Convert Power from Horsepower (British) to Kilowatts (hp to kW)

Horsepower (British) to Kilowatt Conversion Formula

Example

Let's convert 5 Horsepower (British) (hp) to Kilowatt (kW).

Using the formula:

Therefore, 5 Horsepower (British) (hp) is equal to 3.728499359312973638 Kilowatt (kW).

How many horsepower (british) are in one kilowatt? One Kilowatt (kW) contains 1.3410220890909090909 Horsepower (British) (hp) — the inverse of the factor above. Multiplying by 0.74569987186259472759 takes you from horsepower (british) to kilowatts; multiplying by 1.3410220890909090909 brings you back.

Put in words: one horsepower (british) equals 0.74569987186259472759 kilowatts, so the horsepower (british) is the smaller unit of this pair. Converting between them never changes the amount of power being measured — only the size of the unit you count it in.

What Is British Horsepower (hp)?

British horsepower (hp) is a unit used to measure power, most commonly in the imperial system of measurement.

It was initially created to describe the amount of work a horse could do over a period of time.

In simple terms, one horsepower is defined as the power needed to lift 550 pounds by a distance of one foot in just one second.

Where Did the Term 'Horsepower' Come From?

The concept of horsepower was invented by Scottish engineer James Watt in the late 18th century.

To help sell his new steam engines, he needed a simple way to compare their power to something people already understood: the strength of a draft horse.

After observing horses at work, Watt calculated that an average horse could lift 550 pounds at a rate of one foot per second.

He established this value as the standard for one horsepower (hp), creating a brilliant marketing tool that is still used today.

What Can One Horsepower Actually Do?

It can be hard to picture what "550 foot-pounds per second" feels like. Here's a more modern way to think about it:

Imagine lifting a 55-pound bag of dog food 10 feet into the air in just one second.

The power you would need to do that is roughly equal to one horsepower.

This simple standard created a practical way to measure and compare the power of different engines and motors.

How to Convert Horsepower (hp) to Watts (W)

In modern science and most parts of the world, the standard unit for power is the watt (W), named after James Watt.

The conversion between horsepower and watts is essential for comparing specifications on modern electronics and machinery.

The conversion is:

• 1 Horsepower (hp) = 745.7 Watts (W)

This means an engine rated at 10 hp has a power output of approximately 7,457 watts, or about 7.5 kilowatts (kW).

What is a Kilowatt (kW)?

A kilowatt (kW) is a standard unit used to measure power.

It's part of the metric system and is equal to exactly one thousand watts (1,000 W).

The prefix "kilo-" simply means one thousand, which makes converting between watts and kilowatts easy:

1 kilowatt (kW) = 1,000 watts (W)

You'll commonly see this unit on labels for engines, electric motors, and many household appliances to indicate their power consumption or output.

What's the Difference Between a Kilowatt (kW) and a Kilowatt-Hour (kWh)?

It's easy to mix these two up, but the distinction is crucial: they measure power versus energy.

• A kilowatt (kW) is a unit of power. It tells you how much energy is being used at a single moment. Think of it as how fast water is flowing from a hose.
• A kilowatt-hour (kWh) is a unit of energy. It measures the total amount of power consumed over a period of one hour. This is the total amount of water that has come out of the hose after an hour.

When you get your electricity bill, you are being charged for the total energy you used (the kilowatt-hours).

You are not charged for the peak power you demanded (the kilowatts).

What Are Some Common Examples of Kilowatt Power Ratings?

You can find kilowatt (kW) power ratings on many high-power devices in your home.

This rating indicates how much power a device requires to operate. Here are a few typical examples:

• Electric Kettle: 1.5 kW to 3 kW
• Electric Shower: 8 kW to 10.5 kW
• Electric Vehicle (EV) Charger: 3 kW to over 22 kW

Key Takeaways

To summarize, just remember these key points:

• Kilowatt (kW): A measure of power (how fast energy is used), equal to 1,000 watts.
• Kilowatt-hour (kWh): A measure of energy (how much total energy was used over time).
• Your Bill: You pay for the kilowatt-hours (kWh) of energy you consume.

Horsepower (British) to Kilowatt Conversion Table

Here are some quick reference conversions from Horsepower (British) (hp) to Kilowatt (kW):