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.

Open calculator

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

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

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

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 comparisonA 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 currentTwo 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.

Assumptions. Balanced load and line-to-line voltage assumptions behind this chart.

The worksheet separates electrical input power from mechanical shaft output.
Efficiency and power factor should come from nameplate, measured data, or project assumptions documented in the calculator.
Conductor, protection, and disconnect decisions should return to motor-current and motor-protection workflows rather than using HP conversion alone.

Code and standard notes. Planning limits that should be checked before final equipment selection.

Use this chart for planning and comparison; verify motor nameplate data, equipment ratings, manufacturer instructions, and AHJ requirements before sizing conductors or protection.

How to use this chart

1Identify the power basisMark whether the calculator result is mechanical output, electrical input, apparent power, reactive power, or a simple HP-to-kW conversion.

2Keep phase and PF visibleRecord voltage, current, phase count, efficiency, and power factor before comparing the result with another motor or load condition.

3Route the next calculationUse shaft output for torque or load work, input kW for energy work, and current or kVA fields for feeder and transformer planning.

Worksheet checklist. Record source basis, review gaps, and assumptions before using the chart result.

Record input dataWrite voltage, current, phase, PF, efficiency, and selected calculator mode before reviewing output values.
Record power outputsDocument HP, mechanical kW, input kW, kVA, kVAR, losses, and current values that appear in the result area.
Record comparison targetState whether the result is being compared for motor selection, energy use, torque, transformer loading, or PF correction.

Common mistakes to avoid. Review these before turning chart current into an equipment decision.

Comparing mechanical HP with electrical input kW without accounting for motor efficiency and power factor.
Using a power conversion result for conductor or protection decisions without returning to the motor current workflow.
Treating kVA as energy use, even though utility energy cost usually follows real kWh and the rate structure.

Frequently asked questions

These answers explain how to use the chart without turning a quick reference into a final design decision.

Is HP always just kW divided by 0.746?

That conversion applies to mechanical shaft output. Electrical input kW also depends on efficiency, power factor, voltage, current, and phase.

Why keep kVA and kVAR beside kW?

The same motor can draw apparent and reactive power that affects transformers, feeders, and power-factor work even when shaft power is unchanged.