Enter the assay on the as-is basis and the water percentage into the calculator to determine the anhydrous basis.
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Anhydrous Basis Formula
The following equation is used to calculate the Anhydrous Basis.
AB = (AOB*100)/(100-PW)
- Where Ab is the Anhydrous Basis
- AOB is the assay on as-is basis
- W is the percentage of water (%)
How to Calculate Anhydrous Basis?
Example Problem:
The following example outlines the steps and information needed to calculate Anhydrous Basis.
First, determine the assay on as-is basis. In this case, this value is found to be .56.
Next, determine the water percentage. This is measured to be 50%.
Finally, calculate the Anhydrous Basis using the formula above:
AB = (AOB*100)/(100-%W)
AB = (.56*100)/(100-50)
AB = 1.12