Racing Calculators,
Engineering Guides &
Motorsport Tools
From the kart paddock to the drag strip — explore calculators, setup guides and reference data to understand your build.
Popular Calculators
Everything you need to calculate, compare and understand performance.
Editorial selections from the toolbox.
Gear Ratio Calculator
Find your final reduction. Compare gearing for speed and torque multiplication.
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Kart Speed Calculator
Calculate theoretical kart speed from engine RPM, sprockets and tire size.
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Quarter Mile Calculator
Explore empirical elapsed-time and trap-speed estimates from power and weight.
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Tire Size Calculator
Compare tire dimensions, sidewall height and geometric circumference.
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Torque to Horsepower
Connect torque, engine RPM and power with a transparent calculation.
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Chain Length Calculator
Estimate chain pitches, even link count and center-distance adjustment.
Open calculatorTools for Every Type of Racing
Whether you race on track, off-road or on the street, find the math behind your setup.
Latest Guides & Articles
Practical engineering guides, worked examples and performance insights.
PERFORMANCEGo-kart gearing: acceleration versus top speed
More reduction increases ideal wheel torque for a given engine torque, while lowering wheel speed at a given engine RPM. Neither relationship alone predicts lap time.
ENGINEERINGGo-kart jackshaft gearing explained
For a compound jackshaft, multiply the engine-to-jackshaft reduction by the jackshaft-to-axle reduction. Two sprockets fixed to one shaft share RPM.
RACING BASICSTorque versus horsepower: one operating point at a time
Torque measures turning moment. Power measures work per time and equals torque multiplied by angular speed, so RPM is essential when converting one to the other.
Additional Resources
Reference charts and useful engineering tools for racers and builders.
Turn Data Into Perspective
Use clear formulas and worked examples to make better-informed setup decisions.
- Transparent formulas and units
- Tools across racing disciplines
- Assumptions with every result
- Completely free
Before you run the numbers.
Are the tools free?
Yes. All 36 calculators are free and require no account. Copy results or share a link containing your inputs.
Does theoretical speed predict actual top speed?
It describes wheel travel at an entered RPM. Available power, traction, drag and slip determine whether that operating point is attainable.
Can I use metric and imperial units?
Yes. Input controls convert between unit systems; results always state their units. Road-speed tools include MPH and KPH.
How do I calculate a go-kart gear ratio?
Divide driven teeth by driving teeth: 60 rear teeth ÷ 12 front teeth = 5:1. Multiply any additional reduction stages.