Free Tools

Free Pottery Calculators

Quick answers to the sums potters do all the time, like how much your clay will shrink and what a firing costs.

Free, no sign-up Metric and UK prices first Free to add to your own website

Calculators

Pick a Calculator

Each one opens on its own page, with notes on how it works and where the numbers come from.

Clay Shrinkage Calculator Work out what size to make a piece now so it comes out of the kiln the size you want, or where a piece will end up after firing. Open the calculator Kiln Firing Cost Calculator See what a bisque or glaze firing costs in electricity on your kiln, and what that adds to each piece you fire. Open the calculator Want One We Don't Have? Tell us which sum you'd like a hand with, and we'll look at adding a calculator for it. Get in touch
For teachers and studios

Put One on Your Website

Every calculator is free to add to your own website, class page or studio blog. Want the reasons behind the numbers? Our Learn Pottery guides explain shrinkage, firing and more.

  1. Open the calculator you want. Each one has its own page.
  2. Copy the code at the bottom of the page. The Copy code button puts it on your clipboard.
  3. Paste it into an HTML section on your site. The calculator appears there and works the same as on ours.