To measure chainsaw chain pitch, measure the distance across three consecutive rivets and divide that distance by two. For example, if the three-rivet span measures 3/4 inch, the pitch is 3/8 inch. [1]
Pitch gives you a useful first clue when identifying a chain, but it is only one part of choosing a replacement. A clear measurement helps you compare the chain with the information for your saw before you buy. [2]
The calculation is simple, but small measuring errors can change the result, so take the span carefully and do the division before matching a chain. This section focuses on pitch; other chain dimensions also matter when you choose a replacement.
What you need before measuring
Before measuring chain pitch, gather a ruler or tape measure with clear inch markings and lay the chain flat enough to see its rivets. A clear view helps you locate the centers accurately rather than guessing from the chain’s outer edges. [2][1]
Choose a spot where the chain can rest without twisting or overlapping. Turn it so the rivets—the round metal fasteners joining the links—are easy to pick out. For example, if the links are crowded together near a bend, straighten that section before placing your measuring tool beside it. You may also find this useful: How to Count Chainsaw Chain Drive Links.
Use a tool whose markings let you read the small distances involved. A tape measure works, and a ruler is also practical if its inch marks are clear. [2] Keep the tool steady and line it up with the rivet centers; measuring from the middle of one rivet to the middle of another gives you a consistent reference point. [1]
Keep this check focused on pitch: pitch alone does not identify every dimension you need for a replacement chain. Treat your pitch measurement as one part of choosing a chain, rather than assuming it settles the entire fit. If you are preparing to shop, have the chain and saw information handy so you can check the other required details separately.
Measure the pitch in three steps
Choose three consecutive rivets. These are the small round metal pins that join the chain links. Pick three in a row so you can see the two gaps between them, rather than selecting rivets from different parts of the chain. [1][3]
Measure from the center of the first rivet to the center of the third. Keep your ruler aligned with the row of rivets and read the distance between those two centers. For example, if the first-to-third measurement is 3/4 inch, use that full distance for the calculation; do not measure just one gap between adjacent rivets. [1][3]
Divide the measured distance by two. If the measurement is 3/4 inch, divide 3/4 by 2 to get a pitch of 3/8 inch. [1]
If the marks are hard to read, take a moment to align the ruler with the rivet centers before calculating. The key is to use the first and third rivets in the selected row, then halve that measurement; changing which centers you measure can change the result. [3]
Check your result before buying a chain
Compare your result with the chain or saw documentation before buying a replacement. If the listed pitch differs from your calculation, pause and check your measurement and the exact chain information rather than choosing a chain based on a near match. [1]
Check the fit beyond pitch
Pitch identifies the spacing of the chain, but it is only one part of checking a replacement. Chain size also distinguishes pitch from gauge and drive links, so verify the other specifications your saw or chain documentation calls for before buying. [4] For example, a pitch match alone is not enough reason to assume a replacement will fit; compare the full set of required chain details. For more detail, see How to Measure Chainsaw Chain Gauge for a Proper Fit.
If the measurement looks off
If your result is unclear, repeat the measurement from the centers of the first and third rivets in a run of three. Measuring to the rivets’ outside edges can change the distance you read, so keep the endpoints at the centers and divide the new measurement by two. [1] If you still cannot match the result to the documentation, hold off on buying until you can confirm the chain identification.
Before you order, check the product description against the chain or saw information, not just the pitch label. If the documentation does not make the required specifications clear, ask a knowledgeable parts supplier to help identify a compatible chain.
Use the measurement to identify pitch
The useful takeaway is simple: measure across three consecutive rivets, then divide that distance by two to identify chain pitch. [1] Before choosing a replacement, confirm that result against the information for your chain or saw.
For example, if your measurement across three rivets is 3/4 inch, dividing by two gives a pitch of 3/8 inch. [1] Treat that result as a check to make against the chain or saw information, rather than relying on a visual guess when selecting a replacement.
Your next step is to look for the pitch listed on the chain or saw and compare it with your measurement. If the two do not agree, pause before buying and repeat the measurement carefully; use the confirmed pitch when you identify a replacement.