These descriptions are used to identify the strength or concentration of perfume oil in a fragrance. The concentrations can vary from fragrance to fragrance, but here is an average guide. In general, the higher the percentage, the higher the price. So, when you like a fragrance, we suggest you explore its different concentrations. Attar/ Perfume Oil – 100%. Perfume – 20-25 % Eau de Parfum (EDP) – 15-20% Eau de Toilette (EDT) – 8-15%. Eau de Cologne (EDC) – 2-8%