Work out clay quantity instantly with clear inputs, formula shown and shareable results.
Clay weight is piece volume times density times the number of pieces, with a wastage allowance for trimmings and failed throws. Throwing wastage of 20% is normal because centring consumes clay that never becomes a pot, and reclaim takes days to become usable again.
Clay weight
grams = piece volume x density x pieces x (1 + wastage)
grams = piece volume x density x pieces x (1 + wastage). Clay weight is piece volume times density times the number of pieces, with a wastage allowance for trimmings and failed throws.
Throwing wastage of 20% is normal because centring consumes clay that never becomes a pot, and reclaim takes days to become usable again.
Enter volume of one piece, number of pieces, clay density, trimming and wastage. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.