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Free Horsepower Calculator Compression Ratio Calculator Race Math Formulas and Racing Math Resources

High Performance starts with math, precise measurements and calculations.

We are pleased to share these helpful tools with our valued customers and guests. Please feel free to use these tools, bookmark this page for future use, and post links to this page for others to use. If there is other information you would like to see here please contact us and we will do our best to add the resources you need.

Mr. Gasket Hot Rod Calculator


At the track, see how weather and elevation will affect your times so you can instantly predict your dial-ins using current track conditions. Predict Elapsed Time and top speed for 1/4 mile or 1/8 mile runs. No computer, charts or workbooks needed.

This is also a great tool to use in the garage, trailer or on the road. It covers a huge range of calculations that are important to gearheads, everything from engine compression ration calculations to rear end gear ratio and tire size affects on rpm and mph.

  • Pre-programmed formulas for engine building and track tuning
  • Hand held, take it anywhere.
  • On the spot calculations of how engine modifications effect the vehicle setup.
The Hot Rod Calculator allows easy, on the spot, calculations of how engine modifications and at track vehicle setup changes can effect power output and track performance. Easy to use formulas for the professional or novice will show you how engine changes like compression ratio and air fuel mixture effect your engine's power and torque outputs. At the track, see how things like gear ratio changes or weather conditions can effect your E.T. (accurate weather data required). Hot Rod Calculator - Street and Strip performance calculator for use by racers, engine builders and automotive enthusiasts. This is the chance to know up front how changes will translate into power and performance, so before you spend your time or money, use the Hot Rod Calc to get the answers. Pre-programmed formulas for engine building and track tuning. Quick reference guide with 100s of formulas included for ease of use. Easy to use, self contained, no additional computer or monitors required (accurate weather data required for some ET calculations) Hand held, take it anywhere, and includes protective Armadillo case at no additional charge. Universal for or use to do any mathematical calculations related to engine performance and vehicle E.T.

We strongly endorse this product if you are serious about improving your vehicles performance and your success at the track.


Free Engine Piston Compression Ratio Calculator and Engine Size Calculator

Use this compression calculator tool to figure the compression you will get with the specifications you provide. You can change the head ccs, deck height, overbore size, etc. to see the affects on compression. This tool is a very accurate tool and can be tremendously helpful.

If you have the actual displacement in ccs of the exact head gasket you are using, you can get an even more accurate compression calculation by using those figures. To enter head gasket displacement volume, in the "Gasket Thickness" field enter ".0001". Then combine the gasket displacement ccs with the "Head" ccs. For instance, if you have a 64cc chamber and a head gasket displacement of 9.2 ccs, then in the "Head" ccs field enter "73.2".


This tool can also be used to find the final engine size based on any bore size, crankshaft stroke and number of cylinders. You can use this for example to see how big your stroker engine will actually be as far as displacement, based on different bore sizes or crank strokes. This tool is very accurate for displacement calculations. When using the tool for engine size calculations only you can put most any reasonable numbers in the fields that are used to calculate compression ratio, but you must put something in all fields for the tool to work. The 3 critical dimensions for displacement calculations are bore, stroke and number of cylinders.



Compression Ratio Calculator and Engine Size Calculator

Bore in
Stroke in
Head cc's
Gasket Thickness in
Deck Height in
Dish or Valve Pocket [-] or Dome [+] cc's
Number of Cylinders

Displacement Cubic Inches
Compression Ratio


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Free Horsepower Calculator

Engine Rear Wheel Horsepower Calculator Based on total vehicle weight and 1/4 mile MPH

To use this horsepower calculator enter the mph trap speed at the 1/4 mile mark from one of your dragstrip ET slips. Then enter the total weight of your vehicle, as raced, including the drivers weight. The best way to get the weight is to weigh your vehicle at the track with the driver seated in racing position. Then click the calculate button and rear wheel horsepower will be displayed. To run another calculation just click the clear button and start over.

Horsepower Calculator

Input 1/4 mile dragstrip finish line vehicle MPH  and as raced vehicle weight

MPH Weight HP
Enter the MPH and Weight then
click the calculate button



Helpful Racing Math Resources Engine Design and Blueprinting Books and More

A big part of building high performance engines, racing engines and vehicles involves math, numerous formulas, calculations and precise measuring of components to provide the absolute best performance possible.



Precision Measurement Tools

Building any engine requires a selection of precision measurement tools. When building a high performance engine, racing engine or blueprinting an engine, the quality of your measuring tools becomes even more important. Remember, these tools perform some of the most critical functions of your engine building process. Quality tools are an investment that will last a lifetime if properly cared for. Here is a selection of tools we hope you find helpful. 


Race Math Engine Math Racing Math Formulas and Conversion Info

GV (Head Gasket Volume) = Bore(in) X Bore(in) X 12.87

    X (Head Gasket Thickness in Inches)

DV (Below Deck Volume) = Bore(in) X Bore(in) X 12.87 

    X (Inches Below the Deck)

HV (Head Volume) = CC's

VV (Dish, Valve Pocket, Dome Volume) = CC's 

(Minus for dish or valve pockets, Plus for dome)

PV (Volume displaced by Piston) = Bore X Bore X Stroke X 12.87

Compression Ratio = (GV+DV+HV-VV+PV) / (GV+DV+HV-VV)

Cubic Inches = Bore x Bore X Stroke X Number of Cylinders X .7854

Convert Cubic Inches to CCs = Cubic Inches X 16.386

Convert Cubic Inches to Liters = Cubic Inches X .016386 

Engine in Liters = (Bore(mm) X Bore(mm) X Stroke(mm)

X Number of Cylinders X 12.87) / (16386 X 1000)

Engine in CCs = (Bore(mm) X Bore(mm) X Stroke(mm)

X Number of Cylinders X 12.87) / 16386

Convert CCs to Cubic Inches = CCs / 16.386

Convert Liters to Cubic Inches = Liters / .016386   

K1 Technologies Rods



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