Mercury RPM Chart
Mercury outboard engines are built to achieve peak efficiency and durability when operated within their specified Wide-Open Throttle (WOT) RPM range. Most modern Mercury outboards, including FourStroke and OptiMax platforms, are designed to operate within a recommended WOT range of 5,000–6,000 RPM, with optimal performance occurring near the upper end of that window under proper load.
Actual RPM targets vary by horsepower, gearcase style, and engine family. The Mercury propeller chart below outlines typical WOT RPM ranges based on Mercury specifications and marine propeller industry data.
Operating Guidance:
Propeller Pitch & RPM
Propeller pitch directly affects engine speed. If a Mercury outboard is unable to reach its rated RPM, the propeller is likely over-pitched. If the engine consistently exceeds recommended RPM, additional pitch may be required. In most cases, a one-inch pitch change results in an RPM shift of roughly 150–200 RPM.
Efficient Cruise Range
For everyday use, Mercury gasoline outboards commonly perform best when cruising at approximately 70–75% of rated maximum RPM, offering a balance of speed, fuel economy, and reduced wear.
Consult Official Specs
This Mercury propeller guide is intended for reference only. Always consult the specific Mercury owner’s manual for exact RPM limits, propeller recommendations, and setup guidance.
