Speed Per Gear Calculator

Build a per-gear table showing overall ratio, mph/km/h per 1,000 RPM, speed at redline, and engine RPM at a chosen cruise speed.

Tire & drivetrain

Build a speed-per-gear table from a real tire code or known diameter. Use transmission ratios in numerical gear order.

Tire input

Tire size

Final-drive ratio

Transfer-case ratio

Redline RPM

Cruise speed

Speed unit

Gear ratios

This is theoretical gearing geometry. It assumes no tire slip and no clutch/torque-converter slip. Do not use a calculated redline speed as a recommendation to drive at that speed.

Speed per gear RPM ↔ speed Gear ratio Speedometer error Tire size

Speed per gear

—Tire diameter

—Tire circumference

—Top-gear cruise RPM

—Gear rows

Connected drivetrain math

Road speed, engine RPM, tire circumference, transmission ratio and final drive describe the same geometric drivetrain relationship. WebToolArc keeps those assumptions visible and links tire-size changes to the speed/RPM consequences instead of hiding everything behind one unexplained number.

Real-world boundary

These are theoretical geometry calculations, not vehicle fitment or safe-speed recommendations. Loaded tire radius, pressure, wear, wheel/tire construction, tire growth, clutch or torque-converter slip, drivetrain losses, electronic calibration and vehicle-specific clearances can change real measurements. Confirm safety-critical fitment and calibration with vehicle/tire/wheel manufacturer data or a qualified professional.