Quarter Mile Calculator
Estimate your vehicle's quarter mile elapsed time (ET) and trap speed. Enter your vehicle specifications to calculate drag racing performance metrics including 60-foot time and estimated quarter mile results.
## Quarter Mile Drag Racing Formulas
**Elapsed Time (ET) - Roger Huntington's Formula:**
ET = (Weight / Horsepower)^0.333 × 5.825
**Adjusted ET with Modifiers:**
ET = Base ET × Drivetrain Factor × Transmission Factor × Tire Factor
**Drivetrain Factors:**
- RWD: 1.0 (baseline)
- FWD: 1.05 (weight distribution penalty)
- AWD: 0.97 (traction advantage)
**Transmission Factors:**
- Manual: 1.0 (baseline)
- Automatic: 0.98 (faster shifts in modern autos)
**Tire Factors:**
- Drag Slicks: 0.94 (maximum traction)
- Performance: 0.97 (good traction)
- Street: 1.0 (baseline)
**Trap Speed Formula:**
Trap Speed = 234 × (HP / Weight)^0.333
**Additional Metrics:**
- 60 Foot Time ≈ ET × 0.175
- 0-60 mph ≈ ET × 0.45
- Power-to-Weight = Weight / Horsepower
**Example: Muscle Car**
**Vehicle Specs:**
- Weight: 3,800 lbs
- Horsepower: 450 HP
- Drivetrain: RWD
- Transmission: Automatic
- Tires: Performance
**Calculation:**
1. Power-to-Weight: 3,800 / 450 = 8.44 lbs/hp
2. Base ET: (8.44)^0.333 × 5.825 = 12.00 seconds
3. Drivetrain Factor: 12.00 × 1.0 = 12.00 seconds
4. Transmission Factor: 12.00 × 0.98 = 11.76 seconds
5. Tire Factor: 11.76 × 0.97 = **11.41 seconds**
**Additional Results:**
- Trap Speed: 234 × (450/3800)^0.333 = 118.5 mph
- 60 Foot Time: 11.41 × 0.175 = 2.00 seconds
- Estimated 0-60: 11.41 × 0.45 = 5.13 seconds
- HP per Ton: 236.8 hp/ton
- Performance Class: High Performance
🔗 Related Calculators
📐 Formula
## Quarter Mile Drag Racing Formulas
**Elapsed Time (ET) - Roger Huntington's Formula:**
ET = (Weight / Horsepower)^0.333 × 5.825
**Adjusted ET with Modifiers:**
ET = Base ET × Drivetrain Factor × Transmission Factor × Tire Factor
**Drivetrain Factors:**
- RWD: 1.0 (baseline)
- FWD: 1.05 (weight distribution penalty)
- AWD: 0.97 (traction advantage)
**Transmission Factors:**
- Manual: 1.0 (baseline)
- Automatic: 0.98 (faster shifts in modern autos)
**Tire Factors:**
- Drag Slicks: 0.94 (maximum traction)
- Performance: 0.97 (good traction)
- Street: 1.0 (baseline)
**Trap Speed Formula:**
Trap Speed = 234 × (HP / Weight)^0.333
**Additional Metrics:**
- 60 Foot Time ≈ ET × 0.175
- 0-60 mph ≈ ET × 0.45
- Power-to-Weight = Weight / Horsepower
📝 Example Calculation
**Example: Muscle Car**
**Vehicle Specs:**
- Weight: 3,800 lbs
- Horsepower: 450 HP
- Drivetrain: RWD
- Transmission: Automatic
- Tires: Performance
**Calculation:**
1. Power-to-Weight: 3,800 / 450 = 8.44 lbs/hp
2. Base ET: (8.44)^0.333 × 5.825 = 12.00 seconds
3. Drivetrain Factor: 12.00 × 1.0 = 12.00 seconds
4. Transmission Factor: 12.00 × 0.98 = 11.76 seconds
5. Tire Factor: 11.76 × 0.97 = **11.41 seconds**
**Additional Results:**
- Trap Speed: 234 × (450/3800)^0.333 = 118.5 mph
- 60 Foot Time: 11.41 × 0.175 = 2.00 seconds
- Estimated 0-60: 11.41 × 0.45 = 5.13 seconds
- HP per Ton: 236.8 hp/ton
- Performance Class: High Performance