SPF Volume Calculator
SPF ratings are determined using an application thickness of 2.0 mg/cm². Applying less drastically reduces protection exponentially (e.g., applying half the amount of SPF 50 yields ~SPF 7, not SPF 25).
SPF ratings are determined using an application thickness of 2.0 mg/cm². Applying less drastically reduces protection exponentially (e.g., applying half the amount of SPF 50 yields ~SPF 7, not SPF 25).