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Horsepower to CC Converter — Lawn Mowers, Generators & Small Engines

Convert horsepower (HP) to cubic centimeters (cc) engine displacement. Calculate engine sizing for riding lawn mowers, portable generators, and pressure washers.

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CC
HP
Sync Performance Data

Profile in use: 4-Stroke Motorcycle

Tuned Conversion Tables

CC DisplacementEstimated HP
50 cc3.33 HP
125 cc8.33 HP
250 cc16.67 HP
500 cc33.33 HP
750 cc50.00 HP
1000 cc66.67 HP
2000 cc133.33 HP
5000 cc333.33 HP
Mechanical HPAvg. Displacement
1 HP15.0 cc
5 HP75.0 cc
10 HP150.0 cc
25 HP375.0 cc
50 HP750.0 cc
100 HP1500.0 cc
200 HP3000.0 cc
500 HP7500.0 cc

The Evolving Efficiency

Modern engine optimization has moved the baseline significantly. While legacy 4-stroke engines follow a 15cc-per-HP rule, high-performance racing platforms extract much more work, reaching as high as 1 HP for every 6cc of displacement.

Overview & Capabilities

Converting horsepower into cubic centimeters displacement assists homeowners and technicians replacing motors on lawn tractors, log splitters, and emergency backup powerheads. Because small engine manufacturers (Briggs & Stratton, Kohler, Honda GX) transitioned from traditional horsepower badges to displacement cc labeling, calculating required displacement ensures sufficient torque for mower deck cutting blades and hydraulic pumps.

Tutorial

How to Use

01
Enter the target power in Horsepower (HP).
02
Choose the equipment category (Push Mower, Riding Mower, Portable Generator, Commercial Equipment).
03
The engine calculates estimated engine displacement in cubic centimeters (cc).
04
Select matching replacement engines from small engine catalogs.
Capabilities

Key Features

Small engine displacement estimator (approx 30–35cc per HP for utility small engines)
Outdoor Power Presets: 4.5 HP Push Mower (140–160cc), 6.5 HP Pressure Washer (200–212cc), 13 HP Generator (390–420cc), 24 HP Riding Mower (720cc V-Twin)
Small engine replacement cross-reference guide
Instant responsive output
Applications

Common Use Cases

Mower Engine Replacement: Find a modern 160cc Briggs or Honda engine to replace an old 5.0 HP push mower motor.
Generator Sizing: Match a 13 HP engine requirement with a 389cc or 420cc displacement powerhead.
Pressure Washer Tuning: Determine the required cc displacement for a 3,000 PSI pump requiring 6.5 HP.
Guidance

Tips & Best Practices

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For small 4-stroke outdoor utility engines, 1 HP generally requires between 30cc and 35cc of displacement.
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A 6.5 HP utility engine typically corresponds to 196cc to 212cc.
Ecosystem

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Answers

Frequently Asked Questions

Q What cc engine replaces a 5 HP lawn mower?

A 5.0 HP lawn mower engine is typically replaced by a 140cc to 160cc small engine.

Q What cc is a 6.5 HP engine?

A 6.5 HP utility engine corresponds to approximately 196cc to 212cc (such as Honda GX200 or Predator 212).

Q What cc is a 13 HP generator engine?

A 13 HP engine corresponds to approximately 389cc to 420cc (such as Honda GX390).

Q Why did lawn mower manufacturers switch from HP to cc ratings?

Manufacturers switched from HP to cc ratings following a 2010 legal settlement regarding consistent power measurement standards.