Horsepower Calculator
Calculate engine horsepower from torque and RPM, estimate HP from quarter-mile times, and convert between HP, kW, PS, and watts.
Horsepower Calculator
Torque · Quarter-Mile · Converter
HP = (Torque × RPM) / 5,252
HORSEPOWER
299.9 HP
HP REFERENCE
Horsepower of Famous Vehicles
From economy cars to hypercars — HP, torque, and 0-60 mph times.
| Vehicle | HP | Torque (lb-ft) | kW | 0-60 mph |
|---|---|---|---|---|
| Toyota Corolla (2024) | 169 HP | 151 lb-ft | 126 kW | 8.2 sec |
| Honda Civic Si (2024) | 200 HP | 192 lb-ft | 149 kW | 6.5 sec |
| Ford Mustang GT (2024) | 480 HP | 418 lb-ft | 358 kW | 4.2 sec |
| Chevrolet Camaro SS | 455 HP | 455 lb-ft | 339 kW | 4.0 sec |
| Tesla Model 3 Performance | 510 HP | 471 lb-ft | 380 kW | 3.1 sec |
| Dodge Challenger SRT Hellcat | 717 HP | 656 lb-ft | 535 kW | 3.6 sec |
| Lamborghini Huracán | 631 HP | 443 lb-ft | 470 kW | 3.2 sec |
| Ferrari SF90 Stradale | 986 HP | 590 lb-ft | 735 kW | 2.5 sec |
| Bugatti Chiron Super Sport | 1,578 HP | 1,180 lb-ft | 1,176 kW | 2.3 sec |
| Rimac Nevera (EV) | 1,914 HP | 1,740 lb-ft | 1,427 kW | 1.85 sec |
🔁 Torque and HP Curves Always Cross at Exactly 5,252 RPM
This is a mathematical certainty from HP = (Torque × RPM) ÷ 5,252 — not a coincidence, it's pure algebra. Below 5,252 RPM, torque is numerically higher than HP; above it, HP is higher than torque, purely because of how the units and constant work out.
🌀 Torque vs Horsepower
Torque is the rotational force an engine exerts — measured in lb-ft or Nm — and determines how hard the engine pushes at any instant. High torque at low RPM is why trucks and diesels feel strong pulling away from a stop. Horsepower = Torque × RPM ÷ 5,252, so it accounts for how fast you're applying that torque. A sports car making 300 lb-ft at 7,000 RPM produces about 400 HP, while a diesel truck making 400 lb-ft at 2,000 RPM only makes about 152 HP. HP governs top speed and sustained power; torque governs pull and towing capacity.
⚖️ Power-to-Weight Ratio
Raw horsepower means little without knowing the vehicle's weight. A 300 HP sports car weighing 2,800 lbs (9.3 lbs/HP) accelerates far faster than a 400 HP SUV at 5,200 lbs (13 lbs/HP). Formula: lbs per HP = vehicle weight ÷ HP — lower is faster. Reference tiers: 1-2 lbs/HP supercars, 5-7 lbs/HP performance cars, 8-12 lbs/HP average sedans, 16-20 lbs/HP heavy trucks, 25-40 lbs/HP heavy trucks/vans.
How to Calculate Horsepower — All Methods
Horsepower can be calculated multiple ways depending on what data you have available — from a dynamometer reading of torque and RPM, from a quarter-mile timing slip, or directly from power measurements in watts or kilowatts. Each method gives a slightly different perspective on engine performance.
Method 1: From Torque and RPM (Dyno)
HP = (Torque[lb-ft] × RPM) / 5,252
Example: 350 lb-ft @ 4,500 RPM → HP = (350 × 4,500) / 5,252 ≈ 300 HP
Metric: kW = (Torque[Nm] × RPM) / 9,549, then HP = kW / 0.7457Method 2: Trap Speed (Quarter-Mile)
Wheel HP = Weight[lbs] × (Trap Speed[mph] / 234)³
Example: 3,200 lbs, 105 mph trap → HP = 3,200 × (105/234)³ ≈ 289 HP (at the wheels)Method 3: Elapsed Time (ET)
Wheel HP = Weight[lbs] / (ET[sec] / 5.825)³
Example: 3,200 lbs, 13.5s ET → HP = 3,200 / (13.5/5.825)³ ≈ 257 HP (at the wheels)Power Unit Conversions
1 HP = 745.7 W = 0.7457 kW = 1.0139 PS
1 kW = 1.341 HP = 1.3596 PS · 1 W = 1.341×10⁻³ HP
200 HP = 149.1 kW = 202.8 PS · 300 HP = 223.7 kW = 304.2 PS · 500 HP = 372.9 kW = 506.9 PS— FAQ