Free tools

Simple calculators, no account and no ads. They run entirely in your browser — nothing you type is sent anywhere.

• SPF protection time calculatorHow long sun protection lasts given your phototype, the UV index, the SPF and how much you applied.
• Cost per use calculatorWhat a skincare product actually costs per application, per month and per year, and how long it lasts.
• Cosmetics expiry calculatorWhen an opened product expires, based on the PAO symbol on the packaging and the date you opened it.