What is horsepower (550 ft*lbf/s)?

It is an imperial power unit defined as 550 foot‑pounds per second, representing mechanical horsepower as originally defined by James Watt.

Is the conversion between horsepower (550 ft*lbf/s) and horsepower [hp, hp (UK)] exact?

Yes, the conversion rate is 1 to 1 for these mechanical horsepower variants.

Can I use this tool to convert metric horsepower?

No, metric horsepower differs from mechanical horsepower and requires a separate conversion approach.

How to Convert from Horsepower (550 ft*lbf/s) to Horsepower [hp, hp (UK)]

Learn how to convert horsepower (550 ft*lbf/s), the mechanical horsepower unit, to the commonly used horsepower [hp, hp (UK)] with this easy-to-use converter tool.

Horsepower (550 ft*lbf/s)

Horsepower [hp, hp (UK)]

Please check your input. It must be a valid numeric value.

Horsepower (550 ft*lbf/s) to Horsepower [hp, hp (UK)] Conversion Table

Horsepower (550 ft*lbf/s)	Horsepower [hp, hp (UK)]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Horsepower (550 ft*lbf/s) to Horsepower [hp, hp (UK)] Conversion Table
Horsepower (550 ft*lbf/s)	Horsepower [hp, hp (UK)]

Explore More Power Units Converter

What Is This Tool?

This converter allows you to transform power values measured in horsepower (550 ft*lbf/s), the imperial mechanical horsepower unit, into horsepower [hp, hp (UK)], standardizing power ratings for engines, machinery, and equipment within imperial unit frameworks.

How to Use This Tool?

Enter the numerical value in horsepower (550 ft*lbf/s) you want to convert
Select horsepower [hp, hp (UK)] as the target unit
Click the convert button to receive the equivalent power rating instantly

Key Features

Converts between horsepower (550 ft*lbf/s) and horsepower [hp, hp (UK)] with a 1:1 ratio
Supports power rating standardization for automotive, motorcycle, marine, and industrial machinery
Browser-based and straightforward unit conversion tool
Suitable for comparing and specifying engine outputs and small equipment power

Examples

5 horsepower (550 ft*lbf/s) converts to 5 horsepower [hp, hp (UK)]
0.75 horsepower (550 ft*lbf/s) converts to 0.75 horsepower [hp, hp (UK)]

Common Use Cases

Rating internal combustion engines in cars and motorcycles
Specifying power for electric motors, pumps, and lawnmowers in product datasheets
Comparing performance of marine engines and industrial machinery where mechanical horsepower is used

Tips & Best Practices

Ensure the horsepower variant is mechanical (550 ft*lbf/s) before converting
Use this conversion to maintain consistency across power specifications in imperial units
Refer to product documentation for the correct horsepower unit to avoid confusion with metric variants

Limitations

Conversion solely applies to the mechanical/imperial horsepower defined as 550 ft*lbf/s
Other horsepower types, like metric horsepower, need different conversion methods
The tool does not account for variations in horsepower definitions beyond the specified units

Frequently Asked Questions

What is horsepower (550 ft*lbf/s)?: It is an imperial power unit defined as 550 foot‑pounds per second, representing mechanical horsepower as originally defined by James Watt.
Is the conversion between horsepower (550 ft*lbf/s) and horsepower [hp, hp (UK)] exact?: Yes, the conversion rate is 1 to 1 for these mechanical horsepower variants.
Can I use this tool to convert metric horsepower?: No, metric horsepower differs from mechanical horsepower and requires a separate conversion approach.

Key Terminology

Horsepower (550 ft*lbf/s): An imperial power unit equal to 550 foot-pounds per second, used especially for rating engines and machinery.
Horsepower [hp, hp (UK)]: A mechanical/imperial horsepower unit approximately equal to 745.7 watts, equivalent to horsepower (550 ft*lbf/s).
Mechanical horsepower: The original definition of horsepower based on foot-pounds per second of work done, standardized as 550 ft*lbf/s.

Quick Knowledge Check

Which unit is defined as 550 foot-pounds per second?

Metric horsepower

Horsepower (550 ft*lbf/s)

Watt

What is the conversion ratio from horsepower (550 ft*lbf/s) to horsepower [hp, hp (UK)]?

1:1

1:0.9

Variable depending on engine type

For what types of equipment is horsepower (550 ft*lbf/s) commonly used?

Internal combustion engines and small machinery

Solar panels

Electrical circuits

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