Photo by U.S. Navy — Navy Diver 2nd Class Brian Williams · Public domain (work of the U.S. federal government)
Nitrox Gas Blending
Foundational gas-blending course for safely mixing nitrox (up to 40% oxygen) using partial-pressure blending methods. Surface/classroom-based technical skills course (not in-water diving certification) for shop staff, fill-station operators, or divers who want to blend their own nitrox independently. Teaches oxygen-handling safety procedures critical when working with enriched air under pressure. Entry point into TDI's blending track; passing this is prerequisite for Advanced Gas Blending (trimix and custom mixtures). No dive certification prerequisite required since it addresses gas handling rather than diving.
Centres that teach this course
7 dive centres in the directory publish a price for this exact certification, checked Sep 2026. Each centre's own wording is shown beneath its name. Ranges cover whole-course prices only — where a centre charges per day or per dive, its rate is listed separately below, since a daily figure is not comparable with a course total.
- €250total
- €150total
- €175total
- €200total
- €190total
- THB 10,000total
- ₱18,000total
Same training under a different agency
8 centres
A separate set of centres, teaching Gas Blender (nitrox) under a different agency. These are not the same certification — the standards and the card differ — but they cover the same depth and scope, which is why centres price them alike. Every row here names whose rating it is, and none of them is counted above.
- IDR 5,500,000total
- IDR 3,000,000total
- THB 17,000total
- THB 9,000total
- €80total
- €105total
Charged by the day or dive rather than as a course price:
- $200per day
- ₱18,000total
Same tier, agency not stated
4 centres
These centres publish a price for Gas Blender (nitrox), but their own wording does not say which agency's certification it buys — many teach several and name the card only once you enquire, and some price one course for either agency. The figure is comparable; the certification is not identified, so we do not guess at one.
- €250total
- €105total
- IDR 5,500,000total
- $199total
These prices are not like-for-like. Two centres can charge very differently for the same certification because they include different things. One price may cover twinsets, stages, deco gas and cylinder rental for every training dive, a dedicated classroom for the theory, boat or transport to the site, and the agency's registration and materials; another may be tuition only, with all of that charged separately — or the other way round, with a centre bundling in extras the first leaves out. Class size, whether the course is one-to-one, and how many days are allowed for it move the figure too. Check what each centre's price includes before comparing them, and confirm with the centre before booking.
Consumables are usually extra. Sorb, helium, O₂ and other fills, park and cenote fees, certification fees and rental are commonly charged on top.
Packages combining several certifications, upgrades from an existing one, and open-ended day rates are excluded — none of them is the standalone price of this course, and including them would move the figures away from what a new student can actually book.
Prerequisites
Minimum age 18; no diving certification required.
Standards
What a diver must demonstrate to pass this course — not always published by the certifying agency.
Candidates must demonstrate proper partial-pressure blending calculations, accurate gas analysis techniques, oxygen safety protocols, tank preparation and labeling, and safe storage/handling of nitrox cylinders. Knowledge of regulations governing high-pressure oxygen and enriched-air handling.
Instructors Teaching This Course
United States
Philippines
Egypt
Malta
Mexico
Thailand
Dive Centres Offering This Course
United States
Mexico
Philippines
Egypt
Malta
Thailand
We're still building out the directory country by country, so this list isn't every instructor or dive centre teaching it in the world — more locations are coming soon.
Common questions about TDI Nitrox Gas Blending
How much does TDI Nitrox Gas Blending cost?
Published prices for TDI Nitrox Gas Blending range across 7 centres in the TecDiveTools directory — roughly US$160 to US$300 at current exchange rates. In each centre's own currency: €150–€250 (5 centres), THB 10,000 (1 centre) and ₱18,000 (1 centre). Prices differ mainly in what they include, so compare the inclusions before comparing the numbers. Prices were last checked in September 2026.
How long does TDI Nitrox Gas Blending take?
Between 1 and 2 days, based on the durations 3 centres publish for it. The time depends on the centre's schedule, weather, and how quickly the required skills are demonstrated — agencies set a minimum number of dives, not a fixed number of days.
What are the prerequisites for TDI Nitrox Gas Blending?
TDI's standards require: Minimum age 18; no diving certification required.
What is the minimum age for TDI Nitrox Gas Blending?
TDI's standards state: Minimum age 18.
What does TDI Nitrox Gas Blending training involve?
According to TDI's published standards: Candidates must demonstrate proper partial-pressure blending calculations, accurate gas analysis techniques, oxygen safety protocols, tank preparation and labeling, and safe storage/handling of nitrox cylinders. Knowledge of regulations governing high-pressure oxygen and enriched-air handling.
What is the equivalent of TDI Nitrox Gas Blending in other agencies?
At the same tier in TecDiveTools' cross-agency comparison: IANTD EANx Gas Blender, RAID Gas Blender and PADI TecRec Tec Gas Blender. They cover comparable training, but each agency sets its own standards, depth limits and certification card, so they are comparable rather than interchangeable — check which one your next course accepts.
What course comes after TDI Nitrox Gas Blending?
The next step in TDI's progression is TDI Advanced Gas Blender.
Where can I take TDI Nitrox Gas Blending?
106 dive centres and 168 instructors in the TecDiveTools directory teach TDI Nitrox Gas Blending across 7 countries, most in the United States, the Philippines, Egypt and Mexico. Each is listed further up this page.
Does the price of TDI Nitrox Gas Blending include gas and equipment?
Not always — it varies by centre. Certification fees, equipment rental and boat or site fees are commonly charged on top of the course price. Each centre's price list on TecDiveTools shows what it notes as included.