Epoxy Calculator is a free Android app with ads for planning epoxy pours before mixing. Start by entering the dimensions and depth of a rectangular, circular or custom area, then select measurement units and set an allowance for material waste. The calculator estimates the amount needed for the pour and separates planned resin and hardener quantities according to a mixing ratio you choose by weight or volume. Use the ratio and measurement basis stated in your resin manufacturer’s instructions; grams and millilitres are not interchangeable. You can also review estimated material cost based on the values entered. Save a plan in the editable project journal, including its quantities and estimated cost, and use the cure timer to keep track of curing time. Inputs and results can be changed and recalculated; the displayed figures are estimates for planning. Project records remain on your device unless you choose to export or share them. Use the journal to revisit a project plan while organizing your work.