Simple to use Nitrox calculator which can determine your maximum operating depth (using PO2 of 1.4) and your contingency operating depth (using PO2 of 1.6) for a given Nitrox blend (FO2). Has the ability to pick "best mix" for a given expected maximum depth and once a blend has been chosen can calculate the equivalent air depth and PO2 exposure for a given depth. Added the ability to pick a start mix and a final mix and calculate the blending (ideal gases only) using pure O2 partial pressure blending with air top-up from any mix to mix from air up to 99.9% FO2. Ad free forever.