This calculator can be used for making a batch with the desired concentration of active ingredient or component, for adjusting the active ingredient concentration of a batch, and for mixing batches with known concentration of active ingredient. Please enter any four values and leave the values to be calculated blank. Check out the examples page for examples on the use of this calculator. When referring to the concentration of a batch that does not contain the active ingredient use zero (usually used in chemical dilution). For a batch that is all active ingredient use one hundred for concentration of active ingredient (usually used in chemical adjustment).