 2.238 | 17.3 | 9.6 | 8.5 | 4.2 | 4.0 | 3.3 | – |
| 5 | 5.0 | 3.730 | 27.4 | 15.2 | 13.6 | 6.8 | 6.5 | 5.2 | 1.3 |
| 7.5 | 7.5 | 5.595 | 39.6 | 22.0 | 19.6 | 9.8 | 9.4 | 7.6 | 1.9 |
| 10 | 10.0 | 7.460 | 50.4 | 28.0 | 25.0 | 12.5 | 12.0 | 9.6 | 2.4 |
| 15 | 15.0 | 11.190 | 72.0 | 40.0 | 36.0 | 18.0 | 17.2 | 13.8 | 3.5 |
| 20 | 20.0 | 14.920 | 93.6 | 52.0 | 46.0 | 23.0 | 22.0 | 17.6 | 4.4 |
| 25 | 25.0 | 18.650 | 115.2 | 64.0 | 57.0 | 28.5 | 27.3 | 21.8 | 5.5 |
| 30 | 30.0 | 22.380 | 136.8 | 76.0 | 68.0 | 34.0 | 32.6 | 26.1 | 6.5 |
| 40 | 40.0 | 29.840 | 180.0 | 100.0 | 89.0 | 44.5 | 42.6 | 34.1 | 8.5 |
| 50 | 50.0 | 37.300 | 223.2 | 124.0 | 110.0 | 55.0 | 52.6 | 42.1 | 10.5 |
| 60 | 60.0 | 44.760 | 266.4 | 148.0 | 132.0 | 66.0 | 63.2 | 50.6 | 12.6 |
| 75 | 75.0 | 55.950 | 324.0 | 180.0 | 161.0 | 80.5 | 77.0 | 61.6 | 15.4 |
| 100 | 100.0 | 74.600 | 432.0 | 240.0 | 214.0 | 107.0 | 102.4 | 81.9 | 20.5 |
Direct Current Motors
Power and Full-Load Currents
| Power | HP | kW | Full Load Current (Amps) | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Horsepower | Kilowatts | 90V | 120V | 180V | 230V | 240V | 440V | 500V | 550V | |
| 1/4 | 0.25 | 0.186 | 2.9 | 2.2 | 1.4 | 1.1 | 1.1 | 0.6 | 0.5 | 0.5 |
| 1/3 | 0.33 | 0.248 | 3.8 | 2.9 | 1.9 | 1.5 | 1.4 | 0.8 | 0.7 | 0.6 |
| 1/2 | 0.5 | 0.373 | 5.8 | 4.4 | 2.9 | 2.3 | 2.2 | 1.2 | 1.0 | 0.9 |
| 3/4 | 0.75 | 0.559 | 8.5 | 6.4 | 4.3 | 3.3 | 3.2 | 1.8 | 1.5 | 1.4 |
| 1 | 1.0 | 0.746 | 11.5 | 8.6 | 5.7 | 4.5 | 4.3 | 2.3 | 2.1 | 1.9 |
| 1.5 | 1.5 | 1.119 | 17.0 | 12.8 | 8.5 | 6.7 | 6.4 | 3.5 | 3.1 | 2.8 |
| 2 | 2.0 | 1.492 | 22.8 | 17.1 | 11.4 | 8.9 | 8.5 | 4.7 | 4.1 | 3.7 |
| 3 | 3.0 | 2.238 | 34.2 | 25.6 | 17.1 | 13.4 | 12.8 | 7.0 | 6.1 | 5.6 |
| 5 | 5.0 | 3.730 | 57.0 | 42.8 | 28.5 | 22.3 | 21.4 | 11.7 | 10.3 | 9.3 |
| 7.5 | 7.5 | 5.595 | 85.5 | 64.1 | 42.7 | 33.4 | 32.0 | 17.5 | 15.4 | 14.0 |
| 10 | 10.0 | 7.460 | 114.0 | 85.5 | 57.0 | 44.6 | 42.8 | 23.4 | 20.5 | 18.7 |
| 15 | 15.0 | 11.190 | 171.0 | 128.3 | 85.5 | 66.9 | 64.1 | 35.0 | 30.8 | 28.0 |
| 20 | 20.0 | 14.920 | 228.0 | 171.0 | 114.0 | 89.2 | 85.5 | 46.7 | 41.1 | 37.3 |
| 25 | 25.0 | 18.650 | 285.0 | 213.8 | 142.5 | 111.5 | 106.9 | 58.4 | 51.3 | 46.7 |
| 30 | 30.0 | 22.380 | 342.0 | 256.5 | 171.0 | 133.8 | 128.3 | 70.1 | 61.6 | 56.0 |
| 40 | 40.0 | 29.840 | 456.0 | 342.0 | 228.0 | 178.4 | 171.0 | 93.4 | 82.1 | 74.7 |
| 50 | 50.0 | 37.300 | 570.0 | 427.5 | 285.0 | 223.0 | 213.8 | 116.8 | 102.6 | 93.3 |
| 60 | 60.0 | 44.760 | 684.0 | 513.0 | 342.0 | 267.6 | 256.5 | 140.1 | 123.1 | 112.0 |
| 75 | 75.0 | 55.950 | 855.0 | 641.3 | 427.5 | 334.5 | 320.6 | 175.2 | 153.9 | 140.0 |
| 100 | 100.0 | 74.600 | 1140.0 | 855.0 | 570.0 | 446.0 | 427.5 | 233.6 | 205.2 | 186.7 |
MISUMI USA carries several options of general purpose motors, including three phase fractional motors, and single phase fractional motors. Please feel free to reach out to our product specialists with any questions you might have in regards to electric motors and your project requirements/measurements – you can also check out our Electrical Motor Calculator for more help.
Author: Scott Bredemann | Updated: 5/28/2025
Disclaimer
The content on this webpage is for informational purposes only. MISUMI makes no guarantees, expressed or implied, regarding the accuracy, completeness, or validity of the information. Performance parameters, tolerances, designs, materials, or processes should not be assumed to reflect third-party suppliers’ or manufacturers’ deliverables within MISUMI’s network. Buyers are responsible for specifying their part requirements