This pottery note contains dimensions for making some common functional items. It includes suggested starting weights for clay.
This is mostly for wheel-thrown pots but could be useful for hand-building too.
Remember there is extra clay for timing and turning foot-rings etc. Use these as a starting point and adjust as you go.
Remember to calculate shrinkage (wet to fired). You can find information about the shrinkage of a particular clay by visiting the clay supplier’s website – sometimes it’s even on the pack. Once you have the shrinkage rate, use the calculators you can find here: