99% of Divers Don't Know These Basic Nitrox Formulas

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Nitrox certification is one of the most common classes divers take after their initial open-water training. With it, we learn about max operating depths for nitrox blends, but calculating the MOD is a bit tough. Yes, we know we can't exceed 1.4 PPo2, but how do we calculate the "best mix" of nitrox for a depth? How do we know the Max Operating Depth? How do we calculate the PPo2 at depth? In this video, I cover how any scuba diver can easily calculate these using a simple formula for nitrox calculations derived from Dalton's Triangle.

This video is NOT sponsored. Some product links are affiliate links, which means if you buy something, we'll receive a small commission.

⏰ Timecodes ⏰
0:00 Nitrox Calculations for Scuba Divers
1:48 Dalton's Triangle
2:57 How to Calculate Max Operating Depth (MOD)?
8:59 How to Calculate Partial Pressure of Oxygen (PPo2)?
12:31 How to Calculate "Best Mix" for Nitrox at a Depth?
17:05 Free Nitrox Calculator Online
17:34 How to Analyze a Nitrox Cylinder?

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At CircleHScuba, we share education and experiences you'll love to plan your next adventure. As a PADI Professional Scuba Instructor, I want to make you a better-informed scuba diver!

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*Disclaimer:* Circle H Scuba and Thomas Hughes believe you can not teach someone how to dive, nor certify them for diving, through the internet. Ensure you seek proper training through an instructor who is active and certified through a recognized agency, and always dive within the limits of your certification.

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[mathewdavis-adventuresandd]

Great video. I've got the course ready to start for nitrox... but, I wanted to watch a few videos before taking the course. Thank you for explaining this.

[SummersideDiver]

Nice breakdown on working through the Nitrox formulas. I truly believe that we all need to know how the math works and how to do the math for each dive/tank. Explanations like this help us all. Thanks

[chrisphilhower]

I am doing my Nitrox course. Just waiting for the Instructor for the Hands On. All they taught me was Atmospheres times O2 percentage. And said that the Computer would calculate the PO2. Hoping to at a Max of 1.4.

[yeetergriffin]

Future navy diver here,
Im studying for my Asvab, specifically Electronics information section. Same exact formula or Ohms law! Very convenient and cool. I will pass both nitrox and Asvab with flying colors.

[pillar]

So I have a question how do you keep the perfect seal with your mustache and beard because during my recreational dives, I kept having an issue where water would seep in through the bottom of my nose where my mustache is or goatee and I would have to use Vaseline to counter that is there something other than I can do?

[neogator]

Great job breaking down the math. Having been mathed in the head for years in engineering school I’ve seen plenty of bad breakdowns for formulas.

[spacewalktraveller]

Thanks for the video, much appreciated.

[josephdracula]

👍😎🇵🇭🤿! Good refreshing video! I feel that you have a great way of explaining this! Much better than my original certification. I know that you had a hard time compressing this in a short time! Great job

[benheckendorn]

I just did nitrox class a few months ago, but I learned: PP02 of 1.6 is max, for emergency or a short dive like, I had to pick up a gear I lost.


But 1.5 PP02 could be possible, so tell me if I'm wrong: If it's a single dive at this day to a wreck for example the PP02 of 1.44 would be still fine.
So, I would add this rule: PP02 1.4 if you plan more then one dive, PP02 1.5 would be possible for a single dive. 😯

[MaciejJeszkeP]

Most easy version for metric and you can do it in just line ...
(14/Nitrox)-10=Max_Depth

For 40% Nitrox
(14/0, 40)-10=25 m

[thorreijs]

When i was doing my NitrOx course i flipped this formula around to make it more easy....

You can say
PpO2*100/%O2 = depth-10

Assume that your ppO2 is a constant of 1, 4 for conservative reasons, you get 1400 and the math will be easy.

The value of your O2 is in percentage. Saves a lot of calculation errors😉

[mojo]

My brain hurts after watching this but I must say you explained it very well and everyone should know this diving nitrox or not . Thanks .

[addohm]

Its not specifically for nitrox. It (dalton's T) also applies to using helium when planning tech dives.

[Nanookh]

Teach students to go metric all the way. Makes quick calculations under water (e.g. in case of lost gas and replacement is offered) a lot easier than introduce that 33 in the equations. You're using the (metric) ATA anyway.

[EnergiZeScuba]

When is the imperal unit system better than metric? 😅🤷🏻‍♂️

[DearhRATTLE]

I think I'll never be able to dive mix gas or rebreather I feel like it's way to advance for me and above my math skills

[Mr_D]

TMI, just buy a dive computer. You did explain it very well though.

[ODZamir]

Use 1.6. PP and 32% is 40 m and 1.6 PP and 36% is 34.4 or 34 m.

[jonnieinbangkok]

Unless you're tech diving with custom gas blends, there's no reason to know any formulas when using Nitrox. At least in Asia, where I dive, for recreational dives, all you'll get are EAN32 or EAN36; and all one needs to know are the 33m and 29m MODs respectively.

[ee]

I think if you need formulas or some memory helpers, you didn't understand how things work. When you do you will not need to memorize stuff, everything is obvious.