Tumbler Epoxy Calculator
Choose your tumbler size or enter its height and width, then pick the coat thickness and number of coats. You get how much epoxy to mix for each coat, with extra for drips.
Mix per coat
– fl oz
– ml per coat
| Resin (1:1) | – |
| Hardener (1:1) | – |
| All coats, all tumblers | – |
| Surface | – |
Most tumbler epoxies are 1:1 by volume. Check your label.
Next steps
Work out the cost of each tumblerPrice your tumblers with Etsy feesEpoxy per coat for common tumblersHow to use this calculator
- Pick a common tumbler size, or measure the height you will coat and the average width of your cup.
- Choose the coat thickness and how many coats you plan.
- Mix one coat at a time; the next coat goes on after the first has set as your label says.
How the calculation works
- Surface = 3.1416 × average diameter × height
- Epoxy per coat = surface × coat thickness × (1 + drip %)
- 1 fl oz ≈ 1.805 cubic inches
These are estimates. Glitter, decals and how fast you turn the cup all change how much stays on.
Epoxy per coat for common tumblers
Approximate sizes, standard 1/32 inch coat, 25% extra for drips:
| Tumbler | fl oz per coat | ml per coat |
|---|---|---|
| 20 oz skinny (about 8 × 2.9 in) | 1.6 | 47 |
| 30 oz (about 7 × 3.6 in) | 1.7 | 51 |
| 40 oz with handle (about 8.5 × 3.6 in) | 2.1 | 62 |
Tips for tumbler coats
- Tape the top rim and the bottom so the edges stay clean.
- Spread epoxy with a gloved finger or a soft brush while the cup turns slowly.
- Keep the cup turning until the epoxy stops moving, often several hours.
- Sand lightly between coats if the first coat has fully hardened.
Frequently asked questions
How much epoxy do I need for a 20 oz tumbler?
About 1.6 fl oz (47 ml) of mixed epoxy per coat for a 20 oz skinny tumbler, with a coat about 1/32 inch thick and 25% extra for drips. Measure your own cup, because sizes vary by brand.
How much epoxy for a 30 oz or 40 oz tumbler?
Roughly 1.7 fl oz per coat for a 30 oz tumbler and 2.1 fl oz for a 40 oz tumbler with a handle, on the same assumptions.
How many coats of epoxy does a tumbler need?
Many makers use two coats: a first coat to lock in glitter or decals, and a second, smoother top coat. Heavy glitter can need a third coat to cover the texture.
Why mix more epoxy than the tumbler holds?
Epoxy runs off the cup while it turns, and some stays in the mixing cup and on gloves. Mixing a little extra means you do not run short halfway around the cup.