How many watts are in 1 horsepower?

1 mechanical horsepower (hp) equals approximately 745.69987 watts (0.7457 kW). 1 metric horsepower (PS/cv) equals 735.49875 watts.

How do you convert kilowatts to horsepower?

Multiply kW by 1.34102 to get mechanical horsepower (hp).

What is BTU per hour in watts?

1 BTU/hr is equal to approximately 0.293071 watts.

Why are there two different horsepower units?

Mechanical horsepower (745.7 W) is the traditional imperial unit used in the US and UK for cars and engines. Metric horsepower — also called PS or cv — (735.5 W) is used across most of Europe and Asia. They differ by about 1.4%, which rarely matters for everyday comparisons but does matter for precise engineering specs.

How many watts does a typical air conditioner use?

A small window air conditioner is often rated around 5,000-8,000 BTU/hr, which converts to roughly 1,465-2,345 watts — useful context when comparing an AC unit's cooling capacity (in BTU/hr) against its electrical draw (in watts).

Power Converter

Instant, precise power converter with live formula explanations and interactive lookup tables.

TL;DR: Power Converter performs exact deterministic conversion across power units with zero server latency.

PRESETS:

FROM

SLIDER: 100

PRECISION:

Convert to All Power Converter Units at Once

Click any card to select target

Mathematical Formula

Reference Conversion Table

From	To

Why Use This Tool?

Power Converter switches between electrical, mechanical, and HVAC power units instantly — useful for comparing appliance ratings, engine specs, and air conditioner/heater capacity listed in different units.

How to Use the Power Converter

Our Power Converter uses exact international metrology factors to deliver accurate and reliable conversions right inside your web browser. Choose your starting unit and target unit, then type a value — the conversion updates instantly.

Unit	Equal to (in watts)
1 Kilowatt (kW)	1,000 W
1 Megawatt (MW)	1,000,000 W
1 Horsepower, mechanical (hp)	745.700 W
1 Horsepower, metric (hp(M))	735.499 W
1 BTU per Hour	0.293071 W

Mathematical Formula & Methodology

Here is the standard mathematical equation used to calculate this result accurately:

P_{\text{target}} = P_{\text{source}} \times \frac{\text{Factor}_{\text{source}}}{\text{Factor}_{\text{target}}}

Formula Variables Explained:
Energy transfer rate conversions across Watts (W), Kilowatts (kW), and Mechanical Horsepower (hp).

Step-by-Step Worked Example

Converting 150 Horsepower to Kilowatts: $150 \text{ hp} \times 0.74569987 = 111.855 \text{ kW}$.

100% Client-Side Privacy Guarantee

All processing runs locally inside your browser using JavaScript and HTML5 APIs. Your data, files, and inputs are never uploaded to any remote server. Complete privacy by design.

Frequently Asked Questions

: 1 mechanical horsepower (hp) equals approximately 745.69987 watts (0.7457 kW). 1 metric horsepower (PS/cv) equals 735.49875 watts.
: Multiply kW by 1.34102 to get mechanical horsepower (hp).
: 1 BTU/hr is equal to approximately 0.293071 watts.
: Mechanical horsepower (745.7 W) is the traditional imperial unit used in the US and UK for cars and engines. Metric horsepower — also called PS or cv — (735.5 W) is used across most of Europe and Asia. They differ by about 1.4%, which rarely matters for everyday comparisons but does matter for precise engineering specs.
: A small window air conditioner is often rated around 5,000-8,000 BTU/hr, which converts to roughly 1,465-2,345 watts — useful context when comparing an AC unit's cooling capacity (in BTU/hr) against its electrical draw (in watts).

Embed This Tool

<iframe src="https://nexlove.org/embed/power-converter.html" width="100%" height="650" style="border:1px solid #e2e8f0;border-radius:12px" title="Power Converter — NexLove.org" loading="lazy"></iframe>

Related Converters

Unit Converter

Length Converter

Browse all Calculators