All horsepower in the calculator is measured at the flywheel. 3500 Lbs. The quarter mile calculator employs three distinct empirical equations to determine the ¼-mile ET and trap speed estimates. This 1/8 Mile to 1/4 Mile conversion calculator is used to calculate the approximate time taken by a vehicle to run in a quarter mile (402.336 meter or 0.25 mile) track based on elapsed time taken by the same vehicle to reach eighth mile (201.168 meter or 0.125 mile) track. Calculators to find 1/4 mile ET and MPH. Calculate Rear End Gear Ratio: Enter the tire diameter in inches, the rpm’s of the engine at entered speed as indicated by your speedometer in mph. But the time may vary for different vehicles based on the running speed. 2400 Lbs. Automotive Calculators. 1/4-mile ET. Home; 1/4 mile Menu Toggle. Tire Diameter (in) RPM: Speed at RPM (mph) Final Rear Gear Ratio . 1/8-MILE TO 1/4-MILE CONVERSION TABLE. 1/8-mile ET. kg lb hp kW These are as follows: Roger Huntington's Equations: ET Equation: ET = 6.290 × (WT / HP) 1/3 MPH Equation: MPH = 224 × (HP / WT) 1/3. This calculator works out the density altitude based on the environmental conditions. 1/4-mile ET. 3000 Lbs. This calculator estimates your 1/8 mile and 1/4 mile elapsed time (ET) and speed. Main Menu. Skip to content. The Quarter Mile Drag Racing Calculator is a convenient, fast, and easy way to calculate the quarter mile ET (elapsed time) and HP (horsepower) in the quarter mile drag race. Reher-Morrison Super Series Engines - Estimated ET/MPH* Engine HP/TQ 1800 Lbs. Have Fun! 2200 Lbs. This calculator is for a 1:1 final drive ratio. 1/8-mile ET. Try some of my high performance racing calculators. Calculate your ET. 1/4 mile Menu Toggle. 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