Volume for tables, molds, coasters, and coatings, split into part A and part B for your mix ratio, with waste margin and cost per pour. Measure once, pour once.
Live-edge channels vary in width. Measure the gap every 6 inches and use the average. Most makers add 10% for soak-in on raw wood.
Volume in cubic inches is length × width × depth. One US gallon of mixed epoxy fills 231 cubic inches, one fluid ounce fills 1.805 cubic inches. The calculator adds your waste margin, then divides the total by your mix ratio so you can measure part A and part B directly.
Follow the label. Most hobby epoxies specify ratios by volume, but part A and part B have different densities, so a 1:1 by-volume product is not 1:1 on a scale. Mixing at the wrong ratio is the most common cause of soft, sticky cures — and it cannot be fixed by adding more hardener afterward.
Epoxy cures exothermically, and thick pours trap that heat. Past the rated depth the center can exceed safe temperature, causing yellowing, cracks, or a violent flash cure. Deep-pour formulas cure slowly and cooler; table-top formulas do not.
Yes. Most resins want the workspace, the resin, and the mold at roughly 72–77°F. Cold resin is thick, holds bubbles, and may never fully cure; a warm water bath for the sealed bottles before mixing helps in winter.