How to convert 3 kW to horsepower
One kilowatt equals 1.34102 mechanical horsepower. For 3 kW:
3 kW × 1.34102 = 4.0 hp
Rounded, a 3 kW motor is rated at about 4 hp. European brochures often quote metric horsepower instead: 4 PS.
3 kW in other units
| Metric horsepower (PS) | 4.08 PS |
| Mechanical horsepower (hp) | 4.02 hp |
| Watts | 3,000 W |
| BTU per hour | 10,236 BTU/h |
What torque does 3 kW give?
Power and torque are linked by engine speed: torque (lb-ft) = hp × 5,252 ÷ rpm, or torque (Nm) = kW × 9,549 ÷ rpm. If 3 kW is produced at these speeds:
| Engine speed | Torque |
|---|---|
| 1,500 rpm | 19 Nm (14 lb-ft) |
| 2,500 rpm | 11 Nm (8 lb-ft) |
| 3,500 rpm | 8 Nm (6 lb-ft) |
| 4,500 rpm | 6 Nm (5 lb-ft) |
| 5,500 rpm | 5 Nm (4 lb-ft) |
| 6,500 rpm | 4 Nm (3 lb-ft) |
Running at 3 kW
A motor or heater running at 3 kW for one hour uses 3 kWh. At $0.17 per kWh that costs about $0.51 per hour.
3 kW as a charging rate
An EV charging at 3 kW adds 42 kWh (10–80% of a 60 kWh battery) in about 15 h 24 min, including roughly 10% charging losses.
Is 3 kW a lot?
Small mopeds in Europe are limited to 4 kW. It is also similar to an electric kettle (2–3 kW) or a Level 1–2 home EV charging session.
Values around 3 kW
| kW | PS | hp |
|---|---|---|
| 1 kW | 1.36 PS | 1.34 hp |
| 2 kW | 2.72 PS | 2.68 hp |
| 3 kW | 4.08 PS | 4.02 hp |
| 4 kW | 5.44 PS | 5.36 hp |
| 5 kW | 6.80 PS | 6.71 hp |
| 6 kW | 8.16 PS | 8.05 hp |
| 7 kW | 9.52 PS | 9.39 hp |
Frequently asked questions
How many hp is 3 kW?
3 kW is 4.0 mechanical horsepower (4 hp rounded).
How many kW is 4 hp?
4 hp is 3.0 kW (hp × 0.7457).
How many PS is 3 kW?
3 kW is 4.08 metric horsepower (PS).
Is 3 kW a lot?
Small mopeds in Europe are limited to 4 kW. It is also similar to an electric kettle (2–3 kW) or a Level 1–2 home EV charging session.
Last updated November 10, 2026