How many grams of wax your containers need.
1296–1377 g of wax
216–229.5 g per container, at 300 ml each.
Assumes wax fills 80–85% of the stated container volume, leaving headroom for the wick tab and safe burning. Wax densities are approximations — check your supplier's technical data sheet, and allow a little extra for wax left in the melting pot.
Enter the volume of your container in millilitres (ml) or, if you prefer, its diameter and height in centimetres. Make sure to measure accurately as this will affect the calculation.