As a rule of thumb, Mercury outboard motors feature 2.5-600 HP engines depending on the model. To be more precise, the engine power in each main class is as follows:
- Portable: 2.5-20 HP
- Midrange 25-115 HP
- High-Performance: 150-600 HP
If you want to find out more about the engine power of Mercury outboards, this post is for you.
We at PowerSportsGuide have compiled all you need to know under one roof!
How Much HP does a Mercury Outboard Have?
How Much HP Does a Portable Mercury Outboard Have?
The smallest Mercury outboard motors are the portable models, which are designed with 2.5-20 HP engines.
The available power sources in this breed are as follows:
- 85cc, single: 2.5, 3.5 HP
- 123cc, single: 4, 5, 6 HP
- 208cc, twin: 8, 9.9 HP
- 333cc, twin: 15, 20 HP
How Much HP Does a Midrange Mercury Outboard Have?
The engine power of midrange Mercury outboards is somewhere between 25 and 115 HP. These motors are powered by 4-stroke, inline-3, or 4-cylinder engines.
The available engine options and their HP ratings in this class include:
- 500cc, inline-3: 25, 30 HP
- 747cc, inline-3: 40 HP
- 995cc, inline-4: 40, 50, 60 HP
- 2065cc, inline-4: 75, 90, 115 HP
How Much HP Does a High-Performance Mercury Outboard Have?
Depending on their engine architecture, the power of high-performance Mercury outboards varies greatly.
The entry-level model in this class houses a 2999cc, inline-4 engine rated at 150 HP, while its bigger brothers house V6, V8, V10, and V12 engines. These power sources are rated at 175-600 HP depending on the model:
- 2999cc, inline-4: 150 HP
- 3452cc, V6: 175, 200, 225 HP
- 4572cc, V8: 200, 225, 250, 300 HP
- 5719cc, V10: 350, 400 HP
- 7554cc, V12: 500, 600 HP
Mercury Outboard HP Chart
For your convenience, we’ve compiled the average HP figures into one Mercury Outboard HP Chart:
| HP | Displacement (cc) | Cylinders |
| 2.5 HP | 85cc | 1 |
| 3.5 HP | 85cc | 1 |
| 4 HP | 123cc | 1 |
| 5 HP | 123cc | 1 |
| 6 HP | 123cc | 1 |
| 8 HP | 208cc | 2 |
| 9.9 HP | 208cc | 2 |
| 15 HP | 333cc | 2 |
| 20 HP | 333cc | 2 |
| 25 HP | 500cc | 3 |
| 30 HP | 500cc | 3 |
| 40 HP | 747-995cc | 3-4 |
| 50 HP | 995cc | 4 |
| 60 HP | 995cc | 4 |
| 75 HP | 2065cc | 4 |
| 90 HP | 2065cc | 4 |
| 115 HP | 2065cc | 4 |
| 150 HP | 2999cc | 4 |
| 175 HP | 3452cc | V6 |
| 200 HP | 3452-4572cc | V6-V8 |
| 225 HP | 3452-4572cc | V6-V8 |
| 250 HP | 4572cc | V8 |
| 300 HP | 4572cc | V8 |
| 350 HP | 5719cc | V10 |
| 400 HP | 5719cc | V10 |
| 500 HP | 7554cc | V12 |
| 600 HP | 7554cc | V12 |
Disclaimer: This chart is for informational purposes only! For more information, please check the owner’s manuals.
Takeaway – What are the Sizes of Mercury Outboard Motors?
As a rule of thumb, Mercury outboards produce 2.5-600 HP depending on their engine size and features.
The lightest portable models are powered by 72cc single (2.5/3.5 HP) or 123cc single (4/5/6 HP) engines.
In contrast, portable twin Mercury motors enjoy 208cc and 333cc power sources rated at 8/9.9 HP and 15/20 HP, respectively.
Engine options in the midrange class include a 500cc triple (25/30 HP), a 747cc triple (40 HP), a 995cc inline-4 (40/50/60 HP), and a 2065cc inline-4 engine (75/90/115 HP).
On the other end of the spectrum, you can find high-performance Mercury outboards marketed with many different engine configurations, including:
- 2999cc, inline-4: 150 HP
- 3452cc, V6: 175, 200, 225 HP
- 4572cc, V8: 200, 225, 250, 300 HP
- 5719cc, V10: 350, 400 HP
- 7554cc, V12: 500, 600 HP
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