How Do You Find Your Chainsaw Chain Size?

On this page (8 sections)

1. What measurements determine chainsaw chain size?
2. Where should you check your chainsaw chain size?
3. How can you check an old chain’s size?
4. Why is bar length not enough to identify chainsaw chain size?
5. Which replacement chain suits your saw?
6. What should you check before buying a replacement chain?
7. How do you set up and care for a replacement chain?
8. How do you choose the right chainsaw chain size?

Find your chainsaw chain size by matching its pitch, gauge, and drive link count to your saw and guide bar. Check the owner’s manual and bar markings before buying, because two chains for 16-inch bars can have different specifications.

Bar length narrows the choices, but it does not identify a complete chain size. A replacement also needs to match the bar groove, sprocket, and the saw’s approved setup.

What measurements determine chainsaw chain size?

Pitch, gauge, and drive link count determine whether a chain fits the saw and bar. Bar length and model information help you confirm the match, but none of those details alone is enough.

• Pitch measures the spacing between chain rivets using a standard calculation. It must match the saw’s sprocket and bar setup.
• Gauge is the thickness of the drive links that sit inside the guide bar groove. The chain gauge must match the groove width.
• Drive link count is the number of inward-facing links that travel in the bar groove. Count these links, not the cutting teeth.
• Bar length is the bar’s nominal size. It helps narrow replacement options, but it does not tell you the other three measurements.

Some chains use low-profile pitch. A marking that says “3/8” is not enough if your saw requires “3/8 low profile,” so confirm the exact wording in the manual or fit guide.

Where should you check your chainsaw chain size?

Start with the saw manual, then compare its specifications with the markings on the guide bar. The manual identifies the chain types approved for the saw, while bar markings can help confirm the installed setup.

Look for pitch, gauge, and drive link count in the manual. The guide bar may show some or all of those details near its base.

Wipe dirt away gently so you can read the markings, and do not guess if they are worn or incomplete.

If the manual and bar do not give a full match, use the saw or bar maker’s replacement guide. Oregon’s chain identification guide explains common chain markings and measurements.

How can you check an old chain’s size?

Use an old chain as a reference only if you know it fit the saw correctly. Its markings can help identify the size, and counting its drive links can confirm one key measurement.

How do you count chainsaw chain drive links?

Lay the chain on a clear surface and count the small links that point inward toward the bar groove. Mark the starting link or count in groups so you do not count one twice.

Do not count cutting teeth or connecting rivets. If the chain is damaged, tangled, or missing links, use the manual and bar markings instead of relying on the old chain.

Can a ruler confirm pitch or gauge?

A ruler is a poor way to confirm small chain measurements. It may help you recognize the scale, but a slight misread can lead to a chain that will not fit.

Use markings on the chain or bar, the manual, or the manufacturer’s fit guide. Gauge deserves particular care because it determines whether the drive links sit correctly in the bar groove.

Why is bar length not enough to identify chainsaw chain size?

Bar length tells you the nominal guide bar size, not the complete chain fit. You still need the correct pitch, gauge, drive link count, and compatibility with the saw’s sprocket.

The two Oregon chains below are both for 16-inch bars and have 3/8-inch low-profile pitch and 56 drive links. One has a .043-inch gauge, while the other has a .050-inch gauge, so they are not interchangeable unless the saw and bar specify that gauge.

The .043-gauge Oregon chain is a useful match for compatible 16-inch setups, including listed EGO, Makita, Greenworks, DeWalt, Milwaukee, and Toro models. Skip it if your bar calls for .050-inch gauge or another link count.

The .050-gauge Oregon chain suits compatible saws that need that thicker gauge, including some Echo models when used with Oregon-branded bars. Skip it if your bar specifies .043-inch gauge, or if you cannot confirm the required sprocket and bar fit.

Its three-chain pack also makes more sense when you want spares for a confirmed match.

For help choosing a compatible bar length, read what length chainsaw bar you need. If your chain is dull but undamaged, chainsaw sharpeners and sharpening kits can help you compare sharpening with replacement.

Which replacement chain suits your saw?

Choose by the exact saw and bar specifications, not by brand name alone. Some replacement chains cover a set of compatible models, while others are limited to particular saws.

The Stihl chain suits an owner of one of those models who wants a genuine Stihl replacement. Its 55 drive links differ from the Oregon chains above, so skip it for a setup that requires 56 links or for an unlisted saw model.

The DeWalt chain is the clearest choice when you own the DCCS670 and want the chain designed for its 16-inch bar. Skip it for another DeWalt model unless that saw’s manual confirms compatibility; the product facts here do not guarantee its pitch or gauge for other setups.

What should you check before buying a replacement chain?

Confirm five details before ordering: saw model, bar length, pitch, gauge, and drive link count. Check that the chain is approved for the saw and that the bar and sprocket use the same setup.

Compare the manual with the bar markings and the replacement’s specifications. If a measurement is missing or the two sources disagree, ask the saw or bar maker to confirm the right chain.

Do not choose by a similar model name or by a matching bar length alone.

Common buying mistakes include counting cutting teeth instead of drive links, confusing standard 3/8-inch pitch with 3/8-inch low-profile pitch, and assuming gauge is interchangeable. Another mistake is treating a compatibility list as universal: model variations can require a different sprocket or bar.

How do you set up and care for a replacement chain?

Install and tension the chain exactly as your saw manual directs. The chain must face the correct direction, sit in the bar groove, and have the specified tension before the saw is used.

A chain that is too loose can come off the bar, while one that is too tight can add strain to the saw. Check tension again as directed in the manual, especially after fitting a replacement.

Keep the chain and bar lubricated according to the saw’s instructions, and stop if the chain binds, sits unevenly, or does not move as it should.

Use the safety gear required by the manual. The guide to chainsaw safety gear for home use covers protective equipment, and how to store a chainsaw between jobs explains how to protect the saw between uses.

How do you choose the right chainsaw chain size?

Pick the replacement only after pitch, gauge, and drive link count match the saw and bar. Then use the model compatibility information to confirm the chain is intended for your setup.

Choose the Oregon .043-gauge chain when your confirmed fit calls for 56 links and that gauge. Choose the .050-gauge three-pack for a compatible setup that needs .050-inch gauge and 56 links, the Stihl chain for the specified Stihl models, or the DeWalt chain for the DCCS670.

If you cannot verify even one measurement, pause and check with the saw or bar maker before buying. A correct chainsaw chain size depends on the full setup, not the number printed on the bar.

Frequently asked questions

How do I know what size chainsaw chain I need?

Match the chain’s pitch, gauge, and drive link count to your saw and guide bar. Check the owner’s manual and bar markings, then count the old chain’s drive links if needed.

Bar length alone cannot confirm fit.

Is chainsaw chain size written on the bar?

Often, the guide bar has markings for chain pitch, gauge, or drive link count, but the markings vary by brand and model. If a number is missing or hard to read, use the saw manual or the bar maker’s fit guide to confirm it.

Can I use a different gauge chain?

No. The chain gauge must match the width of the guide bar groove.

A mismatch can prevent the chain from seating or moving correctly, so confirm the gauge in the manual or bar markings before choosing a replacement.

Does a 16-inch bar take a 16-inch chain?

A 16-inch bar generally calls for a chain sold for that bar length, but length alone cannot confirm fit. You also need the correct pitch, gauge, and drive link count, plus compatibility with the saw’s sprocket.