Online Dive Tables
& Decompression Tools
Consult MN90, MT2019, COMEX and Bühlmann ZH-L16C tables online.
Learn how to read dive tables, compare decompression models and use practical calculators for nitrox and air consumption.
MN90 Tables
FFESSM / CMAS| Depth | Time | 3m | 6m | 9m |
|---|---|---|---|---|
| 40m | 15 min | — | — | — |
| 40m | 20 min | 2 min | — | — |
| 40m | 25 min | 5 min | 2 min | — |
| 40m | 30 min | 9 min | 5 min | 1 min |
| 40m | 35 min | 16 min | 9 min | 2 min |
Free online dive tables for decompression planning
Dive Tables gives quick access to the main decompression references used by recreational, technical and professional divers: MN90 tables, MT2019 tables, COMEX tables and the Bühlmann ZH-L16C algorithm.
Use these pages to understand no-decompression limits, decompression stops, ascent procedures, residual nitrogen, successive dives and the logic behind modern dive computers. If you are learning decompression planning, start with the guide to reading dive tables, review the gas laws used in diving, then practise with the Nitrox calculator and air consumption calculator.
The tools are educational and should always be used alongside proper training and qualified supervision.
What do you want to do?
Choose the fastest path depending on whether you want to consult a table, understand decompression, use a calculator, or read practical background articles.
Choose Your Table
Official data from verified sources — French Navy, French Official Journal, University of Zurich
MN90 Tables
French Navy 1990 standard. Reference for CMAS/FFESSM certifications (N2-N4). Stops at 3m, 6m, 9m. Max depth 65m.
Open MN90 tableMT2019 Tables
French Official Journal 2019. Professional diving standard. 11 appendices covering air, nitrox and heliox.
Open MT2019 tableCOMEX Tables
Professional & commercial diving tables. Used in offshore, underwater construction and industrial operations.
Explore COMEX tablesBühlmann ZH-L16
Dr. Bühlmann's model (University of Zurich). Foundation of modern dive computers. ZH-L16C with Gradient Factors.
View Bühlmann coefficientsWhat can you do on Dive Tables?
Read tables — Learn how to round depth and bottom time, find decompression stops and read a Successive Dive Group in the step-by-step guide.
Compare models — Understand the differences between MN90 and MT2019, plus COMEX and Bühlmann ZH-L16C.
Use calculators — Estimate Nitrox MOD/EAD and air consumption with dedicated tools.
Prepare training — Review the concepts required for FFESSM/CMAS levels and decompression exercises.
Why use dive tables?
Training — Required for FFESSM certifications, instructor theory and decompression exercises.
Backup procedure — Understand emergency backup procedures if a dive computer fails.
Understanding — Learn how decompression models work instead of only following a screen.
Planning — Prepare dives, compare models and check assumptions before entering the water.
Guides & Tools
Educational resources and calculators to support your diving practice
Read the tables
Step-by-step guide: stops, TDT, SDG, successive dives.
GuideFFESSM Levels
N1 to N4, E1 to E4: privileges, CMAS equivalences.
GuidePADI vs FFESSM
Comparison of both certification systems.
GuideMN90 vs MT2019
Differences between the two French standards.
GuideGas Laws
Boyle, Dalton, Henry: the physics of diving.
ReferenceGlossary
All diving technical terms explained.
ToolNitrox Calculator
MOD, EAD, ppO₂ — instant calculations.
ToolAir Consumption
SAC rate, autonomy, safety reserve.
Popular Diving Articles
Extra explanations to understand dive computers, Gradient Factors and table-based planning
Gradient Factors Explained
Understand GF Low and GF High in Bühlmann decompression planning and how they affect first stops and surfacing limits.
Read Gradient Factors guide ArticleDive Tables vs Dive Computers
Learn when to use dive tables, dive computers and backup procedures during recreational or technical dive planning.
Compare tables and computers ArticleHistory of MN90 Tables
Discover why MN90 tables became an important reference in French recreational diving and FFESSM training.
Read MN90 history ArticleAll Diving Articles
Browse decompression theory, diving tables, algorithms and practical guides for scuba training.
Open the blogDisclaimer: Data provided for informational purposes only. Always follow your training and use a dive computer. Diving involves inherent risks.