Epoxy Calculator
How It Works
Epoxy resin projects require precise measurement of both resin and hardener components. Getting the ratio wrong can result in a sticky surface that never fully cures or a brittle finish. This calculator determines the exact amount needed for your project dimensions and adds a 10% waste factor.
Most tabletop epoxies use a 1:1 volume ratio (equal parts resin and hardener), while deep-pour and casting epoxies often use a 2:1 ratio (2 parts resin to 1 part hardener). Always check your product label for the correct mixing ratio.
For thin coatings (1/8 inch or less), tabletop epoxy is appropriate. For pours deeper than 1/4 inch, use a deep-pour casting resin that generates less heat during curing. Deep pours should be done in layers to prevent cracking from excessive exothermic heat.
Frequently Asked Questions
How much epoxy do I need per square foot?
For a thin seal coat (1/16 inch), you need about 4 fl oz per square foot. For a standard flood coat (1/8 inch), plan 8 fl oz per square foot. Always add 10% extra for waste and leveling.
What happens if I mix epoxy incorrectly?
Too much hardener can cause the epoxy to cure too fast, creating excessive heat and potential cracking. Too little hardener results in a permanently soft or tacky surface. Always measure precisely by volume or weight.
How deep can I pour epoxy in one layer?
Table-top epoxy: 1/8 to 1/4 inch per pour. Deep-pour casting resin: 1-2 inches per pour (some products allow up to 4 inches). Check manufacturer guidelines. Multiple thin layers prevent heat-related issues.
What is the working time for epoxy?
Working time (pot life) varies by product: fast-set epoxies have 15-30 minutes, standard tabletop epoxies 20-40 minutes, and deep-pour resins 40-80 minutes. Higher temperatures reduce working time significantly.