When you aren't racing, the next best thing is bench-racing! That's not all these calculators are good for but they were written with the goal of being useful tools for quickly demonstrating the performance that different setups will yield for your car.

• Tire Size and Height - Determine what range of tire width/profile/wheel size and height combinations will meet your needs.
• Speed vs Gearing - Determine speed based on RPM and gearing.
• Octane for Compression - Determine a general feeling of what octane is needed for a particular compression ratio.
• Fuel Reference Table - Reference table for comparing different kind of automotive fuels.
• Fuel Requirements - Determine how much fuel is needed for a given horsepower.
• HP to Torque - Convert horsepower to torque (and vice versa) at a given RPM.
• Displacement and Compression Ratio - Determine displacement based on bore, stroke and number of cylinders.
• Rev Limit - Determine the mean piston speed for a given stroke and RPM.
• Quarter Mile - Determine ET and MPH from weight and horsepower.
• Eighth Mile to Quarter Mile - Estimate 1/4 mile ET based on 1/8 mile ET
• Airflow and Volumetric Efficiency - Determine airflow and volumetric efficiency based on displacement, air density and RPM.
• Linear Spring Rate - Determine spring rate based on wire and spring diameter, material, and number of active coils.