By Carter McBride | Updated Mar 24, 2022

Electrical current, measured in amperes (amps), indicates the flow of electrons through a circuit. Horsepower, on the other hand, quantifies the mechanical power a motor delivers. When you know both horsepower and the supply voltage, you can reliably compute the current draw using a straightforward application of Ohm’s Law (P = V × I).

Step 1: Convert Horsepower to Watts

Multiply the horsepower figure by 746 W, the industry‑standard conversion factor. For example, a 2‑hp motor running on 230 V becomes 2 × 746 = 1,492 W.

Step 2: Derive Current from Power and Voltage

Divide the wattage from Step 1 by the operating voltage to obtain amps. In the example, 1,492 W ÷ 230 V ≈ 6.49 A.

Step 3: Verify the Result

Double‑check your arithmetic. A quick sanity check—such as ensuring the current value is reasonable for the motor’s rated load—helps prevent costly mistakes.