How to calculate how much Jesmonite you require: 

1. Add your silicone mould to your scales
2. Pour water into your silicone mould, until its filled
3. The measurement on the scales, times by 2
4. Add the new measurement into the calculator under Requirements (grams)
5. You will then have the total amounts you need to measure out.

EXAMPLE: Water weight = 175g x 2 = 350g
350g Jesmonite = 250g Powder + 100g Liquid