All tools
21 available · 3 coming soonCNS interval: when to dive again
Your CNS on surfacing and your target: how long to wait and when to dive again.
CNS reduction
Your CNS on surfacing and your interval: the residual CNS at the start of the next dive.
OTU: pulmonary oxygen toxicity
The oxygen dose your lungs take, over one dive, one day or several days.
Altitude diving
In a mountain lake: the depth to read in your table, your real stops and your ascent rate.
END: narcosis and density
The equivalent narcotic depth of your nitrox or trimix, gas density and the ideal mix.
Trimix blend
The bottom trimix to order for your depth, ppO2 and END, density included.
Tidal currents
The current during your dive, the next slack water and the calm windows of the day.
Heat balance
The heat you lose during your dive, your body temperature drop and the protection to choose.
Compressor payback
Cost per fill, break-even point and years to pay back the purchase.
Pressure & Depth Converter
Instant conversions: bar ↔ psi, metres ↔ feet, absolute pressure ↔ depth, fresh vs salt water.
Air Consumption Calculator
Work out your SAC rate, see how depth affects your air consumption and compare how long your cylinder lasts.
Gas Blender
Cylinder, target mix and available gases: partial pressure blending steps to read on the gauge.
Nitrox Label
Analyse your cylinder and fill in its label step by step: mix, max depth, pressure, initials.
Nitrogen saturation
Play a dive and watch nitrogen enter your body at depth, then leave as you ascend. Bühlmann model.
Decompression Planner
Deco stops, ascent time, optimised dive profile.
Volume & Pressure Converter
Bar, PSI, litres, cu.ft — every dive conversion you need.
Quote Generator
Create and send professional quotes in seconds. Perfect at dive shows or in the shop to build a live quote with your centre’s details.
Book your dives on

The marketplace for dive experiences. Find and book the best outings with certified centres worldwide.
Discover Aster