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Motorcycle calculators
Each tool has its own page, its own fields, and the formula written next to the result. Sprockets, tire size, and fuel figures stay in this browser so you can move from one calculator to the next without retyping. Start with gearing if you have tooth counts, or with speed in gear if you also have a gearbox and a tire.
Motorcycle Gearing Calculator
Front and rear teeth become a final-drive ratio, with an optional stock pair for percent change.
Sprocket Calculator
Two pairs side by side, plus MPH at the same RPM when you add primary, one gear, and a tire.
Speed in gear
A table of estimated MPH from RPM, primary, gearbox ratios, sprockets, and tire size.
RPM at speed
The inverse model: road speed and one gear become estimated engine RPM.
Motorcycle MPG calculator
US gallons and MPG become miles of range, with an optional reserve.
Trip fuel
Distance divided by MPG, in US gallons or liters.
Engine displacement
Bore, stroke, and cylinders in cc and cubic inches.
Tire size
A motorcycle size such as 180/55-17 becomes estimated circumference.
Chain length
Pitch, teeth, and center distance become an even link count.