Free epoxy volume calculator: enter length, width, and depth in inches or cm to see how much resin to pour in ounces, gallons, or liters, with waste and cost.
Resin Coaster Calculator
Enter the inside dimensions and number of identical coaster molds. Compare the raw batch volume, waste allowance and complete kits to buy, with small quantities shown in mL.
Enter your measurements
Example inputs
Default dimensions, allowances and prices are example inputs. Replace them with your measurements and product label. Leave unknown product limits blank.
Coaster resin estimate
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Start with the inputs to generate an order-ready estimate.
- Raw volume
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- Conservative
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- Projected cost
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- Part A / Part B
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- Layer guidance
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- Kits to buy
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- Standard
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- Product fit
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Why This Estimate Changed
What moved the number
- Enter the form values to see raw volume, buffer, and recommendation.
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.
Measurement diagram
How much resin does a coaster need?
A 4 in round coaster poured 1/4 in thick needs about 51 ml (1.7 fl oz) of resin, and a set of four about 206 ml (7 fl oz) before waste. Resin scales directly with thickness, so a 1/8 in pour needs half as much. The table adds the calculator's default 8% for cup loss and drips.
| Coaster | Thickness | One coaster | Set of 4 + 8% |
|---|---|---|---|
| 4 in round | 1/8 in | 26 ml (0.87 fl oz) | 111 ml (3.8 fl oz) |
| 4 in round | 1/4 in | 51 ml (1.7 fl oz) | 222 ml (7.5 fl oz) |
| 4 in square | 1/4 in | 66 ml (2.2 fl oz) | 283 ml (9.6 fl oz) |
| 10 cm round | 5 mm | 39 ml (1.3 fl oz) | 170 ml (5.7 fl oz) |
| 10 cm square | 5 mm | 50 ml (1.7 fl oz) | 216 ml (7.3 fl oz) |
A six-piece coaster batch
One theoretical round coaster 4 in in diameter and 1/4 in deep holds π × 2² × 0.25 = 3.1416 in³, or 51.48 mL. Six identical coasters need 308.89 mL raw and 333.60 mL with 8% waste. Square mode uses the actual inside length and width. Curved rims, raised details and inserts change the cavity: use known mold capacity when geometry is not a good match. The calculator reports the batch in mL so a small purchase is not hidden by gallon rounding.
Product data before mixing
Use the exact product documentation for mixing basis, maximum layer depth, mixed batch volume and cure or recoat conditions. A dimensional estimate and a purchase allowance do not supply those material limits.
What this calculator covers
- Round or square/rectangular inside dimensions.
- Piece count, raw batch quantity and waste-adjusted purchase amount in mL.
- Confirmed product ratio and whole-kit mixed yield can be entered separately.
How to measure or set the inputs
- Choose inside geometry for a regular shape, or use a known cavity capacity where that mode is available.
- Set the number of identical pieces; the main quantity is the total batch, with a separate loss allowance.
- Check the raw quantity against a hand calculation or a product's published mixed capacity.
- Enter product ratio, limits and total kit mixed yield only when confirmed; purchase quantity is not a batch-mixing instruction.
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?
Yes. Enter the number of identical coasters. Raw and recommended quantities already include that count, so do not multiply the batch result again.
Can I calculate square coasters?
Yes. Choose Square / rectangle and enter inside length, width and depth. Irregular cavities can use the mold calculator's known-capacity mode.
Does this include every pigment cup or mold detail?
No. The geometric model does not measure raised details, inserts or extra cups. Use a suitable loss allowance or a known mixed cavity capacity for a more representative plan.
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Reviewed · Calculation notes and corrections