Calculate HP from Trap Speed

Vehicle weight in pounds
(including driver)
 lbs

Trap speed at end of 1/4 mi in m.p.h.
 m.p.h.


Your Making : HP
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Calculate HP from ET

Vehicle weight in pounds
(including driver)
 lbs

ET in seconds
 sec


Your Making : HP
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Calculate Tire Diameter
Tire width - Series - Wheel Diameter
Example 275 - 60 R 15
Tire Width
 		Tire Series
 		Wheel Diameter


Tire diameter in inches
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Calculate mph for RPM range
Tire diameter
 		Gear Ratio

This calculation assumes the car's transmission is in drive or 1:1 ratio, no overdrive. For Overdrive cars multiply the overdrive ratio times the rear and gear ratio. Example a 700R4 transmission has an overdrive ratio 0.7:1. For a 4.11 rear end multiply 4.11 x 0.7 = 2.877. Enter 2.877 as the number for the gear ratio to calculate speeds in overdrive.
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1000 rpm mph 4500 rpm mph
1500 rpm mph 5000 rpm mph
2000 rpm mph 5500 rpm mph
2500 rpm mph 6000 rpm mph
3000 rpm mph 6500 rpm mph
3500 rpm mph 7000 rpm mph
4000 rpm mph 7500 rpm mph


Calculate Rear End Gear Ratio
Enter the tire diameter in inches, rpm's of the motor at a certain speed as indicated by your speedometer in mph. This calculation assumes the car's transmission is in drive or 1:1 ratio, no overdrive.
Tire Diameter (in)
 		RPM
 		Speed at RPM (mph)


Rear End Gear Ratio
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Compression Ratio Calculator

All measurement are in inches with the exception of the "Head cc's" and "Piston Notch or Dome cc's". If the piston has a "Notch" or "Dished" top, enter the variable as a positive number. If the piston has a "Dome", enter the variable as a negative number (type a "-" sign in front of the number). If the piston is a flat top enter the number zero (0).

Bore Stroke Head cc's Gasket Thickness  Deck Height Piston Notch [+] or Dome [-] cc's


Displacement in Cubic Inches
Compression Ratio

 

1/8-MILE TO 1/4-MILE CONVERSION TABLE

1/8-mile ET 1/4-mile ET   1/8-mile ET 1/4-mile ET   1/8-mile ET 1/4-mile ET  

1/8-mile ET

1/4-mile ET 5 7.80   6.8 10.61   8.55 13.34   10.3 16.07 5.05 7.88   6.85 10.69   8.6 13.42   10.35 16.15 5.1 7.96   6.9 10.76   8.65 13.49   10.4 16.22 5.15 8.03   6.95 10.84   8.7 13.57   10.45 16.30 5.2 8.11   7 10.92   8.75 13.65   10.5 16.38 5.25 8.19   7.05 11.00   8.8 13.73   10.55 16.46 5.3 8.27   7.1 11.08   8.85 13.81   10.6 16.54 5.35 8.35   7.15 11.15   8.9 13.88   10.65 16.61 5.4 8.42   7.2 11.23   8.95 13.96   10.7 16.69 5.45 8.50   7.25 11.31   9 14.04   10.75 16.77 5.5 8.58   7.3 11.39   9.05 14.12   10.8 16.85 5.55 8.66   7.35 11.47   9.1 14.20   10.85 16.93 5.6 8.74   7.4 11.54   9.15 14.27   10.9 17.00 5.65 8.81   7.45 11.62   9.2 14.35   10.95 17.08 5.7 8.89   7.5 11.70   9.25 14.43   11 17.16 5.75 8.97   7.55 11.78   9.3 14.51   11.05 17.24 5.8 9.05   7.6 11.86   9.35 14.59   11.1 17.32 5.85 9.13   7.65 11.93   9.4 14.66   11.15 17.39 5.9 9.20   7.7 12.01   9.45 14.74   11.2 17.47 5.95 9.28   7.75 12.09   9.5 14.82   11.25 17.55 6 9.36   7.8 12.17   9.55 14.90   11.3 17.63 6.05 9.44   7.85 12.25   9.6 14.98   11.35 17.71 6.1 9.52   7.9 12.32   9.65 15.05   11.4 17.78 6.15 9.59   7.95 12.40   9.7 15.13   11.45 17.86 6.2 9.67   8 12.48   9.75 15.21   11.5 17.94 6.25 9.75   8.05 12.56   9.8 15.29   11.55 18.02 6.3 9.83   8.1 12.64   9.85 15.37   11.6 18.10 6.35 9.91   8.15 12.71   9.9 15.44   11.65 18.17 6.4 9.98   8.2 12.79   9.95 15.52   11.7 18.25 6.45 10.06   8.25 12.87   10 15.60   11.75 18.33 6.5 10.14   8.3 12.95   10.05 15.68   11.8 18.41 6.55 10.22   8.35 13.03   10.1 15.76   11.85 18.49 6.6 10.30   8.4 13.10   10.15 15.83   11.9 18.56 6.65 10.37   8.45 13.18   10.2 15.91   11.95 18.64 6.7 10.45   8.5 13.26   10.25 15.99   12 18.72 6.75 10.53                  

 

 

 

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