5 Hp to Cc Calculator

Engine Power: HP to CC Calculator

Small Engines (e.g., Lawnmowers, 15cc/hp) Standard Average (17cc/hp) Older/Heavy Duty Engines (32cc/hp) Note: 1 HP is commonly estimated between 15cc and 17cc for modern small engines.

Estimated Displacement:

function calculateCC() { var hp = parseFloat(document.getElementById("hpInput").value); var ratio = parseFloat(document.getElementById("engineRatio").value); var resultArea = document.getElementById("resultArea"); var ccOutput = document.getElementById("ccOutput"); if (isNaN(hp) || hp <= 0) { alert("Please enter a valid horsepower value."); return; } var cc = hp * ratio; ccOutput.innerHTML = cc.toFixed(0) + " CC"; resultArea.style.display = "block"; }

Understanding the 5 HP to CC Conversion

In the world of small engines, such as those found on lawnmowers, pressure washers, and go-karts, users often need to convert Horsepower (HP) to Cubic Centimeters (CC). While there is no perfect mathematical constant because CC measures volume (displacement) and HP measures power (work), industry experts use general rules of thumb to estimate these figures.

How much CC is 5 HP?

For most modern 4-stroke overhead valve (OHV) engines, the common conversion factor is approximately 15cc to 17cc per 1 HP. Using our calculator:

• 5 HP x 15cc = 75cc
• 5 HP x 17cc = 85cc

Therefore, a typical 5 HP engine usually ranges between 75cc and 85cc. However, some older side-valve engines are less efficient and might require up to 30cc or 32cc to produce 1 HP, meaning an older 5 HP engine could be as large as 160cc.

Why is there no exact formula?

Converting HP to CC is difficult because several variables affect the output of an engine:

1. Engine Design: Two-stroke engines generally produce more power per CC than four-stroke engines.
2. Torque: Engines are often tuned for torque rather than raw horsepower, especially in gardening equipment.
3. Efficiency: High-performance engines use advanced fuel injection or cooling to get more HP out of a smaller CC displacement.
4. Manufacturer Ratings: Some brands rate their engines at maximum RPM, while others rate them at working RPM.

Common Conversion Examples

Horsepower (HP)	Estimated CC (Average)
1 HP	15cc – 17cc
3.5 HP	52cc – 60cc
5 HP	75cc – 85cc
6.5 HP	100cc – 110cc
10 HP	150cc – 170cc

Frequently Asked Questions

Is a higher CC always better?

Not necessarily. Higher CC means a larger engine volume, which often leads to more power, but it also means higher fuel consumption and more weight. Efficiency matters just as much as displacement.

What CC is a 5 HP Honda engine?

Most Honda engines in the 5 HP range (like the GC160) are actually around 160cc. This is because these engines are designed for high durability and high torque at lower RPMs, which requires a larger displacement ratio.