ganak.appAuto Calculators
11 calculators · Updated Jun 2026
Calculate tire sizes, gear ratios, engine RPM, and towing capacity for your vehicle. Whether you are upgrading wheels, tuning your drivetrain, or checking tow limits, these tools give you precise answers.
Popular in Auto
Tire Size Calculator
Compare tire sizes side by side for diameter, sidewall, circumference, revs per mile, speedometer error, and 3% tire size change safety.
Gear Ratio Calculator
Free gear ratio calculator for teeth, sprockets, bike gears, RPM and vehicle speed. Enter gear, tire or wheel data to get ratios, speed and torque.
Towing Capacity Calculator
Find how much your truck or SUV can tow using GVWR, GCWR, curb weight, payload, trailer weight, tongue weight, and hitch limits.
All Auto Calculators
RPM Calculator
Calculate RPM from speed, tire size and gear ratio, or RPM to speed. Includes pulley RPM, SFM/RPM, MPH, axle ratio and torque-to-HP formulas.
Dynamic Compression Calculator
Calculate dynamic compression ratio from bore, stroke, rod length, chamber volume, gasket specs, deck clearance, and intake valve closing timing.
Prop Slip Calculator
Calculate prop slip from RPM, gear ratio, prop pitch and GPS speed. See slip %, theoretical boat speed, speed deficit and pitch guidance.
2-Stroke Oil Mix Calculator
Calculate 2-stroke oil for any gas-to-oil ratio. Enter gallons or litres and get fl oz, mL, tablespoons, plus 50:1, 40:1 and 32:1 mix charts.
E85 Calculator
Use this E85 calculator to find how much E85 and pump gas to add for E20-E85 blends, with tank level, ethanol %, and octane estimates.
Quarter Mile Calculator
Use this quarter mile calculator to estimate ET, trap speed, required horsepower, and 1/8-to-1/4 mile conversions from weight, HP, and drivetrain loss.
0-60 Calculator
Estimate 0-60 mph time from horsepower and weight, find required HP, or convert quarter-mile ET. Includes WHP, drivetrain loss, and formula comparison.
USADiminished Value Calculator
Estimate your car's diminished value after an accident with 17c and market-based methods. See value loss, post-accident value, and claim guidance.
Why Use Auto Calculators?
Getting tire sizes wrong affects your speedometer accuracy, fuel economy, and ride quality. Gear ratio miscalculations can leave your engine over-revving or struggling. These calculators let you compare tire sizes side by side, find the right gear ratios for your setup, and verify your towing capacity before hitching up — all backed by precise formulas used by automotive engineers.