Horsepower to Amps Unit Calculator
What is a Horsepower to Amps Unit Calculator?
A Horsepower to Amps Calculator is a tool that converts power in horsepower (HP) to current (Amps, A) based on voltage and efficiency. This is essential for sizing electrical components such as wires, circuit breakers, and motors.
The basic formula for conversion depends on whether the system is single-phase or three-phase:
For Single-Phase AC Circuits:
For Three-Phase AC Circuits:
For DC Circuits:
Where:
- I = Current (Amps)
- HP = Power in Horsepower
- V = Voltage (Volts)
- η = Efficiency (expressed as a decimal, e.g., 90% = 0.90)
- 746 = Watts per horsepower
- √3 (≈1.732) is used for three-phase power calculations
Why Use a Horsepower to Amps Calculator?
✅ Electrical Load Sizing – Ensuring circuits can handle motor loads
✅ Motor and Generator Selection – Matching power requirements to electrical systems
✅ Wire and Breaker Sizing – Preventing overheating and electrical faults
✅ Industrial & HVAC Applications – Calculating current for pumps, fans, and compressors
How to Use the Calculator?
- Input known values – horsepower, voltage, and efficiency
- Select circuit type – single-phase, three-phase, or DC
- Apply the correct formula to calculate amps
Example 1: Single-Phase Motor (230V, 2HP, 90% Efficiency)
Example 2: Three-Phase Motor (460V, 5HP, 95% Efficiency)
When is a Horsepower to Amps Calculator Needed?
🔹 Sizing electrical components for motors
🔹 Designing industrial electrical systems
🔹 Determining breaker and wire requirements
🔹 Power system troubleshooting and optimization