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Horsepower to Kilovolt-Amps Calculator

Convert mechanical horsepower into apparent power in kilovolt-amps using the entered motor efficiency and power factor, with supporting kilowatts and watts for planning cross-checks.

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Conversions

Horsepower to kilovolt-amps calculator: estimate apparent power from motor output

A horsepower to kilovolt-amps calculator estimates the apparent power associated with a motor load when you know the mechanical horsepower, expected efficiency, and operating power factor. It is useful for first-pass generator, transformer, UPS, and feeder planning when the mechanical load is known in horsepower but the supply side is discussed in kVA.

What this horsepower to kilovolt-amps calculator solves

This page starts with mechanical horsepower and converts it into the electrical apparent power that would be required under the entered efficiency and power-factor assumptions. It also shows the supporting kilowatt and watt figures so the real-power side of the estimate stays visible.

That makes the calculator helpful when a load sheet starts from motor output but the supply equipment around it is rated in kilovolt-amps rather than horsepower.

The planning formulas behind the result

Mechanical horsepower first converts into real kilowatts using the standard 0.746 kW per horsepower relationship. Because efficiency losses sit between shaft output and electrical input, the calculator divides by the entered efficiency, then divides by power factor to estimate the apparent power in kilovolt-amps.

The result panel shows the exact working equation with the efficiency converted from percent into a decimal, which keeps the planning assumptions transparent and easy to audit.

kW = (HP x 0.746) / efficiency

Converts mechanical horsepower into the electrical real-power input implied by the entered efficiency.

kVA = kW / PF

Converts that real-power estimate into apparent power using the entered power factor.

kVA = (HP x 0.746) / (efficiency x PF)

Combined planning relationship used by the calculator after efficiency percent is converted to a decimal.

How to interpret the kVA estimate

The kVA result is an estimate of the apparent power the supply would need to support for the entered motor output and assumptions. Lower efficiency or lower power factor pushes the required kVA higher because more electrical input is needed to deliver the same mechanical output.

Treat the result as a planning value, not as a guaranteed nameplate. The supporting kilowatts and watts help you see how much of the assumption sits in efficiency versus power factor.

What this approximation does not replace

This calculator does not model startup current, service factor, harmonics, varying load, voltage imbalance, or manufacturer-specific rating methods. It also assumes a single steady operating point for both efficiency and power factor.

Use it as an educational and planning estimate. For procurement, protection, or compliance decisions, confirm the result against actual motor nameplates, measured operating data, and the applicable electrical standard.

Frequently asked questions

Why do I need both efficiency and power factor?

Because efficiency accounts for how much electrical real power is needed to produce the mechanical output, while power factor determines how that real power translates into apparent power in kVA.

 What happens if efficiency or power factor drops?

The estimated kVA rises. Lower efficiency means more real-power input is needed, and lower power factor means more apparent power is needed to deliver that real power.

 Can I use this as a final motor sizing result?

No. It is a first-pass planning approximation. Final equipment selection still depends on nameplate ratings, startup behavior, duty cycle, service factor, and code-based checks.

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