Short answer: About 10 fl oz (300 ml) of mixed epoxy for one ⅛" coat on a 12×12 in surface, about 11.5 fl oz with 15% for drips.
Math: length × width × thickness ÷ 1.805 = fl oz (1 fl oz = 1.805 in³). Change the numbers below for your piece.
| Size | ⅛" coat | +15% |
|---|---|---|
| 12×12 in | 10 fl oz | 11 fl oz (0.09 gal) |
| 12×24 in | 20 fl oz | 23 fl oz (0.18 gal) |
| 24×24 in | 40 fl oz | 46 fl oz (0.36 gal) |
| 24×48 in | 80 fl oz | 92 fl oz (0.72 gal) |
| 36×72 in | 180 fl oz | 206 fl oz (1.61 gal) |
| 4×8 ft | 319 fl oz | 367 fl oz (2.87 gal) |
About 10 fl oz (300 ml) of mixed epoxy for one ⅛" coat on a 12×12 in surface, about 11.5 fl oz with 15% for drips.
Most tabletop epoxies self-level at about ⅛ in per coat. For more depth, pour a second coat after the first is tack-free.
On bare wood, yes: a thin scraped-on seal coat (about 1/32 in) stops air bubbles rising from the grain. Our tabletop coating calculator adds it.
More tools: resin calculator · tabletop coating · river table · deep pour · cure time · pour layers
As an Amazon Associate, ResinMath earns from qualifying purchases.