Calculate chainsaw chain speed in ft/s, m/s, ft/min and mph from chain pitch, drive sprocket RPM and drive sprocket teeth for quick or detailed setup.
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Chain Speed Formula
- Pitch — chain pitch in inches (distance between three consecutive rivets, divided by two)
- Teeth — number of teeth on the drive sprocket (usually 6, 7, or 8)
- RPM — drive sprocket speed in revolutions per minute (engine RPM only with engaged 1:1 drive)
- 720 — converts in/min to ft/s (12 in/ft × 60 s/min)
The factor of 2 accounts for the fact that one chain link advances by two pitch-lengths per sprocket tooth (each drive link spans two rivets). For metric output, multiply ft/s by 0.3048 to get m/s. The Quick mode assumes a 7-tooth sprocket; select Custom sprocket for another tooth count.
Reference Tables
Common chain pitches and where you find them:
| Pitch | Typical Saw Class | Common Use |
|---|---|---|
| 1/4″ | Mini / carving | Top-handle, carving bars |
| .325″ | Mid-size homeowner | 40–55 cc saws |
| 3/8″ | Pro / large homeowner | 60+ cc saws, felling |
| .404″ | Large pro / harvester | Big timber, mills |
Speed ranges below are unit references, not universal cutting or safe operating recommendations:
| Chain Speed | Interpretation |
|---|---|
| Below 15 m/s (49 ft/s) | Compare with your manufacturer limits |
| 15–20 m/s (49–66 ft/s) | Compare with your manufacturer limits |
| 20–27 m/s (66–89 ft/s) | Compare with your manufacturer limits |
| 27–30 m/s (89–98 ft/s) | Compare with your manufacturer limits |
| Above 30 m/s (98 ft/s) | Compare with your manufacturer limits |
Worked Example
An illustrative .325″ pitch chain on a 7-tooth sprocket rotating at 13,500 RPM:
- 0.325 × 2 × 7 × 13,500 = 61,425 in/min
- 61,425 ÷ 12 = 5,118.75 ft/min
- 5,118.75 ÷ 60 = 85.3 ft/s (26.0 m/s)
This is a kinematic estimate, not a safe operating-speed recommendation. Follow the saw, chain, bar and sprocket manufacturer limits.
FAQ
Does bar length affect chain speed? At a fixed drive sprocket RPM, pitch and tooth count determine average chain speed. Bar length can affect load and thus actual RPM.
Should I measure RPM at idle or wide open? Use the drive sprocket RPM for the operating condition you want to estimate. Engine RPM is applicable only with an engaged clutch and 1:1 drive; actual speed under load varies. Do not infer a safe operating limit from this calculator.
Why does a bigger sprocket make the chain faster? More teeth mean more chain pulled per revolution. Going from a 7-tooth to an 8-tooth rim raises chain speed by about 14%, but it also loads the engine more and can pull RPM down if the saw is underpowered.
