SettingsSettings for this calculationUS
The power value to convert.
Useful for comparing a motor or pump's spec sheet (often in HP in the US) against a generator or panel rating (often in kW).
The unit your starting value is in.
The result shows the equivalent in the other unit.
Converted power
6.705 HP
They open the calculator with your figures already in it
kW to Horsepower Calculator: 6.71 HP — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- 1 mechanical horsepower = 550 ft·lbf/s = 745.699872 watts, exactly
Inputs used
- Power (kW or HP)
- 5
- Converting From
- Kilowatts (kW)
What this calculation does not cover
- The horsepower that comes back is arithmetic, not a size anyone builds. IEC motors are sold in kilowatt steps of 3, 4, 5.5, 7.5 and 11, NEMA motors in horsepower steps of 3, 5, 7.5 and 10, and the two ladders do not line up: a 4 kW machine converts to 5.36 HP, which no manufacturer stocks. Dropping to the 5 HP below gives away margin the original selection had; going up to 7.5 HP changes frame size, shaft diameter and starter rating, and the new frame rarely bolts to the old holes.
- A kilowatt figure on a European nameplate is a shaft rating tied to a duty class and to reference conditions, normally S1 continuous duty at 40 degrees C ambient and no more than 1,000 m altitude. An S2 or S3 plate is a short-time or intermittent rating the motor cannot hold all shift, and a machine working hotter or higher than those reference conditions has to be derated before it delivers its plate. The conversion carries the number and none of the conditions printed beside it.
Add the equipment this sizes
This result is a specification — 6.705 HP — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-06 · in the site-wide review of 2026-09-06 · v1.0.1
Regulatory standards & verification citations1
- 1 mechanical horsepower = 550 ft·lbf/s = 745.699872 watts, exactly
Cite this page
Your workspace
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