A wood glue calculator helps you determine exactly how long to keep clamps on a joint before the glue sets. Clamp time varies widely by glue type, shop temperature, wood density, and joint geometry. Getting it wrong means weak joints or wasted hours. Use this tool to calculate precise open time, clamp time, and full cure time for any glue-up scenario.
Calculate Glue Times
Wood Glue Reference Chart (at 70°F)
| Glue Type | Open Time | Clamp Time | Full Cure | Min Temp |
|---|---|---|---|---|
| PVA (Titebond Original) | 5-10 min | 30-60 min | 24 hrs | 55°F |
| PVA II (Titebond II) | 5-10 min | 30-60 min | 24 hrs | 55°F |
| PVA III (Titebond III) | 10-15 min | 45-60 min | 24 hrs | 47°F |
| Polyurethane (Gorilla) | 10-15 min | 1-2 hrs | 24 hrs | 40°F |
| Epoxy (5-min) | 3-5 min | 10-15 min | 1 hr | 50°F |
| Epoxy (30-min) | 20-30 min | 4-6 hrs | 24 hrs | 50°F |
| Hide Glue (liquid) | 5-10 min | 30-60 min | 24 hrs | 60°F |
| CA Glue (super glue) | 5-15 sec | 1-5 min | 24 hrs | 40°F |
Times are approximate manufacturer guidelines at 70°F for standard edge-grain joints in softwood. Actual times vary by brand, humidity, and application.
How to Use the Wood Glue Calculator
Removing clamps too early ruins joints. Leaving them on too long wastes shop time. This free wood glue calculator tells you exactly how long to clamp based on your specific conditions, so every glue-up reaches full strength without guesswork.
Step 1: Choose Your Glue Type
Select from eight common wood glues including PVA (Titebond Original, II, and III), polyurethane, 5-minute and 30-minute epoxy, liquid hide glue, and CA (super) glue. Each glue has different base open times, clamp times, and cure times from the manufacturer. The calculator uses these as starting points before applying adjustments.
Step 2: Enter Your Shop Temperature
Temperature is the single biggest factor affecting glue clamp time. Below 70°F, chemical reactions slow down and clamp time increases roughly 50% for every 15-degree drop. Above 70°F, glue sets faster. The calculator also warns you if your temperature falls below the glue's minimum threshold, where the glue may not cure properly at all.
Step 3: Select Wood Density
Dense hardwoods like oak, maple, and hickory absorb less moisture from the glue, which slows the curing process. The calculator adds 25% to clamp time for dense hardwoods. Softwoods like pine and cedar use the standard manufacturer time. Medium hardwoods like cherry and walnut fall in between.
Step 4: Choose Your Joint Type
End grain joints are the most demanding because the porous end grain wicks glue away from the surface. The calculator adds 50% extra clamp time and recommends applying two coats of glue. Large surface area glue-ups also need more time because the center of the panel takes longer to cure. Edge grain and face grain joints use standard timing.
Understanding the Results
The calculator shows three key times. Open time is your assembly window — how long you have to spread glue, align parts, and apply clamps before the glue starts to skin over. Clamp time is the minimum time under pressure for an adequate initial bond. Full cure is when the joint reaches maximum strength. Always wait for full cure before machining, sanding, or stressing the joint.
Pro Tips for Better Glue Joints
Do a dry fit before applying glue to ensure everything aligns properly. Spread glue evenly on both mating surfaces. Apply enough clamp pressure to see a thin, consistent squeeze-out line along the joint — too much squeeze-out means you are starving the joint. Wipe excess glue with a damp cloth before it skins over, or let it dry to a rubbery state and peel it off with a chisel.
Frequently Asked Questions
Is this wood glue calculator free?
Yes, the wood glue calculator is completely free with no limits, no signup, and no account required. Calculate clamp and cure times as many times as you need. All calculations run locally in your browser.
Is my data safe and private?
Absolutely. Everything runs entirely in your browser. Your glue selections, temperature settings, and project details are never sent to any server. No data ever leaves your device.
How long should I clamp wood glue?
Clamp time depends on glue type, temperature, and joint conditions. PVA glues like Titebond need 30-60 minutes at 70 degrees Fahrenheit, while polyurethane glues need 1-2 hours. Cold temperatures significantly increase clamp time. This calculator adjusts for all these factors.
Does temperature really affect wood glue cure time?
Yes, temperature is the single biggest factor. Below 70 degrees Fahrenheit, clamp time increases by roughly 50% for every 15-degree drop. Most wood glues have a minimum temperature threshold below which they will not cure properly. Always check the label for minimum application temperature.
Do I need to clamp longer for hardwoods like oak and maple?
Yes, dense hardwoods absorb less glue and take longer to develop a bond. Oak, maple, and other dense species typically need 25% more clamp time than softwoods like pine and cedar. The calculator adjusts automatically when you select a dense hardwood.
Why does end grain need more glue and longer clamping?
End grain is porous and wicks glue away from the joint surface, creating a starved joint. Most woodworkers apply a sizing coat first, let it soak in for a few minutes, then apply a second coat before assembly. The extra absorption means you need 50% more clamp time for a reliable bond.
What is the difference between clamp time and full cure time?
Clamp time is how long you need mechanical pressure on the joint. After that you can carefully remove clamps and do light handling. Full cure time is when the glue reaches maximum bond strength, typically 24 hours for most wood glues. Avoid stressing the joint until it is fully cured.
Which wood glue is best for outdoor projects?
Titebond III (PVA III) is waterproof and works down to 47 degrees Fahrenheit. Polyurethane glue like Gorilla Glue is also waterproof and fills gaps. Epoxy is the strongest choice for outdoor structural joints. Standard PVA (Titebond Original) and PVA II are not suitable for long-term outdoor exposure.