▶ Stop guessing how much epoxy to mix. Resin Calculator turns your mold size into the exact resin volume you need, then splits it into the right A and B amounts for a clean cure. ▶ Pick a shape — rectangle, cylinder, ring, sphere or a custom volume — enter the dimensions, and get the total in milliliters or ounces, with an adjustable waste margin so you always mix a little extra. ▶ Split by ratio your way: 1:1, 2:1, 3:1 or a custom ratio, measured by volume or by weight. Set a specific gravity for resin and hardener so the weight split is honest, not just a rough guess. ▶ Deep pours build heat. When a layer is thicker than your safe limit, the app flags it and suggests how many pours to break it into. Always follow your resin maker's own depth and safety guidance. ▶ Save projects with notes, reuse coaster, tray and river-table presets, and share a clean result card. Works offline, no account needed. Results are estimates based on your inputs; real usage varies with mold shape, temperature and technique. This app does not provide safety or chemical advice — always read your product's instructions.