How to Measure Chainsaw Chain Length the Right Way

Last Updated on November 10, 2026 by D. Ruddy

Measuring your chainsaw chain length correctly is essential for safe and efficient cutting. Whether you’re replacing a worn chain or buying a spare, knowing how to measure chainsaw chain length ensures compatibility with your saw. A properly sized chain improves performance and reduces wear on both the chain and the bar.

To measure chainsaw chain length, count the number of drive links or measure the pitch and gauge. Most chains have the size stamped on them, but manual measurement ensures accuracy.

What Tools You Need for Measurement

Before you start, gather the right tools to make the process smooth and accurate. Having these on hand prevents guesswork and ensures precision.

• Tape measure or ruler – For measuring pitch and overall length
• Calipers – Useful for precise gauge and pitch measurements
• Flashlight – Helps inspect chain markings in low light
• Chain breaker tool – Only if you need to remove the chain for detailed inspection
• Notepad and pen – To record measurements and avoid mistakes

Most chainsaw chains have their specifications printed on the side. Look for numbers like 3/8″, .325″, or .404″ (pitch) and .050″, .058″, or .063″ (gauge). If these are missing or worn off, manual measurement is your next step.

Tip: If your chain is still on the saw, loosen the bar nuts slightly to rotate it for better access to markings.

Understanding Chainsaw Chain Pitch

Pitch is the distance between any three consecutive rivets divided by two. It’s one of the most critical measurements for chain compatibility. The most common pitches are:

To measure pitch manually, pick any three consecutive rivets on the chain. Measure the distance between the first and third rivet, then divide by two. For example, if the distance is 0.75″, your pitch is 0.375″ (3/8″).

Important: Always measure between the centers of the rivets, not the edges, for accuracy.

How to Count Drive Links

The drive links are the teeth on the underside of the chain that engage with the bar’s sprocket. The number of drive links determines the chain’s length and must match your bar’s requirements.

1. Remove the chain from the saw by loosening the bar nuts and sliding the chain off.
2. Lay the chain flat on a clean surface, ensuring it’s not twisted.
3. Count every drive link – these are the protrusions that fit into the bar’s groove.
4. Check both sides if unsure, as some chains have alternating patterns.
5. Record the total count – this is your drive link number.

Drive link counts typically range from 40 to 100, depending on the bar length. For example, a 16″ bar often uses a 56-64 drive link chain, while a 20″ bar may require 72-80 drive links.

Warning: Never force a chain with the wrong drive link count onto your bar. This can cause derailment, excessive wear, or dangerous kickback.

Measuring the Gauge

The gauge refers to the thickness of the drive links, which must match the groove width in your bar. Using the wrong gauge can cause the chain to bind, overheat, or derail.

Common gauge sizes are .043″, .050″, .058″, .063″, and .080″. To measure:

1. Use calipers to measure the thickness of a drive link where it sits in the bar’s groove.
2. If calipers aren’t available, use a gauge card or compare it to a known standard.
3. Check your saw’s manual for the recommended gauge if unsure.

Most consumer saws use .050″ or .058″ gauges, while professional saws often use .063″. Heavy-duty or older models may use .080″.

Step by Step Guide to Measure Chainsaw Chain Length

Follow this methodical approach to ensure you get all measurements right the first time. Accuracy here prevents costly mistakes and ensures safety.

Step 1: Locate the Chain Markings

Check the side of the chain for stamped or printed specifications. Look for numbers like “3/8 .058 56DL” – this indicates pitch (3/8″), gauge (.058″), and drive link count (56). If found, you can skip manual measurement.

Step 2: Measure the Pitch

If markings are missing, measure the pitch as described earlier. Use a ruler to measure between three rivets and divide by two. For precision, measure multiple sets of rivets and average the results.

Step 3: Count the Drive Links

Remove the chain from the saw and lay it flat. Count each drive link carefully. Use a marker to mark every 10 links to avoid losing count.

Double-check by counting in reverse.

Step 4: Measure the Gauge

Use calipers to measure the thickness of a drive link. If calipers aren’t available, compare the link to a known gauge size using a chart or gauge card.

Step 5: Verify Bar Length Compatibility

Ensure the chain’s pitch, gauge, and drive link count match your bar’s specifications. Refer to your saw’s manual or check the bar’s markings for compatibility.

Tip: If you’re replacing an old chain, take it with you to the store to match it directly with a new one.

Common Mistakes to Avoid

Even experienced users make errors when measuring chainsaw chains. Here’s how to steer clear of the most frequent pitfalls.

• Mixing up pitch and gauge – These are two distinct measurements. Pitch is the distance between rivets, while gauge is the thickness of the drive links. Confusing them leads to incompatible chains.
• Counting teeth instead of drive links – The cutting teeth are not the same as drive links. Drive links are on the underside and engage with the bar.
• Ignoring the bar’s groove width – The gauge must match the bar’s groove width. A mismatch causes the chain to sit too loose or too tight.
• Measuring a stretched chain – Old chains stretch over time. Always measure a new chain or check the original specifications if your chain is worn.
• Assuming all chains fit all bars – Chains are not universal. Even if the length seems close, the pitch and gauge must match exactly.
• Skipping the manual check – Your saw’s manual lists compatible chain sizes. Always cross-reference your measurements with the manufacturer’s recommendations.

Warning: Using a chain with the wrong pitch or gauge can damage your saw, void warranties, and create dangerous operating conditions.

How to Read Chainsaw Chain Packaging

When buying a new chain, the packaging provides all the necessary specifications. Learning to read it ensures you pick the right replacement.

Look for the following on the package:

• Pitch – Often listed as a fraction (e.g., 3/8″) or decimal (.325″).
• Gauge – Shown as a decimal (e.g., .058″).
• Drive Link Count – Labeled as “DL” or “Links” (e.g., 56DL).
• Bar Length Range – Indicates the bar sizes the chain fits (e.g., 16-18″).
• Chain Type – Such as full chisel, semi-chisel, or low-kickback.

Example: A package labeled “3/8 .058 56DL 16-18″” means the chain has a 3/8″ pitch, .058″ gauge, 56 drive links, and fits 16-18″ bars.

Frequently Asked Questions

Can I use a chain with a different pitch on my saw?

No, the pitch must match exactly. Using a chain with a different pitch will not fit correctly on the bar and sprocket, leading to poor performance and potential damage to your saw. Always verify the pitch before purchasing a replacement chain.

How do I know if my chain is stretched?

A stretched chain will sag noticeably when the saw is idle and may not tension properly. To check, pull the chain around the bar by hand. If it feels loose or you can pull it away from the bar easily, it’s likely stretched and needs replacement.

What happens if I use the wrong gauge chain?

Using a chain with an incorrect gauge can cause it to sit too loose or too tight in the bar’s groove. A loose chain increases the risk of derailment, while a tight chain can overheat, bind, or cause excessive wear on the bar and sprocket.

Do all chainsaw chains have the same number of teeth as drive links?

No, the number of cutting teeth and drive links are different. The cutting teeth are on the top of the chain, while the drive links are on the underside. The drive link count is what determines chain length compatibility, not the number of cutting teeth.

Can I measure chain length without removing it from the saw?

Yes, but it’s more challenging. You can count the drive links while the chain is on the saw by rotating it slowly and marking each link as you go. However, removing the chain makes counting easier and reduces the risk of miscounting.

Final Thoughts

Measuring chainsaw chain length accurately is a straightforward process once you understand pitch, gauge, and drive link count. Always start by checking for existing markings on the chain, then use manual methods if needed. Double-check your measurements against your saw’s manual to ensure compatibility.

With the right chain, your saw will run smoothly, last longer, and keep you safe during operation.