Glue Clamping Pressure
Calculator
Results
- Total clamping force (N)
- 6,000
- Clamping pressure (MPa)
- 0.2
- Clamping pressure (psi)
- 29.007547
- Force per mm² (N)
- 0.2
Results
| Total clamping force (N) | 6,000 |
| Clamping pressure (MPa) | 0.2 |
| Clamping pressure (psi) | 29.007547 |
| Force per mm² (N) | 0.2 |
formula-map diagram
- Total clamping force (N)
- 6,000
- Clamping pressure (MPa)
- 0.2
- Clamping pressure (psi)
- 29.007547
- Force per mm² (N)
- 0.2
Formula map
Formula
P = (clamps × force per clamp) ÷ glue area= 6000
Note
This result is a simplified model; verify against your shop's own tolerances and material data before cutting.
More in Woodworking and metalwork
See all →Frequently asked questions
Why does glue need clamping pressure at all?+
Most woodworking glues, including PVA (yellow glue), need close, continuous contact between the two surfaces to form a strong bond and to squeeze out excess glue into a thin, even glue line. Without adequate pressure, gaps in the joint starve the bond and weaken it.
How does this calculator relate clamp force to pressure?+
Pressure equals clamping force divided by the glued surface area, so the same clamp force spread across a larger panel produces much less pressure per square inch than it would on a small joint, which is why large panel glue-ups need more clamps, not just tighter ones.
What pressure range is typically recommended for PVA wood glue?+
Manufacturers commonly recommend roughly 100-150 psi for softwoods and up to 175-250 psi for hardwoods, since denser wood resists compression more and needs more force to achieve the same tight glue line.
What happens if I apply too much clamping pressure?+
Excessive pressure can squeeze out so much glue that the joint is starved, leaving too thin a glue line to bond properly, and can also crush softer woods' surface fibers, leaving visible clamp dents or a joint that's mechanically weaker than intended.
Why do I need more clamps for a wide panel glue-up than the pressure number alone suggests?+
Clamp force diminishes with distance from the clamp head, so a single clamp can't evenly pressurize a joint more than a few inches long. Spreading multiple clamps at regular intervals across a long edge is what actually achieves the calculated pressure everywhere along the joint, not just near each clamp.