Quarter Mile Calculator
Estimate 1/4 mile ET and trap speed from weight and power.
NHRA Class Reference
| ET Range | Class | Trap Speed |
|---|---|---|
| < 7.0 sec | Pro Stock | 200+ mph |
| 9.0-9.99 | Super Stock | 140+ mph |
| 10.0-10.99 | Stock Eliminator | 125+ mph |
| 11.0-11.99 | Super Comp | 115+ mph |
| 12.0-13.99 | Street Legal | 100-115 mph |
| 14.0+ | Economy | <100 mph |
Quarter Mile Formulas
Elapsed Time (ET)
ET = 5.825 × (Weight / HP)^(1/3)
Based on Roger Huntington's formula
Trap Speed
Trap = 234 × (HP / Weight)^(1/3)
Speed at the finish line in MPH