From wedging table to fired dimensions

Clay Calculators for Shrinkage, Weight & Drying

Clay changes twice before a pot is finished: it loses water while drying, then densifies again in the kiln. The useful number is not a generic percentage from a bag label, but the value measured from your own clay, forming method and firing schedule.

These tools cover the practical chain from a wet test bar to a finished piece. Start with the shrinkage calculator if you have measurements; use the target-size tool when you know the fired dimension you need; use the weight and inventory tools when planning a batch of work.

14 working tools

Choose a calculator

01 Clay Shrinkage Calculator Calculate drying, firing, and total shrinkage rates from wet, dry, and fired measurements. 02 Target Finished Size Calculator Calculate the wet throwing size needed to achieve a specific finished fired dimension. 03 Clay Weight Estimator Estimate the correct amount of wet clay needed for a pot based on dimensions and form type. 04 Drying Time Predictor Estimate how long a ceramic piece will take to dry based on wall thickness, humidity, and airflow. 05 Crack Risk Calculator Assess the cracking risk of a ceramic piece during drying based on form, clay type, and conditions. 06 Multi-Axis Shrinkage Calculator Measure shrinkage in X, Y, and Z axes to detect anisotropic behavior and warping risk. 07 Clay Water Requirement Calculator Calculate how much water to add to dry clay powder to reach a workable consistency. 08 Slab Size & Weight Calculator Calculate the wet cutting dimensions and clay weight for a slab with a target fired size. 09 Clay Body Blend Calculator Blend two clay bodies by percentage and predict the shrinkage and absorption of the resulting mix. 10 Grog Addition Calculator Calculate how much grog to add to reduce clay body shrinkage to a target percentage. 11 Clay Moisture Content Calculator Measure clay moisture percentage from wet and dry weights, or calculate how much water to add or remove to reach a target working consistency. 12 Wheel Throwing Weight Calculator Calculate how much wet clay you need to throw a cylinder, mug, bowl, plate, or vase based on target dimensions and wall thickness. 13 Clay Inventory Calculator Calculate how many ceramic pieces you can make from your current clay stock, accounting for trimming waste, cracking losses, and kiln scrap. 14 Clay Reclaim Yield Calculator Estimate recovered dry solids, target working-clay mass and water adjustment from dry and wet studio scrap.