Gear Ratio Calculator
Drivetrain & Transmission Dynamics
Gear Ratio Calculator – Calculate Gear Ratios, RPM and Speed
Calculate vehicle speed based on engine RPM or solve for cruising RPM at high speeds. Includes transmission gear presets for Mustang MT82, 10R80, Tremec T-56, differential final drive options, and a complete multi-gear speed chart.
Drivetrain Ratios
Common Axle Ratios:
Tire Diameter & Operating Target
Calculated Vehicle Speed
64.1
mph
103.2 km/h
At 3,000 RPM in 1.00:1 gear with 3.73:1 final drive and 26.8" tire.
Total Overall Gear Ratio
3.73:1
Trans Ratio × Axle Ratio
Wheel Axle RPM
804.3 RPM
Revolutions at tire
Calculated Engine RPM
3,000 RPM
At 64.1 mph road speed
Tire Rolling Circumference
84.19 in
2,138 mm
Speed vs. Engine RPM by Gear (Mustang 6-Speed Setup)
| Gear (Ratio) | 2,000 RPM | 3,000 RPM | 4,500 RPM | 6,500 RPM (Redline) |
|---|---|---|---|---|
| 1st (3.66) | 11.7 mph | 17.5 mph | 26.3 mph | 38.0 mph |
| 2nd (2.43) | 17.6 mph | 26.4 mph | 39.6 mph | 57.2 mph |
| 3rd (1.69) | 25.3 mph | 37.9 mph | 56.9 mph | 82.2 mph |
| 4th (1.32) | 32.4 mph | 48.6 mph | 72.8 mph | 105.2 mph |
| 5th (1.00 Direct) | 42.7 mph | 64.1 mph | 96.2 mph | 138.9 mph |
| 6th (0.65 OD) | 65.7 mph | 98.6 mph | 147.9 mph | 213.7 mph |