Is this calculation correct

I am not sure if I am on the right track. For example: If I have an 85% solution in 1 drop, or 0.05ml and I want to dilute it to 4%To calculate the dilution(C1)(V1) = (C2)(V2), or 85% x 0.05ml = 4% x 1.06 mlSo, to create a 4% solution I have to add 1.06ml to the 0.05mlIs this correct?

The calculator shows the result of your calculation. Subtract the Stock volume from the Dilute volume to find the amount of water to combine with the stock solution. This calculation works if the stock solution's density remains the same when diluted. If it changes, then you need to add the density factor to both sides of the equation. Vol1 x Density1 x Conc%1 = Vol2 x Density2 x Conc%2