Precision Pouring: Calculating Resin Volume
Epoxy and UV resins are expensive materials. Mixing too much resin leads to waste (as it cannot be saved once mixed), while mixing too little leaves you with a 'short pour' that can ruin a project by creating visible seams or bubbles when you try to add a second layer.
The Density Problem
Resin is almost always sold and mixed by volume (fl oz or ml), but its density is slightly higher than water. This calculator focuses on the geometric volume of the mold cavity to give you the most accurate starting point for your mix.
The Formula
We calculate the cubic inches of the mold and then convert those into the standard units of measurement used in resin crafting.
Volume (ml) = (Area * Depth) * 16.387
(Note: 1 Cubic Inch ≈ 16.387 ml or 0.554 fl oz).
Accounting for Displacement
If you are adding 'inclusions' (flowers, glitter, crystals, or wood) to your resin, those items will displace the liquid resin. A mold that holds 100ml of pure resin might only need 80ml if it is packed with large floral inclusions. Always estimate slightly under your calculated volume if you have a significant amount of inclusions.