Practilia
DIY calculator

Epoxy Resin Calculator

Estimate mixed epoxy, resin and hardener parts, kits to buy, and layer batches for molds, coatings, and pours.

Unit system

Example values loaded. Do not buy from this example; replace shape, depth, ratio, kit size, and layer limit with your product and project details.

Project
Dimensions

Measure the inside area that will actually receive resin.

in
in

Use the planned pour thickness, not the finished object height.

in
Mix and purchase
%

Use the total mixed kit size, not only the resin bottle.

fl oz (US)

Enter A and B as separate numbers, or type a full label ratio like 1:1 or 2:1.

Use the product's maximum pour depth or your planned safe batch depth.

in

Inputs

Project use
Coating or flood coat
Shape
Rectangle
Quantity
1
Depth / thickness
0.15 in
Waste margin
10%
Resin part
1:1
Kit size
32 fl oz (US)

How to interpret the result

Use the mixed total to buy the kit and the resin/hardener split to measure the batch. The layer line is a batching cue: if project depth is above the product limit, pour smaller layers according to the label, pot life, and temperature.

Common mistakes

  • Using a 1:1 ratio when the product specifies 2:1, 3:1, or a weight-based ratio.
  • Mixing the whole project volume at once instead of checking pot life and maximum layer depth.
  • Ignoring leaks, wood absorption, bubbles, uneven surfaces, and material left in the cup.

How to calculate epoxy resin

Formula: base volume = measured shape x depth x quantity. Total mixed epoxy = base volume x (1 + waste margin / 100). Resin part = total x A / (A + B); hardener part = total x B / (A + B). Kits = ceiling(total / kit size). Use centimeters, millimeters, and milliliters in metric mode, or inches and US fluid ounces in US mode.

Example

Reference example: in US units, a 24 x 12 in rectangle at 0.15 in depth with 10% waste needs about 779 ml, or 26.3 fl oz (US), of mixed epoxy. With a 1:1 ratio, that is about 389 ml resin and 389 ml hardener. With a 32 fl oz kit, buy 1 kit. In metric mode, a 60 x 30 cm piece at 6 mm depth with 10% waste needs 1,188 ml, or 1.19 L; with a 1 L kit, buy 2 kits.

Assumptions

This is a volume estimate for flat surfaces, molds, and known-volume projects. Use the product label or SDS/TDS for mix ratio, maximum layer depth, pot life, temperature range, ventilation, PPE, and cure limits.

Review

Last reviewed: 6/25/2026

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