CC To HP Conversion Chart For Lawn Mower

This chart provides approximate HP values for common lawn mower engine displacements, It accounts for both flathead and OHV engines, with a general approximation (CC/15) for comparison.

CC to HP Conversion Chart for Lawn Mower

CC to HP Calculator for Lawn Mowers

Enter Engine Displacement (CC): Select Engine Type:

Notes:
Flathead Engines: Older lawn mowers (pre-1980s) often use flathead designs, which are less efficient, yielding about 0.025 HP per CC.
OHV Engines: Modern mowers typically use overhead valve (OHV) engines, which are more efficient, yielding about 0.03 HP per CC.

How to Use the Calculator and Chart

Find Your Engine’s CC: Check the mower’s manual or engine label (e.g., Briggs & Stratton engines list CC on the flywheel shroud).
Determine Engine Type:
- Flathead: Common in older mowers (pre-1980s).
- OHV: Found in most modern mowers (post-1980s, more efficient).
Use the Calculator:
- Input CC and select engine type.
- Review both engine-specific and general HP estimates.
Cross-Check with Chart: Use the chart for quick reference or to verify calculator results.
Consider Real-World Performance: If possible, test the mower or check manufacturer HP ratings, as approximations vary ().

Example Calculation

For a 190 CC OHV lawn mower engine:

Calculator (OHV): 190 × 0.03 = 5.70 HP
General Approximation: 190 / 15 = 12.67 HP
Chart Reference: Matches ~5.70 HP for OHV, confirming the engine-specific estimate is more accurate for lawn mowers.

Related Lawn Mowing Cost Calculator

What Are CC and HP?

CC (Cubic Centimeters): Measures engine displacement, or the total volume of the engine’s cylinders. Larger CC generally indicates a larger engine, but not necessarily more power.
HP (Horsepower): Measures the engine’s power output, or how much work it can do. Higher HP means better performance for cutting thick grass or powering larger mowers.

Why Convert CC to HP?

Comparing Mowers: Manufacturers may list CC or HP, making it hard to compare engines. Conversion helps you estimate power output.
Choosing the Right Mower: HP indicates how well a mower handles tough tasks (e.g., 5–7 HP for push mowers, 10–15 HP for riding mowers).
Understanding Performance: Knowing HP helps gauge if a mower suits your lawn size or terrain.

Tips for Lawn Mower Buyers

Small Lawns (<1/4 acre): 140–190 CC (4–6 HP) is sufficient for push mowers.
Medium Lawns (1/4–1/2 acre): 190–305 CC (6–9 HP) for push or self-propelled mowers.
Large Lawns (>1/2 acre): 305–420 CC (9–15 HP) for riding mowers or tractors.
Check Torque: Some manufacturers list torque (ft-lbs) instead of HP, as it better measures cutting ability (). No direct torque-to-HP conversion exists.
Verify Specs: Cross-reference CC and HP with manufacturer data (e.g., Briggs & Stratton website) to avoid misleading ratings.

Limitations of Conversion

Approximations Only: Engine design, wear, and tuning affect actual HP ().
Not for High-Performance Engines: Lawn mower conversions differ from motorcycles or cars, which may yield 250–300 HP per 1000 CC ().
Manufacturer Variability: Briggs & Stratton, Honda, or Kohler engines may deviate from averages due to proprietary designs.

FAQs

How many horsepower is a 150cc lawn mower?

A 150cc lawn mower engine typically produces around 4.5 to 5.0 horsepower (HP), depending on the engine's efficiency and design. There is no exact conversion, but this is the average range for small engines.

How many CC is in 1 HP?

The general rule of thumb is:

1 horsepower ≈ 15 to 17 cc, but this varies depending on engine type and efficiency.

For small engines (like lawn mower engines), 1 HP is often estimated to be around 16–17 cc.

How many horsepower is a 200cc lawn mower?

A 200cc engine generally delivers around 6.0 to 6.5 horsepower. The actual power output can vary based on engine tuning and brand.

How many CC is a 6.5 HP lawn mower engine?

A 6.5 HP lawn mower engine typically has between 196cc and 210cc, depending on the engine design. A common example is the 196cc Honda GX200, which produces around 6.5 HP.

What does 150cc mean on a lawn mower?

“150cc” refers to the engine displacement, which is the total volume swept by all the pistons in the engine.

A 150cc engine means it can displace 150 cubic centimeters of air-fuel mixture.
Higher cc usually means more power and torque, though not necessarily better fuel efficiency.