The Complete Guide to Buying a Chainsaw

Why a Chainsaw Is Worth Owning (and Respecting)

A chainsaw is one of the most powerful hand-held tools available to a homeowner. It cuts through timber that would take hours with a hand saw, turns fallen branches into manageable pieces in minutes, processes firewood efficiently, and handles storm damage cleanup that would otherwise require calling in a professional.

It also demands more respect than almost any other garden tool you will own. A chainsaw's cutting chain travels at speeds that can inflict serious injury in a fraction of a second. Understanding the tool — its capabilities, its dangers, and the safety practices that protect you — is not optional. It is a prerequisite for ownership.

The good news is that modern chainsaws, particularly battery-powered models, have become significantly safer, lighter, and easier to use than the heavy petrol machines that dominated the market for decades. Safety features like automatic chain brakes, low-kickback chains, and inertia-activated stop mechanisms now come standard on quality models. Combined with proper safety equipment and basic training, a chainsaw is a tool that any responsible adult can learn to use safely and effectively.

This guide helps you choose the right chainsaw for your needs — no more powerful than necessary, equipped with appropriate safety features, and matched to the tasks you will actually perform.

Types of Chainsaw Explained

Chainsaws fall into three main categories based on their design and intended use.

Standard Rear-Handle Chainsaws

The conventional chainsaw design: a rear handle with a throttle trigger, a front handle with a hand guard, and a cutting bar extending forward. You hold it with both hands — one on each handle — with the bar in front of you.

This is the type most homeowners need. Rear-handle chainsaws are designed for ground-based work: cutting fallen trees and branches, bucking logs into firewood lengths, felling small trees, and clearing storm debris. They are available in every power source (battery, petrol, and corded electric) and in bar lengths from 30 cm (12 inches) to 50 cm (20 inches) or more for domestic models.

Mini Chainsaws and Pruning Saws

Mini chainsaws — typically 10–20 cm (4–8 inch) bar length, battery-powered, and designed for one-handed use — have become one of the best-selling garden tool categories. They are marketed as lightweight, accessible alternatives to full-size chainsaws for light pruning, branch trimming, and small cutting tasks.

What They Do Well

Mini chainsaws are genuinely useful for cutting branches up to about 8–10 cm (3–4 inches) in diameter, trimming shrubs, and tidying garden trees. They are light (often under 1.5 kg / 3.3 lb), start with a button press, and require no setup beyond charging the battery. For the gardener who occasionally needs to prune a few overhanging branches or cut back an overgrown shrub, a mini chainsaw is faster than hand tools and far less intimidating than a full-size saw.

The Honest Limitations

Mini chainsaws are not chainsaws in the traditional sense. They lack many of the safety features found on full-size saws — most notably, many budget mini chainsaws have no effective chain brake. The chain stops when you release the trigger, but there is no inertia-activated brake to stop the chain instantly in the event of kickback.

The one-handed operation that marketing emphasises is inherently less controlled than two-handed use. The saw is light and the chain speed is lower than a full-size model, which reduces (but does not eliminate) the severity of potential injuries. However, the chain is still sharp enough to cause deep cuts, and the compact size can encourage casual use without proper attention.

Battery life is limited — typically 15 to 40 minutes per charge depending on the model and what you are cutting. Attempting to cut material thicker than the saw is designed for causes the chain to jam, the motor to overheat, or both.

A Balanced View

Mini chainsaws fill a genuine gap between hand pruning tools and full-size chainsaws. Treat them as power pruning tools rather than miniature chainsaws: wear gloves and eye protection, use two hands where the design allows, do not attempt to cut material thicker than the bar length, and never use them overhead or on a ladder.

If your primary need is pruning overhead branches, a pole saw (covered in our separate pole saw guide) is a safer and more effective choice than a mini chainsaw held above your head.

Top-Handle Chainsaws: Professional Only

Top-handle chainsaws are designed for professional arborists working aloft in trees. The handle sits on top of the saw body rather than at the rear, allowing one-handed use while the other hand holds onto the tree or climbing equipment. They are compact, powerful, and extremely dangerous in untrained hands.

Top-handle chainsaws should not be purchased by homeowners for general garden use. They lack the stability of rear-handle designs and are specifically intended for trained professionals who understand the risks. This guide does not cover top-handle selection — if you need arborist-grade equipment, seek professional guidance.

Power Source: Battery, Petrol or Mains?

The power source determines the chainsaw's weight, noise, maintenance requirements, and suitability for different tasks.

Battery (Cordless) Chainsaws

Battery chainsaws have improved so dramatically that top-tier models now match the cutting speed and power of mid-range petrol saws. They dominate the domestic market for good reason.

Strengths

Push-button start — no pull cord, no choke, no fuel mixing. Significantly quieter than petrol. No exhaust fumes, making them safe to use in enclosed or semi-enclosed spaces (such as cutting inside a shed or garage, with appropriate ventilation for sawdust). Lighter than equivalent petrol models. Lower vibration, reducing fatigue during extended use. Minimal maintenance.

Battery chainsaws share battery platforms with other cordless tools from the same manufacturer. If you already own a cordless mower, blower, or trimmer, buying a chainsaw on the same platform means your existing batteries and charger work with it — a significant cost saving.

Limitations

Runtime per charge is the main constraint. Most domestic battery chainsaws deliver 30 to 90 minutes of intermittent cutting on a single charge (cutting time, not total elapsed time — you cut, pause, reposition, cut again). For occasional home use — cutting a few branches, processing a fallen tree, preparing firewood for an evening — this is ample. For hours of continuous felling or log processing, petrol provides longer endurance without pausing to charge.

At the very top end of the power spectrum, petrol chainsaws still outperform battery for the heaviest, most demanding work — large-diameter hardwood, continuous felling operations, and professional forestry. For domestic use, the gap is now negligible.

Key Specifications

Voltage indicates the battery platform — higher voltage generally means more power. Common domestic chainsaw platforms are 18V (light duty), 36V/40V (mid-range), and 56V/80V (high performance capable of matching 40–55 cc petrol equivalents).

Brushless motors are essential in any serious battery chainsaw. They deliver more power per watt, run cooler, and last longer than brushed motors.

Chain speed (measured in metres per second, m/s) directly affects cutting performance. Higher chain speed means faster, cleaner cuts. Budget models run at 5–8 m/s; quality domestic saws operate at 12–20 m/s.

Petrol (Gas) Chainsaws

Petrol chainsaws remain the most powerful option and the choice for heavy-duty, extended, or professional use.

Strengths

Unlimited runtime (refuel and continue). Maximum available power for the toughest cuts. Complete independence from electricity or batteries — essential for remote locations, forest work, and extended operations.

Limitations

Louder, heavier, and higher-vibration than battery equivalents. Require regular maintenance: fuel mixing (two-stroke engines need oil mixed with petrol at the manufacturer's specified ratio), spark plug replacement, air filter cleaning, and fuel system care. The pull-start mechanism can be difficult, especially in cold weather.

Petrol chainsaws produce exhaust fumes and must not be used in enclosed spaces.

Engine Size Guide

Engine displacement (cc) indicates power. For domestic chainsaw use:

Up to 35 cc: Light-duty — pruning, trimming, cutting small branches.

35–45 cc: Medium-duty — the most versatile range for homeowners. Handles firewood processing, small tree felling, and general garden work.

45–60 cc: Heavy-duty — larger trees, hardwood, and demanding conditions. More saw than most homeowners need.

Above 60 cc: Professional and forestry grade. Not intended for casual domestic use.

Corded Electric Chainsaws

Corded chainsaws plug into a household power socket and offer unlimited runtime at the lowest purchase price. They are lighter and quieter than petrol and require almost no maintenance.

The cable limits your range and requires constant awareness to avoid cutting through it — a genuine risk with a tool that moves rapidly through a cutting arc. For tasks close to a power source — cutting firewood in a yard, trimming branches near the house — a corded chainsaw provides reliable, affordable performance. For anything requiring mobility or distance from a socket, cordless or petrol is more practical.

Bar Length: Matching Saw to Job

The bar (also called the guide bar) is the flat metal blade around which the chain travels. Its length determines the maximum diameter of wood you can cut in a single pass.

The Rule of Thumb

The bar should be at least 5 cm (2 inches) longer than the diameter of the wood you plan to cut. This ensures the chain clears the wood completely on each pass rather than requiring multiple cuts from different angles — which is slower, less controlled, and increases kickback risk.

Practical Bar Length Guide

25–30 cm (10–12 inches): Light pruning, small branches, limbing. Compact and manoeuvrable. Common on battery and corded models for home use.

35–40 cm (14–16 inches): The most versatile range for homeowners. Handles most garden trees, firewood, and general cutting tasks. The 14-inch bar is the most popular domestic chainsaw size.

40–45 cm (16–18 inches): Larger trees and thicker logs. Suitable for regular firewood processing and managing mature garden trees.

45–50 cm (18–20 inches): Heavy domestic or semi-professional use. More saw than most homeowners need but appropriate for properties with significant tree management requirements.

The Important Caution

A longer bar is not automatically better. Longer bars add weight, increase the leverage forces acting on the operator, and create a larger kickback zone at the bar tip. A chainsaw that is manageable with a 35 cm bar can become unwieldy and dangerous with a 45 cm bar in the hands of an inexperienced user. Choose the shortest bar that comfortably handles your most common cutting tasks.

Chains: Types, Pitch and Safety Features

The chain is the cutting element — a loop of linked metal teeth that runs around the bar at high speed.

Chain Types

Full chisel chains have square-cornered teeth that cut fast and aggressively. They are efficient on clean, dry wood but dull quickly if they contact dirt or grit. They are more prone to kickback. Used primarily by experienced operators and professionals.

Semi-chisel chains have rounded-corner teeth that cut slightly slower but stay sharp longer, especially in dirty or gritty conditions. They are more forgiving and produce less kickback. These are the appropriate choice for most domestic users.

Low-kickback chains are specifically designed with features — including additional guard links between the cutting teeth — that reduce the tendency of the chain to kick the bar upward. Most domestic chainsaws are supplied with low-kickback chains as standard. If you replace the chain, choose a low-kickback replacement unless you have specific experience and reason to do otherwise.

Chain Pitch and Gauge

Chain pitch (the spacing between links) and gauge (the thickness of the drive links) must match the bar and sprocket on your specific chainsaw. These are not interchangeable — using the wrong chain is dangerous. When replacing a chain, match the specifications exactly to the original or consult the manufacturer's documentation.

Kickback: The Single Most Important Safety Concept

Kickback is the sudden, violent upward motion of the bar that occurs when the chain near the tip of the bar contacts an object (or the wood pinches the chain). It happens in a fraction of a second and drives the bar upward toward the operator's head and upper body. Kickback is the leading cause of serious chainsaw injuries.

How to Minimise Kickback Risk

Never cut with the tip of the bar. The upper portion of the bar tip is the "kickback zone." Contact with this area is what triggers kickback. Use the lower half of the bar for cutting.

Use a low-kickback chain and a reduced-kickback bar. These are standard on most domestic chainsaws and significantly reduce (but do not eliminate) kickback risk.

Keep the chain sharp. A dull chain requires more pressure to cut, increasing the likelihood of the chain catching and kicking back.

Hold the saw firmly with both hands. A secure two-handed grip gives you the best chance of controlling the saw if kickback occurs.

Be aware of the wood. Knots, nails, embedded wire, and hidden branches can trigger kickback. Inspect the wood before cutting.

The Chain Brake

The chain brake is a critical safety device that stops the chain almost instantly. It can be activated manually (pushing the front hand guard forward) or automatically (an inertia sensor detects the sudden deceleration of kickback and triggers the brake without any operator action).

Every chainsaw you buy should have an automatic inertia-activated chain brake. This is non-negotiable for safe operation. Budget mini chainsaws that lack this feature rely entirely on the operator to avoid and control kickback — a dangerous compromise.

Essential Safety Equipment

Chainsaw safety equipment is not optional. It is essential for every user, every time.

Chainsaw helmet with visor and ear defenders: Protects your head from falling branches, your face from flying debris, and your hearing from noise that exceeds safe levels even on battery models.

Chainsaw protective trousers or chaps: Contain layers of loose fibres that jam and stop the chain almost instantly if the saw contacts your legs. Leg injuries are the most common chainsaw accident.

Chainsaw boots: Reinforced with cut-resistant material. Steel-toed as a minimum; chainsaw-rated boots with full cut protection are better.

Gloves: Chainsaw-rated gloves protect your hands from vibration, cuts, and debris. The left hand (which holds the front handle nearest the chain) is most at risk.

Eye protection: If not using a helmet with a full-face visor, safety glasses or goggles protect against sawdust and wood chips.

The cost of proper safety equipment is modest compared to the cost of the chainsaw itself — and trivial compared to the consequences of an injury. Wear it all. Every time.

Key Features Worth Understanding

Chain Brake (Manual and Inertia-Activated)

As discussed above — the most important safety feature on any chainsaw. Non-negotiable.

Automatic Chain Oiler

Lubricates the chain and bar during operation, reducing friction, heat, and wear. Standard on all quality chainsaws. Check the oil reservoir level before each use and top up with bar and chain oil (not engine oil, not cooking oil — dedicated bar and chain oil).

Tool-Free Chain Tensioning

Allows you to adjust chain tension without a screwdriver or wrench. Chains stretch during use and need regular tightening — a quick, tool-free mechanism encourages you to maintain proper tension (which is critical for both performance and safety).

Anti-Vibration System

Reduces the vibration transferred to your hands and arms. More important than it sounds — excessive vibration causes fatigue, reduces control, and with prolonged exposure can lead to a condition called hand-arm vibration syndrome (HAVS). Quality chainsaws isolate the engine/motor from the handles with rubber mounts or spring systems.

Chain Catcher

A small metal or plastic guard beneath the bar that catches a broken or derailed chain before it can whip toward the operator. A valuable secondary safety feature.

Bumper Spikes (Bucking Spikes)

Metal teeth on the front of the saw body that dig into the wood, providing a pivot point for leverage during cutting. These improve control and reduce the effort needed for each cut. Common on larger saws, less common on compact models.

Maintenance: Keeping Your Chainsaw Safe and Effective

A well-maintained chainsaw is a safer chainsaw. Neglected maintenance causes poor cutting, increased kickback risk, and premature wear.

Before Every Use

Check chain tension — the chain should be snug against the bar but still move freely when pulled by hand (with the engine off). Top up bar and chain oil. Inspect the chain for damaged or missing teeth. Check that the chain brake engages and releases correctly.

Regular Maintenance

Chain sharpening: A dull chain is the most common cause of poor performance and increased risk. Sharpen the chain regularly using a file guide or take it to a professional sharpening service. Many users keep a spare sharp chain and swap them during use rather than sharpening in the field.

Bar maintenance: Periodically clean the bar groove (where the chain sits) of packed sawdust and debris. Rotate the bar occasionally (flip it over) to ensure even wear on both sides.

Air filter (petrol models): Clean or replace regularly — a clogged filter reduces performance and can damage the engine.

Spark plug (petrol models): Inspect and replace as specified by the manufacturer.

Battery care (cordless models): Store batteries at partial charge in a cool, dry place when not in use for extended periods. Follow the manufacturer's charging and storage guidelines.

What a Chainsaw Can and Cannot Do

A Chainsaw Is Good For

Cutting fallen trees and branches into manageable pieces. Processing firewood from rounds into smaller logs. Felling small to medium trees (with training and appropriate safety precautions). Limbing — removing branches from a fallen tree. Clearing storm debris.

A Chainsaw Is Not For

Cutting overhead. Never use a standard chainsaw above shoulder height — use a pole saw instead. Precision woodworking — a chainsaw is a rough-cutting tool, not a fine one. Cutting materials other than wood — stone, metal, plastic, and frozen ground will damage the chain and create dangerous situations. Untrained felling of large trees — this is professional work that requires training, experience, and proper equipment.

Common Mistakes Buyers Make

Buying More Chainsaw Than They Need

A 50 cc petrol saw with a 45 cm bar for occasional branch trimming is like buying a lorry for the school run. It is heavier, louder, harder to maintain, and more dangerous than necessary. Choose the smallest saw that comfortably handles your typical tasks.

Skipping Safety Equipment

Every chainsaw accident that involves an unprotected operator is preventable. The equipment exists specifically to keep you safe. The cost is modest. Wear it.

Neglecting Chain Sharpness

A dull chain makes the saw work harder, cut slower, and kick back more readily. Sharpening is the single most important maintenance task. A sharp chain pulls itself through the wood; a dull chain must be forced.

Ignoring Battery Ecosystem Compatibility

If you already own cordless garden tools, check whether a chainsaw is available on the same battery platform before buying a new, incompatible system.

Using a Mini Chainsaw as a Full Chainsaw

Mini chainsaws are pruning tools, not substitutes for proper chainsaws. Attempting to fell trees, cut thick logs, or perform heavy-duty work with a mini saw is ineffective and dangerous.

Operating Without Basic Training

If you have never used a chainsaw before, seek training. Many manufacturers, garden centres, and forestry organisations offer introductory chainsaw courses that cover safe starting, cutting techniques, and emergency procedures. The time invested is repaid many times over in confidence and safety.

Chainsaw Comparison Table

Pre-Purchase Checklist

• What will you primarily cut? Branches, firewood, small trees, or storm cleanup? This determines the bar length and power you need.
• How often will you use it? Occasional users are well served by battery. Frequent, heavy users may need petrol.
• Does the chainsaw have an inertia-activated chain brake? If not, do not buy it.
• Do you already own cordless tools on a battery platform? Check compatibility.
• Is the bar length appropriate for your most common tasks — long enough to be effective, short enough to be manageable?
• Have you budgeted for safety equipment — helmet, visor, ear defenders, chainsaw trousers/chaps, boots, and gloves?
• Do you know how to sharpen the chain, or do you have access to a sharpening service?
• Have you considered whether basic chainsaw training would be beneficial before your first use?
• Is the weight manageable for you during the duration of your typical cutting sessions?
• Does the chainsaw include bar and chain oil, or do you need to purchase it separately?

Why Buying Through Amazon Makes Sense

Amazon's chainsaw selection spans the full range from compact mini saws to professional-grade battery and petrol models. Product listings include bar length, chain speed, weight, noise level, and safety feature details — the specifications needed for a meaningful comparison.

Customer feedback is particularly valuable in this category. Real-world reports on cutting performance, battery runtime during actual use (versus manufacturer claims), ease of chain tensioning, and overall build quality provide insights that specification sheets cannot convey.

The accessory and safety equipment ecosystem on Amazon is also strong — replacement chains, sharpening kits, bar oil, protective trousers, helmets, and gloves are all available alongside the saws, often suggested as compatible additions during purchase.

Amazon Marketplace Protections

When you purchase through Amazon, several consumer protections apply. Products sold directly by Amazon are covered by standard consumer rights legislation, including the right to return items within a specified period.

For products sold by third-party sellers on the Amazon Marketplace, the A-to-Z Guarantee provides additional protection. If an item does not arrive, arrives damaged, or is materially different from what was described, Amazon will investigate and, where appropriate, issue a refund.

Amazon Renewed products — professionally inspected and restored items — come with their own guarantee, providing confidence when purchasing pre-owned chainsaws at reduced prices.

Manufacturer warranties apply in addition to Amazon's protections, covering manufacturing defects and premature component failure under normal domestic use.