What Chainsaw Size Do You Need to Cut Trees? Bar Length & Power Guide

Choosing the right chainsaw size to cut trees is one of the most important decisions for both homeowners and professionals. A chainsaw that is too small won’t have the power or bar length to handle thicker trunks, while one that is too large can be heavy, dangerous, and tiring to use. The key is finding the right balance between chainsaw bar length, engine power, and the size of the tree you plan to cut.

In this guide, we’ll break down how to choose the right chainsaw size, explore different cutting needs, and share practical tips so you can cut trees safely and efficiently.

Why Chainsaw Size Matters

The “size” of a chainsaw usually refers to the bar length, which is the part of the saw that guides the cutting chain. Chainsaws typically range from 12 inches to 36 inches, although most homeowners use bars between 14–20 inches.

The bar length determines how large of a tree you can cut. For example:

• A 14-inch chainsaw works well for pruning small trees and cutting branches.
• An 18-inch chainsaw is versatile enough for firewood and medium-sized trees.
• A 20–24-inch chainsaw is better suited for felling large trees.

Choosing the right size prevents strain on the saw, reduces cutting time, and makes the job safer.

Best Chainsaw Size for a Homeowner, Rancher, Farmer, or Landowner

General Rule for Chainsaw Bar Length

A common rule of thumb is that your chainsaw bar should be 2 inches longer than the diameter of the tree you’re cutting.

For example:

• A 16-inch chainsaw can cut a tree up to about 14 inches in diameter.
• An 18-inch chainsaw can cut trees up to 16 inches in diameter.
• A 20-inch chainsaw can cut trees up to 18 inches in diameter.

This ensures you can make a single pass through the trunk without forcing the saw or making multiple cuts.

Recommended Chainsaw Sizes for Different Tasks

Not every cutting task requires a large saw. Here’s a breakdown of recommended sizes:

1. Pruning and Limbing Small Trees

• Best bar length: 12–14 inches
• Ideal for cutting small branches, shrubs, and light trimming.
• Lightweight and easy to maneuver, perfect for beginners.

2. Cutting Firewood and Small Trees

• Best bar length: 16–18 inches
• Works well for cutting logs, firewood, and trees up to medium thickness.
• A versatile choice for most homeowners.

3. Felling Medium Trees (12–18 inches thick)

• Best bar length: 18–20 inches
• Provides enough reach and power for common yard and property maintenance.

4. Large Trees and Professional Use

• Best bar length: 20–24 inches or longer
• Suitable for felling large hardwoods, forestry work, or storm cleanup.
• Requires more skill and strength to handle safely.

Engine Power and Chainsaw Size

Bar length isn’t the only factor—engine power matters too. If you use a long bar on a low-powered chainsaw, it won’t cut efficiently and could stall.

• Electric chainsaws: Best for small jobs, typically up to 16 inches.
• Battery-powered chainsaws: Growing in popularity, effective for light to medium work (12–18 inches).
• Gas-powered chainsaws: Offer more power, handle larger bars (18–24 inches or more), and are best for heavy-duty tree cutting.

When choosing a chainsaw, match the engine size (measured in cc or amps) with the bar length to ensure safe and efficient cutting.

Factors to Consider When Choosing Chainsaw Size

Several factors influence chainsaw recommendations by tree diameter:

• Tree Diameter: Under 10 inches: 12-16 inch bar, 30-40cc/40V; 10-20 inches: 16-20 inch bar, 40-60cc/60V; over 20 inches: 20-24 inch bar, 60cc+.
• User Experience: Beginners should start with smaller bars (12-16 inches) to reduce kickback risks.
• Power Source: Gas for heavy tasks (unlimited runtime), battery for portability (20-40 minutes charge).
• Wood Type: Hardwoods like oak require more power (50cc+) than softwoods like pine.
• Safety and Maintenance: Larger saws increase weight (12-20 pounds), raising fatigue risks, so maintain chain tension and sharpness.

Budget also plays a role: Entry-level saws ($200-$300) for small trees, pro models ($400+) for large.

Conclusion | What Chainsaw Size to Cut Trees?

The right chainsaw size depends on the diameter of the trees you’re cutting, your experience level, and the type of work you need to do. For most homeowners, a 16–18-inch chainsaw offers the best balance of power, versatility, and safety. If you’re dealing with larger trees or professional forestry work, a 20–24-inch chainsaw is more suitable.

Remember, bigger is not always better. A chainsaw that fits your tasks and skill level will keep you safe, efficient, and confident while cutting trees.

Frequently Asked Questions

What chainsaw size is best for cutting firewood?

For most homeowners, a 16–18 inch chainsaw is ideal for cutting firewood. It provides enough bar length and power to handle medium-sized trees and logs efficiently.

Can a 14-inch chainsaw cut trees?

Yes, but a 14-inch chainsaw is best for small trees, branches, and pruning. It may struggle with medium or large tree trunks.

What size chainsaw do I need for large trees?

For large trees, especially those over 18 inches in diameter, a 20–24 inch chainsaw with a powerful engine is recommended. Professional users often opt for even longer bars for heavy-duty work.

Should beginners use a large chainsaw?

No. Beginners should start with 14–18 inch chainsaws for better control and safety. Larger chainsaws are heavier and increase the risk of accidents if used improperly.

Does chainsaw engine power matter for tree cutting?

Yes. The engine size must match the bar length. A long bar on a low-powered saw will cut inefficiently and may overheat. Gas-powered saws are better for larger bars, while electric saws suit small to medium bars.

Can one chainsaw size handle all types of trees?

A 16–18 inch chainsaw covers most homeowner tasks, but for large or hardwood trees, you may need a bigger saw. Professionals often use multiple saw sizes for different tasks.

What is a good size chainsaw for a homeowner?

A good size chainsaw for a homeowner is a medium-sized chainsaw, such as one with a 16 to 18 inch bar and chain. This type of chainsaw can handle trees that are up to 1 foot in diameter and 15 feet tall. If you need to cut larger trees, consider using a full-size chainsaw, such as one with a 20 inch bar and chain. A 14 inch chainsaw will not be able to handle larger trees.

Is a 16 inch chainsaw big enough?

Yes, a 16 inch chainsaw is big enough for most tree cutting tasks. It is a medium-sized chainsaw and can handle trees that are up to 1 foot in diameter and 15 feet tall. If you need to cut larger trees, consider using a full-size chainsaw, such as one with a 20 inch bar and chain. A 16 inch chainsaw will not be able to handle larger trees.

Is a 14 inch chainsaw big enough?

A 14 inch chainsaw is a medium-sized chainsaw. It can handle trees that are up to 1 foot in diameter and 15 feet tall. If you need to cut larger trees, consider using a full-size chainsaw, such as one with a 20 inch bar and chain. A 14 inch chainsaw will not be able to handle larger trees.

Is a 12 inch chainsaw big enough?

A 12 inch chainsaw is a small-sized chainsaw. It can handle trees that are less than 1 foot in diameter and 15 feet tall. If you need to cut larger trees, consider using a full-size chainsaw, such as one with a 20 inch bar and chain. A 12 inch chainsaw will not be able to handle larger trees.

What size chainsaw for medium trees?

Medium chainsaws are ideal for trees that are 15 to 40 feet tall and up to 1 foot in diameter. Most commonly found in gas-powered models, they typically weigh anywhere from 7 to 12 pounds. Medium chainsaws feature a 14 to 18 inch bar and chain and can tackle most tree trimming tasks.

What size chainsaw for small trees?

Small chainsaws can tackle trees that are less than 15 feet tall and up to 6 inches in diameter. These usually weigh anywhere from 3 to 8 pounds and are generally gas-powered. They are a great option for smaller jobs around the house and garden. Electric chainsaws are also available in this category and feature a 6 to 10 inch bar and chain. the Right Chainsaw for You!

How Big of a Tree Can a 20 Inch Chainsaw Cut?

Chainsaws are a powerful tool that can be used to cut through thick tree trunks. The size of the tree that a chainsaw can cut through depends on the size of the saw and the strength of the person operating it. A 20 inch saw can typically cut through a trunk that is up to 2 feet in diameter.

What Size Tree Can You Cut With 18 Inch Chainsaw?

You can cut a tree with a 18 inch chainsaw that is up to 2 feet in diameter.