Listed gear-ratio data for 2018 Mercury 150 HP OptiMax Pro XS outboards. Match your exact model and lower unit; some models may have more than one gearcase configuration.
2018 Mercury 150 HP OptiMax Pro XS
Listed ratio values: 1.87:1
| Model | Gear ratio |
|---|---|
| 2011-2018 | 1.87:1 |
Use the ratio that matches your exact outboard model and lower unit, then enter it in the PropSlip calculator.