How to convert 51 kW to horsepower
One kilowatt equals 1.34102 mechanical horsepower. For 51 kW:
51 kW × 1.34102 = 68.4 hp
Rounded, a 51 kW motor is rated at about 68 hp. European brochures often quote metric horsepower instead: 69 PS.
51 kW in other units
| Metric horsepower (PS) | 69.34 PS |
| Mechanical horsepower (hp) | 68.39 hp |
| Watts | 51,000 W |
| BTU per hour | 174,019 BTU/h |
What torque does 51 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 51 kW is produced at these speeds:
| Engine speed | Torque |
|---|---|
| 1,500 rpm | 325 Nm (239 lb-ft) |
| 2,500 rpm | 195 Nm (144 lb-ft) |
| 3,500 rpm | 139 Nm (103 lb-ft) |
| 4,500 rpm | 108 Nm (80 lb-ft) |
| 5,500 rpm | 89 Nm (65 lb-ft) |
| 6,500 rpm | 75 Nm (55 lb-ft) |
Running at 51 kW
A motor or heater running at 51 kW for one hour uses 51 kWh. At $0.17 per kWh that costs about $8.67 per hour.
51 kW as a charging rate
An EV charging at 51 kW adds 42 kWh (10–80% of a 60 kWh battery) in about 1 h 24 min, including roughly 10% charging losses and a realistic 65% average power on a DC fast charger.
Is 51 kW a lot?
Typical of small city cars with an entry-level engine – fine around town, slow on the highway.
Values around 51 kW
| kW | PS | hp |
|---|---|---|
| 47 kW | 63.90 PS | 63.03 hp |
| 48 kW | 65.26 PS | 64.37 hp |
| 49 kW | 66.62 PS | 65.71 hp |
| 50 kW | 67.98 PS | 67.05 hp |
| 51 kW | 69.34 PS | 68.39 hp |
| 52 kW | 70.70 PS | 69.73 hp |
| 53 kW | 72.06 PS | 71.07 hp |
| 54 kW | 73.42 PS | 72.42 hp |
| 55 kW | 74.78 PS | 73.76 hp |
Frequently asked questions
How many hp is 51 kW?
51 kW is 68.4 mechanical horsepower (68 hp rounded).
How many kW is 68 hp?
68 hp is 50.7 kW (hp × 0.7457).
How many PS is 51 kW?
51 kW is 69.34 metric horsepower (PS).
Is 51 kW a lot?
Typical of small city cars with an entry-level engine – fine around town, slow on the highway.
Last updated November 10, 2026