Watts to Amps Calculator
Quickly convert watts to amps using this free online calculator. Works for DC, single-phase, and three-phase AC systems. Instant, accurate electrical conversion...
Quick Intro: Convert Watts to Amps
To convert watts to amps, simply divide the power in watts by the voltage in volts. For AC systems, you'll also multiply by a power factor and √3 if it's three-phase. This calculator automatically applies the correct formula based on the input type (DC, single-phase, or three-phase AC), making it a fast and reliable way to find current values. Use the form below to enter your watt and voltage values, and get instant amp results with our built-in formula and data table conversion.
Formula & Table Summary:
- P(kW) = HP × 0.746
- 1φ: I = (HP × 0.746 × 1000) / (V × PF × η)
- 3φ: I = (HP × 0.746 × 1000) / (√3 × V × PF × η)
3 phase hp to amps calculator
This horse power to Amperes Calculator allows you to estimate the current that a motor will draw based on its horsepower rating, its various voltages and its efficiency and its power factor. It can operate AC motors in three-phase and single phase. This can be handy when trying to size circuit breaker, cable, and transformer loads. It has many applications in industrial motors installations, in pump sizing, HVAC as well as electrical design work.
single phase hp to amps
| HP | Voltage (V) | Phase | PF | Eff (%) | Current (A) |
|---|---|---|---|---|---|
| 5 | 230 | 1φ | 0.9 | 90 | 19.4 |
| 10 | 415 | 3φ | 0.85 | 92 | 16.6 |
| 50 | 460 | 3φ | 0.9 | 95 | 85.0 |
Frequently Asked Questions - Watts to Amps Calculator:
What is the formula to convert watts to amps?
For DC: Amps = Watts ÷ Volts. For AC, you also consider power factor and phase.
Do I need a power factor for AC conversion?
Yes, for accurate AC calculations, the power factor (typically 0.8) must be included.
Can I convert kW to amps?
Yes, multiply kW by 1000 to get watts, then apply the formula.
How accurate is this calculator?
It provides highly accurate results, using standard electrical formulas.
Is this tool useful for both AC and DC circuits?
Yes, it works for DC, single-phase, and three-phase AC systems.
What if I don't know the power factor?
Use 0.8 as a common default for general calculations.
How many amps is 1000 watts at 120 volts?
For DC: 1000 ÷ 120 = 8.33 Amps.
Does voltage affect current?
Yes, higher voltage results in lower current for the same power.
Can I use this calculator for solar or inverter systems?
Absolutely, it’s ideal for off-grid, solar, and battery applications.
Is there a mobile version of this calculator?
Yes, it’s responsive and works on all smartphones and devices.
