To work out how much epoxy you need, multiply the length, width and depth of your pour in inches to get cubic inches, then divide by 1.805 for fluid ounces (divide again by 128 for gallons). The calculators below do that for rectangular and round pours, and convert the volume into the resin and hardener amounts to mix.

Before you start typing, settle one thing: the depth you enter is the depth you actually intend to pour, which is rarely the product's maximum. Getting that number wrong is the most common reason people over-buy, and the quick answers below explain how to pick it.

Before you calculate: quick answers

How much epoxy do I need?

Multiply the length, width and depth of your pour in inches to get the volume in cubic inches, then divide by 1.805 to convert that to U.S. fluid ounces. Divide fluid ounces by 128 for gallons. The rectangle calculator on this page does all three steps for you.

What depth should I enter?

Enter the depth you actually intend to pour, not the product's maximum. This is the single most common way people over-buy. Superclear Countertop Epoxy can be poured up to a quarter inch per pour, but it self-levels at roughly 1/32 to 1/16 of an inch, so entering a quarter inch can call for around four times the resin a self-leveled coat actually uses.

What is the maximum depth I can pour in one go?

It depends on the formulation. Liquid Glass Deep Pour 2:1 is a casting resin and pours 2 to 4 inches in a single application, depending on ambient temperature and total mass. The 24 Hour Liquid Glass Deep Pour 2:1 pours up to 1 inch per layer. Table Top Epoxy 1:1, Designer Art Resin 1:1 and Countertop Epoxy 2:1 are coatings and take up to a quarter inch per pour. Never treat a 1:1 coating as a deep-pour casting resin.

Should I mix a little extra?

Yes. Some material is always left behind on the sides of the bucket and on your mixing stick, and an uneven substrate will take slightly more than the arithmetic suggests. The weight ratio calculator on this page includes a fudge factor field for exactly that. Running short mid-pour is far more expensive than mixing a little extra.

Do I measure by volume or by weight?

Either works, as long as you stay exact. By volume, Liquid Glass Deep Pour, the 24 Hour Deep Pour and Countertop Epoxy are 2:1, while Table Top Epoxy and Designer Art Resin are 1:1. By weight the ratio is different for every formulation, because resin and hardener have different densities. Use the weight ratio calculator on this page rather than assuming the volume ratio carries over.

What if my project is not a rectangle?

Use the round project calculator, which takes the diameter. The formula is radius squared times pi times your pour depth, then divide the cubic inches by 1.805 for fluid ounces. For an irregular shape, break it into rectangles and circles, work each one out separately and add the results together.

Does the calculator tell me which kit size to buy?

No. It gives you the volume your pour needs, in cubic inches, fluid ounces and gallons. Match that figure to the kit sizes on the product page and round up to the next size. If you are between sizes or working on something unusual, call 888-849-0588 or email superclear@fgci.com and we will size it with you.