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Resin Casting Volume Calculator

Work out a mould's volume from its shape or by the water-weight method, then split it into resin and hardener — with the crucial by-volume / by-weight ratio toggle.

Related tools

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Beading Pattern CalculatorTotal beads and finished size for a loom or peyote pattern from rows, columns and bead size.Candle Wax CalculatorTurn a container's volume into the wax weight and fragrance oil you actually need, for soy, paraffin, coconut, beeswax, palm or a blend — in oz, grams and pounds.Crochet Hook Size ConverterConvert crochet hook sizes between metric (mm), US and UK, with a full reference table.Cross-Stitch Floss CalculatorEstimate how many skeins of floss a design needs from stitch count, strands and fabric count.Cross-Stitch Size CalculatorFinished design size from stitch count and fabric count, in inches and cm, with an optional margin.Embroidery Thread Length CalculatorEstimate embroidery thread length from stitch count, average stitch length and a waste allowance.Fabric Yardage CalculatorHow much fabric to cut a number of pieces from a bolt of a given width — in meters and yards.Knitting Needle Size ConverterConvert knitting needle sizes between metric (mm), US and UK, with a full reference table.

Resin Casting Volume Calculator is free to use as often as you like, directly from this page. It sits under Crafts & making in our catalogue, alongside Beading Pattern Calculator and Candle Wax Calculator.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Resin Casting Volume Calculator do?

Work out a mould's volume from its shape or by the water-weight method, then split it into resin and hardener — with the crucial by-volume / by-weight ratio toggle.

When would I actually use this?

Buying the right amount before starting: how many skeins a jumper needs, how much wax fills the moulds you own, how much resin a bezel takes, how much fabric a quilt binding eats.

What is the most common mistake?

Sizing from the pattern's yarn rather than your own. Two yarns sold as the same weight can differ by a fifth in metres per hundred grams, and a hook or needle size converted between systems is a nominal diameter, not a promise about gauge — knit a swatch.

Is there a tool for the next step?

Candle Wax Calculator is the closest one after this: Turn a container's volume into the wax weight and fragrance oil you actually need, for soy, paraffin, coconut, beeswax, palm or a blend — in oz, grams and pounds.

What else is worth having open alongside it?

Crochet Hook Size Converter and Cross-Stitch Floss Calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

Hook and needle equivalences follow the Craft Yarn Council's metric table; the soap calculator uses published saponification values, which vary by oil batch, so the lye figure is a starting point that a superfat margin is meant to absorb.

Further reading

All guides →
ExplainerEvery Oil Blend Has Its Own Lye RequirementA thousand grams of olive oil needs 127 g of lye; the same thousand grams of a palm-coconut-olive blend needs 143. Saponification is stoichiometry, not a rule of thumb, and a five per cent error in one direction makes a caustic bar.How-toBinding a Quilt: Strips, Bias and the Fabric to BuyA 150 × 200 cm quilt has a 725 cm perimeter once you allow for the join, which is seven strips off a 110 cm bolt and six off a 140 cm one. The strip width you choose sets the fabric, and the corners set whether it lies flat.ExplainerFabric Yardage Is a Staircase, Not a SlopeTwelve pieces of 46 cm take 1.84 m on a 140 cm bolt. Make them 47 cm and it jumps to 2.82 m — fifty-three per cent more fabric for one centimetre, because the third piece no longer fits across.How-toEstimating Embroidery Thread From a Stitch CountThirty thousand stitches at 3.5 mm with fifteen per cent waste is 120.7 metres. The stitch count comes from the file; the average length is an assumption, and doubling it doubles the answer.How-toCast On From Your Gauge, Not From the PatternTwo stitches per 10 cm is the difference between a 50 cm scarf and a 55 cm one. The pattern's cast-on number is only correct for the person who wrote it.ComparisonUS 8, UK 6, 5 mm: Three Needle Scales That Never AgreeThe American numbers count up as the needle gets fatter and the British ones count down. They cross exactly once, at 4.5 mm, where both read 7 — and that single coincidence is the trap.