Free pottery calculators.
The same materials engine that powers Claybench's production planner, free to use. No account needed.
Clay weight calculator
How much clay for 50 mugs? Pick a form, set quantity and trim waste, get pounds and bags.
Shrinkage calculator
Work backwards from a fired size to a throwing size — or forwards — for any clay body.
Cone chart & converter
Every Orton cone in °F and °C at both heating rates, and a temperature ↔ cone converter.
Drying time estimator
Wet to leather-hard to bone-dry, from wall thickness, clay body, and studio humidity.
Glaze materials reference
What each material does, how much potters use, at which cones — computed over ten thousand recipes.
Clay bodies compared
Published shrinkage, absorption and cone for 170+ commercial bodies — and what that means at the wheel.
Defects: causes and fixes
Crazing, crawling, pinholing, S-cracks and sixteen more — what they look like, why, and what to change.
Glaze types
Celadon, tenmoku, shino, ash, copper red… — cone, atmosphere, defining materials and typical chemistry, computed across ten thousand recipes.
Claybench runs these numbers for every piece automatically.
Plan a production run and the clay math, drying windows, and kiln schedule come with it.