Epoxy Resin Calculator — How to Calculate Your Project

All epoxy volume calculations follow the same three-step process:

1. Calculate geometric volume — length × width × depth (or use the appropriate formula for your shape).
2. Apply a fill factor — accounts for void fill %, coat thickness, or inclusion ratio depending on project type.
3. Add a waste buffer — at minimum 10%, ideally 15% for first pours, to cover mixing container residue and drips.

The divisor 1.805 converts cubic inches to fluid ounces (1 fl oz = 1.805 cu in). For metric projects, multiply cubic centimeters directly by 1 to get milliliters — no conversion needed.

Each project type uses a different fill factor. Using the wrong mode will over- or under-estimate your resin needs significantly.

The calculator automatically applies the correct formula when you select your project type — you just need accurate measurements.

Epoxy is a two-part system: Part A (resin) and Part B (hardener). The ratio tells you how much of each to measure out from your total batch volume.

Always check your product's label or datasheet — the ratio is usually printed prominently. Off-ratio mixing is the most common cause of epoxy not curing properly.

1. Select your project type — River Table, Floor Coating, Mold/Casting, or Jewelry.
2. Enter your dimensions — measure twice. For river tables, measure only the void channel. For floors, measure the actual coverage area.
3. Set your mix ratio and unit system — match your product's specifications. Choose imperial (oz/in) or metric (mL/cm).
4. Enter kit size and price (optional) — the calculator will show how many kits you need and the total cost.

Click Calculate and you'll instantly see: total volume with waste buffer, Part A and Part B quantities, kit count, estimated weight, and total cost.