HP to Amps Calculator

Convert horsepower (HP) to amps for electric motors. Calculate current draw for DC, single-phase, and three-phase motors.

HP
V

CURRENT

20.32 A

WATTS

3,730 W

FORMULA

I=(HPร—746)/(Vร—Effร—PF)

HP to Amps โ€” Reference (240V, PF=0.85, Eff=90%)

HPkWAmps (1ฮฆ)Amps (3ฮฆ)
0.5 HP0.372.03 A1.17 A
1 HP0.754.06 A2.35 A
1.5 HP1.126.09 A3.52 A
2 HP1.498.13 A4.69 A
3 HP2.2412.19 A7.04 A
5 HP3.7320.32 A11.73 A
7.5 HP5.630.47 A17.59 A
10 HP7.4640.63 A23.46 A
15 HP11.1960.95 A35.19 A
20 HP14.9281.26 A46.92 A
25 HP18.65101.58 A58.65 A
30 HP22.38121.9 A70.38 A
50 HP37.3203.16 A117.29 A

๐Ÿ’ก How to Convert HP to Amps

The HP to amps conversion is essential for selecting the right wire size, breaker, and starter for electric motors.

Formula

I = (HP ร— 746) / (V ร— Eff ร— PF)

Example: 5 HP motor at 240V, PF=0.85, Eff=90%:
I = (5 ร— 746) / (240 ร— 0.9 ร— 0.85) = 20.3 amps

NEC Motor Full Load Amps (FLA) Reference

The NEC provides full-load amp tables (Tables 430.247-430.250) for standard motor ratings. These are used for wire and breaker sizing, not the nameplate amps.

5 HP at 240V (PF=0.85, Eff=90%) = 20.3 amps. Always use NEC FLA tables for wire/breaker sizing.

HP to Amps Calculator FAQ

๐Ÿ”— Related Calculators

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