Electrical reference chart
Motor Power HP kW Chart
Use this worksheet after the calculator result to keep HP, mechanical output kW, electrical input kW, kVA, kVAR, power factor, efficiency, voltage, phase, and current in one motor-power record.
Quick reference table
A motor power HP kW chart is a calculator result record for separating mechanical output from electrical input. One horsepower is about 0.746 kW at the shaft, but feeder current and apparent power also depend on voltage, phase, efficiency, and power factor.
Motor power result checkpoints
| Checkpoint | Record from calculator | Why it matters |
|---|---|---|
| Mechanical output | HP, shaft kW, or watts | Compares motor size with the driven load |
| Electrical input | Voltage, current, phase, and PF | Separates kW from kVA and branch current |
| Efficiency | Efficiency, input-output spread, or losses | Explains heat and input power above shaft output |
| Reactive component | kVAR or PF category | Supports transformer and power-factor conversations |
| Current context | Single-phase or three-phase current basis | Routes conductor and protection work to the current calculator |
Power value interpretation
| Value shown | Use it for | Do not use it for |
|---|---|---|
| Mechanical HP | Driven-load and torque comparison | Direct feeder sizing without current calculation |
| Mechanical kW | Shaft-output conversion and efficiency work | Billing comparison unless input kW is known |
| Input kW | Energy and operating-cost estimate | Apparent-power equipment loading by itself |
| kVA | Transformer and upstream capacity screen | Real energy use without power factor |
| kVAR | Power-factor correction context | Motor output or load horsepower |
How to use this chart
Identify the power basis
Mark whether the calculator result is mechanical output, electrical input, apparent power, reactive power, or a simple HP-to-kW conversion.
Keep phase and PF visible
Record voltage, current, phase count, efficiency, and power factor before comparing the result with another motor or load condition.
Route the next calculation
Use shaft output for torque or load work, input kW for energy work, and current or kVA fields for feeder and transformer planning.
Formula basis
Mechanical kW = HP x 0.746. Three-phase input kW = 1.732 x V x A x PF / 1000.
- HP is mechanical horsepower at the shaft or selected load basis.
- Mechanical output kW is the converted shaft power before losses.
- Electrical input kW is the real power drawn from the supply after efficiency and power factor are considered.
- V, A, phase, PF, and efficiency explain why the same HP motor can have different electrical input values.
Worked examples
15 HP fan motor comparison
A 15 HP result gives about 11.19 kW of mechanical output; the worksheet keeps that value separate from input kW so efficiency and power factor are visible before comparing feeder impact.
Same HP, different input current
Two motors can share the same HP but show different current because voltage, phase, efficiency, and PF differ, so the chart keeps those fields beside the calculator result.
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Frequently asked questions
These answers explain how to use the chart without turning a quick reference into a final design decision.