Easy Epoxy Calc

How much resin for 6 hexagon coasters?

Short answer

Six hexagon coasters 10 cm across the flats and 8 mm deep need about 457 milliliters of mixed resin, including 10% extra — 69.3 milliliters per coaster, or about 72.7 g each on a scale.

How to work it out

  1. 0.866 × (10 cm)² × 8 mm = 69 cm³ = 69.3 ml each (≈ 72.7 g on a kitchen scale)
  2. × 6 + 10% = 457 ml (≈ 480 g on a scale)
  3. Mix ratio 1 : 1 by volume, SG A 1.15 / B 0.95 (typical, not published by the maker — type your data sheet’s SGs for exact weights) → Part A 229 ml (263 g) + Part B 229 ml (217 g)

Hexagon molds are measured flat-to-flat. A regular hexagon covers about 87% of the area of a square the same width, while a circle covers about 79% — so a 10 cm hexagon holds roughly 10% more resin than a 10 cm round coaster of the same depth.

Adjust for your project

cm
Inside of the mold: diameter, side, or for a hexagon the distance across the flats (flat edge to flat edge, not corner to corner)
mm
ml
Total of both bottles together, e.g. a 1,000 ml kit = 500 ml + 500 ml.
More options: waste · ratio · SG A …
%
Cup residue and overfill
Only changes the Part A / Part B split — it’s printed on the kit. Tabletop and art resins are usually 1:1; deep pour often 2:1.
From the TDS, in g/ml. Leave blank for 1.15 (typical, not published by the maker).
From the TDS, in g/ml. Leave blank for 0.95 on 1:1 kits or 0.97 on other ratios (typical, not published by the maker).
Casting resin to buy (whole set)457 ml15.5 fl oz
Per coaster (no waste)
69.3 ml (2.34 fl oz)
Per coaster on a kitchen scale (pour to this)
72.7 g
Whole set by weight, incl. waste (kitchen scale)
480 g
Kits to buy
1 kit
When mixing — Part A (resin)
229 ml (7.73 fl oz)
When mixing — Part B (hardener)
229 ml (7.73 fl oz)
Part A by weight
263 g (9.27 oz)
Part B by weight
217 g (7.66 oz)
Left over from the last kit
42.7 ml (1.45 fl oz)
  • What to buy: 1 × 500 ml casting resin kit. Each kit has both bottles (resin + hardener) — you don’t buy them separately. Looking at a different kit size? Change Kit size above.
  • Tight fit: only 42.7 ml spare. Resin left in the cup and on the stir stick can use that up — buy one more kit if you’re adding pigment or want a test pour.
  • At this depth, use a casting resin whose label covers it — coating (art) resins are made to go on only about 1/8 in (3 mm) per layer.

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Casting resin for molds & coastersAt 8 mm deep, use a casting resin rated for at least that depth, so each mold fills in one pour — check the label’s minimum and maximum depth. 1 × 500 ml kit covers the 457 ml, but only just — see the tight-fit note above.
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Resin by shape (six 10 cm coasters at 8 mm)

Resin by shape (six 10 cm coasters at 8 mm)
ShapePer coaster (no waste)Casting resin to buy (whole set)Kits to buy
Round62.8 ml415 ml1 kit
Hexagon69.3 ml457 ml1 kit
Square80 ml528 ml2 kits

What to know about 6 hexagon coasters

Check which way your mold is measured. A hexagon that is 10 cm across the flats is about 11.5 cm from corner to corner. If the listing says 10 cm and that turns out to be corner to corner, the flats are about 8.66 cm and the set needs only about 343 ml (see below). Entering a corner-to-corner figure as if it were the flats is the most common way to over-mix for hexagons.

A 500 ml kit covers this set with about 43 ml spare — enough for the cup residue, not for a seventh coaster. Hexagon sets are often poured with a matching honeycomb tray or holder; if you’re pouring one, work out its resin separately in the resin mold calculator and add it to the order before you buy.

At 8 mm, these are deeper than the roughly 3 mm a coating resin like ArtResin levels to in one layer, so either use a casting resin rated for the depth or pour in layers and let each one thicken to a soft gel before the next. Each coaster takes about 72.7 g by weight, which is the number to pour to on a scale. Hexagons tile edge to edge, so a small mismatch in thickness shows when the set is laid out together — pour all six from one batch.

For round or square sets, see how much resin for 4 coasters and how much resin for 6 square coasters.

Different size? Use the full Coaster Resin Calculator.

What you’ll need

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Frequently asked questions

What if my hexagon coaster mold measures 10 cm corner to corner?

Then the flats are about 8.66 cm and six coasters at 8 mm deep need about 343 milliliters with 10% extra — 52 ml per coaster.

How much resin for 6 hexagon coasters 10 mm thick?

About 572 milliliters with 10% extra — 86.6 ml per coaster, which takes 2 kits of 500 ml.

Other common sizes

Sources