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What Size Chainsaw Chain Do I Need? A Simple Guide
What Size Chainsaw Chain Do I Need? A Simple Guide
If you have ever tried to buy a replacement chainsaw chain and felt confused by all the numbers, you are not alone.
Many buyers assume they only need the bar length. In reality, a correct chainsaw chain fit depends on three core specs: pitch, gauge, and drive link count. Bar length matters too, but by itself it is not enough to guarantee the chain will fit.
This guide will show you exactly how to find the right size chainsaw chain, what the numbers mean, where to check them, and how to avoid ordering the wrong chain.
Quick Answer
To choose the right chainsaw chain, you need these 4 details:
- Bar length
- Chain pitch
- Chain gauge
- Number of drive links
The easiest way is to check the markings on your guide bar or old chain. If you cannot find the markings, remove the chain and measure it manually.
Why Chainsaw Chain Size Matters
Using the wrong chain size can cause more than a poor fit.
A mismatched chain may sit incorrectly in the guide bar, run poorly on the sprocket, cut badly, or fail to tension properly.
Choosing the correct size helps you:
- get smoother cutting
- reduce premature wear
- improve cutting control
- avoid fitting and tension problems
- make replacement ordering easier next time
The 4 Measurements You Need
1. Bar Length
Bar length is the usable cutting length of the guide bar, usually shown in inches such as 12", 14", 16", 18", or 20".
This is the first number most people know, but it is only one part of the full chain size. Two chainsaws with the same bar length can still use different chain specs.
Important:
Do not order a chain based on bar length alone.
2. Chain Pitch
Pitch refers to the size of the chain and how it matches the drive sprocket and guide bar.
Common pitch sizes include:
- 1/4"
- 3/8" Low Profile
- .325"
- 3/8"
- .404"
For many homeowner saws, common options are 1/4" P or 3/8" Low Profile, while larger saws often use .325" or standard 3/8".
3. Chain Gauge
Gauge is the thickness of the drive link that fits into the guide bar groove.
Common gauge sizes include:
- .043"
- .050"
- .058"
- .063"
If the gauge is wrong, the chain may be too loose or too tight in the bar groove.
4. Drive Link Count
Drive links are the bottom teeth-like parts of the chain that sit inside the guide bar groove.
The number of drive links determines the loop length of the chain.
Even if two chains have the same pitch and gauge, they still will not fit the same saw unless the drive link count is also correct.
The Easiest Way to Find Your Chainsaw Chain Size
Option 1: Check the Guide Bar
This is the easiest and fastest method.
Look near the base of the guide bar, especially close to where it mounts to the saw. Many bars are stamped with important size information such as:
- bar length
- pitch
- gauge
- sometimes drive link count or replacement code
A typical marking might look like this:
18" / .325" / .050" / 72DL
That means you need:
- 18-inch bar chain
- .325 pitch
- .050 gauge
- 72 drive links
Option 2: Check the Old Chain
If the guide bar markings are worn off, inspect your old chain.
Some chains have identifying marks stamped on the drive links. If the chain is original and fits well, it is often the best reference for ordering a replacement.
Option 3: Check the Owner’s Manual
Your owner’s manual may list the approved chain specs for your chainsaw model.
This is a reliable option if the saw is still using the original bar and sprocket setup.
Option 4: Measure It Manually
If you cannot find any markings, you can measure the chain yourself.
How to Measure a Chainsaw Chain Manually
Step 1: Measure the Bar Length
Measure from the front of the saw to the tip of the bar.
Round to the nearest standard bar length.
Example:
If the measured usable length is about 15.8 inches, it is generally considered a 16-inch bar.
Step 2: Find the Pitch
Pitch is measured using the rivets on the chain.
Measure the distance between three consecutive rivets and divide that number by 2.
Example:
- Distance across three rivets = 3/4"
- 3/4" ÷ 2 = 3/8" pitch
Step 3: Measure the Gauge
Gauge is the thickness of the drive link.
This can be difficult to measure accurately on a worn chain.
Use:
- a digital caliper for best accuracy
- the guide bar spec if still readable
- the old chain markings if available
Step 4: Count the Drive Links
Count every drive link around the full chain loop.
This is one of the most important steps. If the drive link count is wrong, the chain will not fit correctly even if the other numbers look right.
Example of a Complete Chainsaw Chain Size
A full chain size might be written like this:
18" / 3/8" LP / .050" / 62DL
This means:
- fits an 18-inch bar
- uses 3/8" low profile pitch
- has .050 gauge
- includes 62 drive links
That full combination is what you should match when buying a replacement.
Common Mistakes People Make
Ordering by bar length only
This is the most common mistake. A 16-inch chainsaw does not always use the same chain as another 16-inch chainsaw.
Confusing 3/8" and 3/8" Low Profile
These are not always interchangeable.
Ignoring drive link count
Even with the correct pitch and gauge, the chain still needs the right loop length.
Measuring a worn chain inaccurately
Worn chains can be harder to measure correctly.
Assuming all chains fit all brands
Fit is based on the spec combination, not simply the brand name.
The Most Common Chainsaw Chain Sizes
For many homeowner and farm-use saws, the most common gauge sizes are:
- .043
- .050
- .058
- .063
And common pitch options include:
- 1/4"
- 3/8" Low Profile
- .325"
- 3/8"
- .404"
Which Chain Is Best for Homeowners?
For light yard work, storm cleanup, firewood cutting, and general property maintenance, many homeowner saws use smaller or lower-profile chain setups designed for easier handling and smoother control.
If your store sells consumer-friendly replacement chains, this is a strong area to focus on in your internal links and product collections.
How to Make Sure You Order the Right Chain
Before buying, confirm all 4 details:
- bar length
- pitch
- gauge
- drive link count
If possible, compare:
- the guide bar marking
- the old chain marking
- the manual
- the product listing details
The safest match is the full spec combination, not just one number.
Final Thoughts
If you have been asking, “What size chainsaw chain do I need?”, the answer is simple:
You need the correct combination of bar length + pitch + gauge + drive links.
Once you know those four measurements, ordering a replacement chain becomes much easier. The fastest method is to read the guide bar or old chain. If those markings are missing, manual measurement is your backup.
For most buyers, taking two extra minutes to confirm the specs is the difference between ordering the right chain the first time and dealing with a return later.
FAQ
Can I replace my chainsaw chain with any 16-inch chain?
No. The bar length alone is not enough. You also need the correct pitch, gauge, and drive link count.
Where can I find my chain size?
Check the guide bar first. If the markings are gone, check the old chain, the owner’s manual, or measure the chain manually.
What do pitch and gauge mean on a chainsaw chain?
Pitch refers to chain size spacing and matching with the sprocket/bar system. Gauge is the thickness of the drive link that fits into the guide bar groove.
What happens if the gauge is wrong?
The chain may not sit correctly in the guide bar groove, which can lead to poor fit and poor performance.
How do I know how many drive links I need?
Count the drive links on the old chain, or check the chain/bar specification if listed.
Is 3/8 the same as 3/8 low profile?
No. They are commonly treated as different chain formats and should be matched correctly to the saw, guide bar, and sprocket.
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