Gear Ratio Calculator

Calculate transmission ratio, vehicle speed, torque multiplication, and more.

Driving gear teeth (pinion)Input / driver gear
t
6 t80 t
Driven gear teeth (ring)Output / driven gear
t
6 t160 t
Engine speedInput RPM
rpm
500 rpm8,000 rpm
Wheel diameterTotal tire outer diameter
"
16"36"
Axle / final drive ratioDifferential ratio
:1
1.005.50

Gear ratio

3.077: 1

Overall ratio with axle: 11.477 : 1

Mid gear

Balanced acceleration and speed. General city driving.

Gear Ratios

Transmission ratio
3.0769 : 1
Final drive ratio
3.73 : 1
Overall ratio
11.4769 : 1
Step-up ratio (inverse)
0.3250

Speed & RPM

Vehicle speedAt 3,000 engine RPM
19.9 mph
Speed (km/h)
32.0 km/h
Output shaft RPM
975 rpm
Wheel RPM (with axle)
261 rpm

Torque Multiplication

Multiplication factorTransmission + axle combined
× 11.48
Transmission only
× 3.077
Estimated drivetrain efficiency
97%
Effective torque (if engine = 100 lb-ft)
1113 lb-ft

Reference — 6-Speed Manual

1st3.82 : 116 mph
2nd2.20 : 128 mph
3rd1.52 : 140 mph
4th1.15 : 153 mph
5th0.91 : 167 mph
6th0.74 : 183 mph

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