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Columns with a grey background are output.
Fill in all other columns and click the "Calculate" button to use.


Finding Horsepower with Weight and Trap Speed.
Vehicle
Weight (lbs)
1/4 Mile
Trap MPH
Your Estimated
Horsepower


Finding Horsepower from Torque and RPM.
Torque
(ft-lbs)
RPM HP


Finding ET and MPH with Weight and Horsepower.
Vehicle
Weight (lbs)
Horse-
Power
Estimated
E.T
Trap
Speed


Adjusting ET for Elevation.
Old ET (s) Elevation (ft) New ET


Finding RPM with Gear Ratio, Speed, and Tire Size.
OD is your transmission's overdrive ratio. If you do not have overdrive, use "1". If you have overdrive, but don't know the ratio, a good guess is ".7".

Gear
Ratio
Speed
(MPH)
OD
(see above)
Tire
Diam. (in)
RPM
Alternatively, you may use this calculator if you don't know your tire diameter. Instead, enter the 3 numbers listed on the side of the tire. For example, if the tire says something like "225/50/R16", use 225 for tire width, 50 for aspect ratio, and 16 for rim diameter.

Gear
Ratio
Speed
(MPH)
OD
(see above)
Tire Width
(mm)
Aspect
Ratio
Diameter of
rim (in)
RPM


Correcting Speedometer for New Tires.
Original Tire
Diam. (in)
New Tire
Diam. (in)
Speedometer
Reading
Real
Speed

Formulas for Bore, Stroke Displacement

Finding Displacement with Bore, Stroke, and # of Cylinders
Bore
(inches)
Stroke
(inches)
# of
Cyls
Displace-
ment (ci)
Displace-
ment (L)


Calculate Cylinder Volume
Bore Stroke Cylinder Volume


Calculate Stroke
Displacement Bore # cylinder Stroke

Formulas for Compression Ratio

Finding Effective Compression with Compression and Boost.
If your motor compression is 9:1, put 9 in the "motor compression" box.

Motor
Compression
Boost
(psi)
Effective
Compression


Calculate Chamber Volume
Cylinder Volume Compression Ratio Chamber Volume

Formulas for Fuel Requirements

Fuel Requirements in gallons per hour
This formula will calculate the approximate fuel needs for an engine based on horsepower at wide open throttle. The formula came from the Holley website. It's just a general guideline, but will get you in the ballpark. It says you should use about .5 lbs of fuel per hour per horsepower at wide open throttle.

HP@WOT Results