How do I sharpen a chainsaw chain?
Switch the saw off, clamp the bar, and set the chain brake. Match a round file to the chain's pitch, seat a filing guide on a cutter, and file each cutter away from you with smooth strokes with a filing guide to set the angle, one side and then the other. Every third filing, lower the depth gauges. Wear gloves; replace a worn-out chain.
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By Kasra Taheri, Founder, LoclisPublished
Researched and drafted with AI, then checked claim by claim against the sources listed below before it was published. Prices and rules change; the dates beside each source say when it was last checked.
Step by step
Read when to stop and call a pro, further down this page, before you start.
Step 1: Secure the saw
Switch the saw off and fix the bar in a vise or on a stable surface, with the chain tensioned snugly so it does not move; the chain brake adds extra stability.[1]
Step 2: Find the file size
Measure the pitch (half the distance across three consecutive rivets) and pick the round file that matches it.[2]
Step 3: Seat the filing guide
Set the filing gauge on the chain with its arrows pointing in the chain's direction of rotation, touching the chain.[1]
Step 4: File the cutters on one side
Rest the file on both guide rollers and file each cutting tooth away from you with smooth strokes, giving every cutter the same number of strokes.[1]
Step 5: Turn the saw and repeat
Reposition the bar and file the cutters on the other side the same way.[1]
Step 6: Check the depth gauges
Every third filing, lower the depth gauges with a flat file and a depth gauge tool.[3]
Step 8: Re-check tension
Re-tension the chain to the manufacturer's setting before cutting.
The short method
Sharpening a chainsaw chain is a hand-filing job that most owners can do in the yard in a few minutes. You need a round file that fits your chain, a filing guide, a flat file and depth gauge tool, and gloves. The goal is to give every cutter the same length and the same angle.
Know when it is time
Extension guidance gives the signs that your saw needs sharpening. The saw is cutting crooked.[3] You have to press down hard to keep cutting.[3] You smell burnt wood as you cut.[3] University of Georgia Extension adds the telltale sign in the cut itself: if pressure must be applied to the saw to cut or the chips produced are fine and dust like, it is time to sharpen the chain.[2]
Pick the right file
Saw chain pitch determines the correct file size for sharpening.[2] To determine the pitch, measure any three consecutive rivets in the saw chain from center to center in 1/16-in. increments. One-half of this measurement is the pitch.[2] A saw dealer can match a file to the pitch.
File the cutters
Fix the bar so the saw cannot move, with the chain snug. A vise on a workbench is the easiest way, and the chain brake adds extra stability.[1] Place the filing gauge on the chain. The arrows on the filing gauge should point in the chain's direction of rotation,[1] so they face the nose of the bar.
Then place the file at a 90-degree angle in relation to the rollers on the filing gauge, resting on both rollers. The filing angle is then 25–35 degrees depending on the type of chain.[1] Now file the cutting tooth away from you, with smooth strokes.[1] Use the same number of strokes on every cutter so they stay the same length.
When one side is done, reposition the saw and file the cutters leaning the other way in the same manner. Wear gloves or place a shop towel or other heavy cloth over the chain to protect your hands from the sharpened cutters.[3]
Do not skip the depth gauges
Each cutter sits behind a small hump called a depth gauge that limits how deep it can bite. As the cutters shorten with filing, that gap shrinks and the saw starts to cut slowly. Chain manufacturers recommend that the depth gauge be lowered every third filing.[3] Set the depth gauge tool over the chain and file down anything that stands above it with a flat file, then round the front edge so it does not catch.
Do not overdo it. Filed too low, the depth gauge "will make the cutting tooth cut too deeply into the wood. The cut will then be more aggressive with high vibrations as a result. The risk of kickback increases".[1]
When to stop sharpening
Replacement is the better fix once the cutters are short. Husqvarna says it is time to replace the chain when the longest portion of the cutting tooth has been worn down to less than 4 mm, or if you find cracks.[1] The witness line on the cutter also marks the limit of a chain's life, and the chain must be replaced when filed to the witness line.[2] If you are unsure which to choose, read whether to sharpen the chain or replace it.
Stop and call a pro if
- The chain has a square chisel profile. It is challenging to hand file, and most users use a grinder or take the chain to a shop for sharpening.[2]
- Cutters are uneven, nicked or cracked. A shop can regrind it, or you can replace the chain.
- The saw still cuts crooked after sharpening. The bar, sprocket or an uneven chain may be the cause, which needs a look at the saw.
- You do not have a way to hold the saw steady. Take the chain to a sharpening shop instead of filing it in your hands.
Getting help in Virginia
Not everyone wants to file their own chain. See what shops charge in chainsaw chain sharpening costs in Virginia, browse blade and chain sharpening, or read more small engine repair answers.
When you are ready, describe the job and local pros can quote it.
Common questions
- How do I know my chain needs sharpening?
- Extension guidance lists the signs: the saw cuts crooked, you have to press down hard to keep cutting, you smell burnt wood as you cut, or the cut produces fine sawdust instead of chips. University of Georgia Extension puts it as pressure needed to cut or dust-like chips.
- What angle do I file a chainsaw chain at?
- Husqvarna says that with the file held at 90 degrees to the rollers on the filing gauge, the filing angle is 25–35 degrees depending on the type of chain. A filing gauge sets it for you, so check your chain's type and the saw's manual.
- How often should I file the depth gauges?
- Chain manufacturers recommend lowering the depth gauge every third filing, according to University of Missouri Extension. Husqvarna says every 3 to 4 filings, and also after hitting stone or gravel. The right height varies by chain, so use the saw's manual.
- Can I use a grinder instead of a file?
- A grinder or a shop is what most people use for the hardest chain types, such as square chisel, which University of Georgia Extension calls challenging to hand file. Round-file chain such as semi-chisel is described as simple to file or grind.
- When is a chain too worn to sharpen?
- Husqvarna says to replace it when the longest part of a cutting tooth is under 4 mm or if you find cracks. University of Georgia Extension says to replace it when it has been filed to the witness line.
Sources
- [1] Filing the chain (Chainsaw Academy), Husqvarna US. Checked October 27, 2026.
- [2] Chainsaw Chains and Bars (C1208), University of Georgia Cooperative Extension. Checked October 27, 2026.
- [3] Selecting and Maintaining a Chain Saw (G1954), University of Missouri Extension. Checked October 27, 2026.
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