Epoxy Calculator
Estimate mixed epoxy volume, resin and hardener split, pour batches, working weight, and coverage for shop pours, clear coats, molds, and river-table voids.
⚙Project Presets
📏Epoxy Inputs
🧪Epoxy Estimate
⚒Current Epoxy Spec Grid
📊Epoxy System Reference
| Epoxy system | Typical mix | Max lift | Density | Common use |
|---|---|---|---|---|
| Tabletop coating epoxy | 1:1 by volume | 1/8 in | 9.2 lb/gal | Flood coats and bar tops |
| Deep pour casting epoxy | 2:1 by volume | 2 in | 9.1 lb/gal | River tables and thick molds |
| Fast set repair epoxy | 1:1 by volume | 1/4 in | 9.4 lb/gal | Small repairs and gap fills |
| Marine laminating epoxy | 5:1 by volume | 1/16 in | 9.5 lb/gal | Fiberglass cloth wet-out |
| Floor coating epoxy | 2:1 by volume | 1/16 in | 9.6 lb/gal | Thin roll-on shop floors |
📐Coverage and Thickness Reference
| Application | Target thickness | One gallon covers | Best waste factor | Batch note |
|---|---|---|---|---|
| Seal coat | 1/32 in | About 123 sq ft | 10% | Mix small batches |
| Flood coat | 1/8 in | About 30.8 sq ft | 10-15% | Pour quickly after mixing |
| Clear casting | 1 in | About 3.2 sq ft | 15% | Watch exotherm limits |
| River channel | 1-2 in | Depends on void area | 15-20% | Stage by max lift |
| Fiberglass wet-out | Thin film | Varies by cloth weight | 10% | Work within pot life |
🔬Mixing and Batch Reference
| Batch size | Good use | Heat risk | Mix time | Shop note |
|---|---|---|---|---|
| 8-16 fl oz | Seal coats and small molds | Low | 2-3 min | Scrape cup sides |
| 24-48 fl oz | Tabletop flood coats | Medium | 3-4 min | Pour into tray soon |
| 1/2-1 gal | Large surfaces | Medium-high | 4-5 min | Use wide mixing pail |
| 1-2 gal | Deep pour epoxy only | High | Per data sheet | Confirm max mass limit |
📋Common Project Size Reference
| Project | Typical dimensions | Fill percent | Suggested epoxy | Planning cue |
|---|---|---|---|---|
| Desk flood coat | 60 x 30 x 1/8 in | 100% | Tabletop 1:1 | One wide pour |
| River coffee table | 42 x 6 x 1.5 in | 100% | Deep pour 2:1 | Stage if over lift |
| Serving board cracks | 18 x 2 x 1/4 in | 30% | Fast set 1:1 | Tape underside |
| Round mold casting | 12 x 12 x 1 in | 79% | Deep pour 2:1 | Use mold volume |
| Fiberglass panel | 48 x 24 thin film | 100% | Marine 5:1 | Wet cloth evenly |
ℹShop Notes
Calculating the correct amount of epoxy resins is a necessary task due to the resin’s high cost and difficulty in usage if epoxy resin is found to run out during the pouring of epoxy resin. If epoxy resin run out before the project is complete, it is possible that a seam will be formed in the epoxy resin that ruins the epoxy resin project’s appearance. To avoid wasting epoxy resin and to ensure that there is enough epoxy resin to complete the project, you must calculate the volume of epoxy resin that will be needed for the project.
To calculate the volume of epoxy resin that will be needed, the length, width, and depth of the area that will be poured with epoxy resin must be consider. Many people often make the mistake of only calculating the area of the surface of an object, such as a table, but the epoxy resin fills three-dimensional space. You must pour the length, width, and depth of that space into a volume calculator to calculate the total amounts of epoxy resin that will be required.
How Much Epoxy Resin You Need
A small change in the depth of epoxy resin that is to be poured can have a large effect on the total amount of epoxy resin that must be purchased. It is also important to distinguish between a flood coat of epoxy resin and a gap fill with epoxy resin. For flood coat, the epoxy resin will fill the area of an object with resin, but for a gap fill, the epoxy resin will fill only a void within that object.
If you calculate the total dimensions of the object when only pouring epoxy resin into a gap, too much epoxy resin will be calculated. The average width of the gap should be measured to calculate the amount of epoxy resin for a gap fill project. Accurate calculations of the amount of epoxy resin that will be needed will prevent wasted money buying unnecessary amounts of epoxy resin.
Another factor that must be considered in the calculation of epoxy resin is the waste of epoxy resin. Because epoxy resin often sticks to the sides of the mixing bucket, the stirring stick, and the mold in which it will be poured, it is a recommendation to add a ten percent overage to the total volume of epoxy resin that will be calculated. Additionally, if the wood items that will be treated with epoxy resin are porous, some of the epoxy resin may be absorbed by the wood, requiring even more epoxy resin than calculated.
The mix ratio for epoxy resin is a chemical requirement for use epoxy resin. Part A and Part B epoxy resin must be mixed together in the specific ratio that is manufacturer recommended. If the ratio of Part A to Part B is not correct, the epoxy resin will not cure proper and will remain sticky.
A sticky epoxy resin will ruin any epoxy resin project. The other factor to consider is the maximum depth of epoxy resin, or the lift. When epoxy resin hardens, it releases the heat that is generated during the curing process.
If the maximum depth of epoxy resin are exceeded, the heat will cause the epoxy resin to crack, yellow, or even smoke. Reference tables for epoxy resin will indicate if the epoxy resin to be used is a coating resin or a casting resin. Coating resins has a smaller lift than casting resins.
If the depth of the project exceeds the lift of the epoxy resin, it will be necessary to pour epoxy resin in stages. Finally, the last factor to consider is the pot life of epoxy resin. The pot life of epoxy resin is the amount of time that epoxy resin should take to be poured into the project.
The higher the temperature at which epoxy resin is mixed, the more rapidly the chemical reaction between Part A and Part B of epoxy resin. Thus, the higher the temperature, the shorter the pot life. By mixing epoxy resin in smaller batches, you can manage the pot life of epoxy resin so that pouring of epoxy resin can be completed before the epoxy resin thickens.
