Jesmonite Calculator

Total Mix Weight (g):

Mold Capacity (g or ml):

Water Used to Measure Mold Capacity (g or ml):

Total Mix Weight: – g

Powder: – g

Water: – g

This calculator helps you find the correct amounts of powder and water for a water-based Jesmonite mix.

The Jesmonite ratio is 100g powder : 26.3g water. This equals approximately 79.18% powder and 20.82% water by total mix weight.

If you already know the total amount of material needed, enter it here in grams.

The calculator will break it down into powder and water.

Example: For a 250g mix, you'll need approximately:

If you already know the mold capacity or the total amount of Jesmonite mix required to fill the mold, enter it here.

The calculator will use this value as the total mix weight and calculate the required powder and water.

Example: If the mold capacity is 300g, the mixture should be approximately:

If you don't know how much Jesmonite is required for your mold, fill the mold completely with water and measure the amount of water required.

Enter the measured water value above. The calculator will multiply this value by 1.85 to estimate the total Jesmonite mix weight required.

Example: If the mold holds 300g or ml of water:

Note: This method provides an approximate amount. Complex shapes, such as pots or vases, may require a small amount of trial and error.