Work out percentage strength of preparation instantly with clear inputs, formula shown and shareable results.
Expresses a preparation's strength as percentage weight in volume, mg/mL and ratio strength, the three notations used on pharmacy labels.
Percentage strength
% w/v = grams of solute per 100 mL of preparation; mg/mL = % w/v x 10; ratio strength = 1 in (volume / mass)
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
Weight in volume uses grams per 100 mL of solution; weight in weight uses grams per 100 g of preparation, used for ointments.
Adrenaline and some antiseptics are traditionally labelled as ratio strengths such as 1 in 1000.