Raw volume
--Craft Batch
Resin Coaster Calculator
Coasters are small enough that cup loss and batching matter. This calculator estimates one round coaster cleanly, then explains how to multiply the result for a set without ignoring craft waste.
Calculator
Plan the project in one pass
Coaster resin estimate
--
Start with the inputs to generate an order-ready estimate.
Part A / Part B
--Projected cost
--Layer guidance
--Why This Estimate Changed
What moved the number
- Enter the form values to see raw volume, buffer, and recommendation.
Compare Scenarios
Single coaster vs craft batch buffer
Standard
--Conservative
--Product fit
--Next Step
Match the result to the right resin class
Use the estimate to narrow the resin class first. Then confirm product limits, cure behavior, and measurement assumptions before you make a buying decision.
Why this page exists
- Designed for round coaster molds and small craft batches.
- Uses diameter and depth instead of rectangular inputs.
- Makes waste and cup loss more visible for small pours.
- Links to pricing and mold pages for craft sellers.
How to measure or set the inputs
- Measure the inside diameter of one coaster mold.
- Enter the final fill depth for one coaster.
- Calculate one coaster first, then multiply by the number in the batch.
- Raise the waste buffer for pigments, glitter, split colors, or many tiny cups.
Common mistakes that cost money
- Calculating the whole coaster set as one large pour.
- Ignoring color split cups and leftover resin in mixing containers.
- Entering the outside mold diameter.
Project checklist before you buy
- Confirm the mold or surface is sealed before mixing resin.
- Measure depth twice at the deepest point of the project.
- Add extra material for waste, seepage, and edge soak-in.
- Confirm the resin type matches the intended pour depth.
- Prepare cups, stir sticks, gloves, and a level work surface.
FAQ
Questions people ask before buying epoxy
Does this calculate a full coaster set?
The form calculates one coaster. Multiply the recommended amount by the number of coasters, then keep the waste buffer for batching.
Should pigments change the estimate?
Pigments usually do not change volume much, but multi-color work increases cup loss and process waste.
Can square coasters use this page?
Use the rectangle or cube-style page for square coasters because the geometry is different.
How accurate is this epoxy calculator?
It is designed for planning and procurement, not for replacing the manufacturer data sheet. The calculator is most useful when you add the right waste buffer and choose the page that matches your project type.
Why does the recommended amount exceed the raw volume?
Real projects lose material to mixing cups, edge soak-in, seepage, and safety margin. Raw volume alone is often too optimistic.
Should I still check the resin brand instructions?
Yes. Always confirm maximum pour depth, cure conditions, and mix ratio with the product documentation you plan to buy.
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