Calculate how much solute to add for any percent solution — weight/volume, volume/volume, or weight/weight.
Select the type of percent solution you need: %(w/v) for dissolving a solid in a liquid (most common in biology/chemistry labs), %(v/v) for mixing two liquids (e.g., ethanol in water), or %(w/w) for mass-based mixtures. Enter the desired percentage and final volume or mass, and the calculator tells you exactly what to measure.
% (w/v) = grams of solute per 100 mL of solution. A 10% (w/v) NaCl solution contains 10 g NaCl per 100 mL. To make 500 mL: 10/100 × 500 = 50 g NaCl, dissolved and brought to 500 mL with water.
% (v/v) = mL of solute per 100 mL of solution. A 70% (v/v) ethanol solution contains 70 mL ethanol per 100 mL. To make 1 L: 70/100 × 1000 = 700 mL ethanol + 300 mL water.
% (w/w) = grams of solute per 100 g of total solution. A 5% (w/w) sugar solution: 5 g sugar + 95 g water = 100 g solution.
Common lab solutions: 10% SDS (w/v), 70% ethanol (v/v), 10% APS (w/v, make fresh), 0.1% Tween-20 (v/v), 10% glycerol (v/v), 1% agarose (w/v).