Epoxy Resin Calculator — Free & Easy
Estimate the mixed resin needed for a rectangular tabletop or round mold, including extra waste, metric volume, fluid ounces, approximate weight and parts A/B by volume.
Loading the interactive calculator. Enable JavaScript to enter your values, or use the formulas and worked example below.
How to use the Epoxy Resin Calculator
Estimate the mixed resin needed for a rectangular tabletop or round mold, including extra waste, metric volume, fluid ounces, approximate weight and parts A/B by volume.
- Step 1. Measure the inside length/width or diameter and the actual fill depth.
- Step 2. Select inches or centimeters for all dimensions.
- Step 3. Apply a small extra allowance if needed for spills or losses.
- Step 4. Read the manufacturer’s specification to confirm the two-part mix ratio is by volume, then measure parts A and B accordingly.
Important: Product manufacturer guidance overrides the estimate, especially for mixing, safety and curing.
Epoxy Resin Calculator formula explained
Rectangular pour volume = length × width × depth. Circular pour volume = π × (diameter ÷ 2)² × depth. Convert inches³ to mL by multiplying by 16.387064. Include the extra percentage before dividing by the volume mixing ratio.
All calculator outputs depend on the measurements, units and assumptions you enter. Intermediate calculations use unrounded numeric values; formatted results may be rounded for easier reading. For any consequential purchasing or construction decision, verify supplier specifications and regulations.
Worked example with real numbers
A 12 × 8 × 0.125 inch pour occupies 12 cubic inches, or about 196.64 mL. With 10% extra you need approximately 216.31 mL of mixed resin; for a 2:1 volume ratio, that is about 144.21 mL part A and 72.10 mL part B.
The example illustrates the formula independently of the interactive fields. You can change the values above to match your own project and compare results.
Frequently asked questions
Is the resin calculator accurate for round molds?
It uses the cylinder formula for a perfect circular flat-bottomed mold. Tapered or irregular molds require volume adjustments or measured fill.
Is a 2:1 volume ratio equal to a 2:1 weight ratio?
Not necessarily. Part A and B may have different densities, so never substitute a weight ratio into volume-ratio inputs.
Does the tool account for maximum pour depth?
No. Follow your product’s cure schedule and safety limits; thermal reaction and pour thickness depend on chemistry.
How do I convert cubic inches to milliliters?
Multiply cubic inches by 16.387064. One milliliter equals one cubic centimeter.