What Does Peak Horsepower Mean on a Blender?
Peak horsepower is measured with the blade stalled rather than blending. At 745.7 watts per horsepower, peak-HP claims routinely imply more power than a household circuit can supply.
Horsepower is a unit of power, and one mechanical horsepower equals 745.7 watts. That makes every peak-HP claim directly convertible.
The catch is the measurement condition. Peak horsepower is taken at the moment the blade is stalled — the motor straining against a blocked load — not while it is spinning through food. It is not an operating state you would ever want to sustain.
Run the conversions and the pattern is clear: 2 peak HP implies about 1491 W, 3 peak HP about 2237 W, and 3.8 peak HP about 2834 W. The last two exceed what a 15-amp circuit can deliver.
None of this makes the claims false. It shows what they measure — and why they cannot be compared against a continuous rating.
Frequently Asked Questions
A standard US kitchen circuit is 15 amps at 120 volts, giving a hard ceiling of 1800 watts. Under the widely used 80% rule for continuous loads, only about 1440 watts is available on a sustained basis. Any claim of sustained power above that cannot be met at a normal household outlet.
Because the advertised figure is a momentary peak or a stalled-rotor horsepower conversion, not sustained draw. Those conditions last a fraction of a second and are not an operating state, so they do not conflict with the circuit limit in the way a sustained rating would.
One mechanical horsepower is 745.7 watts, so 3 peak horsepower implies about 2237 watts. That is more than a 15 amp circuit can deliver, which tells you the figure is measured with the blade stalled rather than while blending.