Crafts
Epoxy resin calculator: how much resin do I need?
A flood coat takes about 4 fl oz of mixed epoxy per square foot (ArtResin): a 24 × 36 in tabletop needs about 26.4 fl oz with 10% extra. For molds and river tables, length × width × depth ÷ 1.805 gives fl oz.
How much epoxy to coat common sizes
One flood coat at ArtResin’s coverage of 4 fl oz of mixed resin per square foot, plus 10% for the cups and drips.
| Size | Area (sq ft) | Mixed epoxy (fl oz) | Smallest kit |
|---|---|---|---|
| 8 × 10 in | 0.6 | 2.4 | 8 fl oz |
| 11 × 14 in | 1.1 | 4.7 | 8 fl oz |
| 12 × 12 in | 1 | 4.4 | 8 fl oz |
| 16 × 20 in | 2.2 | 9.8 | 16 fl oz |
| 18 × 24 in | 3 | 13.2 | 16 fl oz |
| 24 × 36 in | 6 | 26.4 | 32 fl oz |
| 24 × 48 in | 8 | 35.2 | 64 fl oz |
| 36 × 48 in | 12 | 52.8 | 64 fl oz |
| 30 × 60 in | 12.5 | 55 | 64 fl oz |
| 36 × 72 in | 18 | 79.2 | 128 fl oz |
Citing this? Link to https://toolkitcove.com/crafts/epoxy-resin-calculator/. Computed by our calculator. Free to reuse with a link (CC BY 4.0).
Epoxy per square foot by pour depth
For molds, river tables and anything held in by a dam or form, the resin fills a measured volume. One US gallon is 231 cubic inches, so 1 fl oz is 1.805 cubic inches.
| Depth | Fl oz per sq ft | Sq ft per gallon |
|---|---|---|
| 1/8 in | 10 | 12.8 |
| ¼ in | 19.9 | 6.4 |
| ½ in | 39.9 | 3.2 |
| ¾ in | 59.8 | 2.1 |
| 1 in | 79.8 | 1.6 |
| 1½ in | 119.7 | 1.1 |
| 2 in | 159.6 | 0.8 |
A 72 × 12 in river channel poured 1½ in deep takes about 789.9 fl oz (6.2 gallons) with 10% extra.
How to measure a mold
- Fill the mold with water to where the resin should stop.
- Pour the water into a measuring cup. That’s the fl oz of mixed resin you need.
- Dry the mold completely before pouring: water and epoxy don’t mix.
Or switch the calculator to Pour and enter the inside length, width and depth.
Questions
How much epoxy do I need for a 24 × 36 table?
About 26.4 fl oz of mixed epoxy for one flood coat, with 10% extra: 13.2 fl oz resin and 13.2 fl oz hardener for a 1:1 product. A 32 fl oz kit covers it.
How much does a gallon of epoxy cover?
As a flood coat at ArtResin’s rate of 4 fl oz per sq ft, a gallon of mixed resin (128 fl oz) coats about 32 sq ft. Poured into a form to a true 1/8 in depth, a gallon fills about 12.8 sq ft.
Why are coat and pour figures so different?
A flood coat spreads and self-levels into a thin layer, and makers publish coverage from their own tests. A dammed pour fills a measured volume, so it uses the geometry: 1/8 in deep over 1 sq ft is 10 fl oz. If your brand gives a coverage figure, type it into the calculator.
Do I measure epoxy by volume or by weight?
Follow the label. Many art and coating resins mix 1:1 by volume; many deep-pour and laminating resins mix 2:1 or 3:1. A ratio by weight isn’t the same as a ratio by volume, because resin and hardener have different densities.
Why add 10% extra?
Some resin stays in the cup and on the stir stick, and a little runs over the edges. Mixing a second small batch mid-pour risks a visible line, so it’s easier to mix slightly more than you need.
How deep can I pour epoxy in one go?
It depends on the product: the label gives a maximum pour depth. Pouring deeper than that can overheat, crack or yellow the resin, so split deep pours into layers and wait between them as the label says.
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