PORT CALCULATOR
Decompression Stops
A precise tool.
What is the Decompression Stops & How does it work?
When a diver ascends, the surrounding pressure drops and inert gases that have dissolved in the body begin to come out of solution. If the ascent is too rapid, these gases can form bubbles, leading to decompression sickness. To mitigate this risk, divers perform staged stops at shallower depths, allowing excess gas to be eliminated safely.
The depth of each stop and its duration are calculated based on the dive profile: maximum depth, bottom time, and the ascent rate. A common rule of thumb is to stop every 3 m (10 ft) during ascent, with the stop time proportional to the pressure at that depth. This staged approach reduces the pressure gradient and gives the body time to off‑gas.
Mathematically, the total ascent time (T) can be expressed as the sum of the continuous ascent time and the cumulative stop times. The formula below captures this relationship, where (D) is the maximum depth, (R) the ascent rate, and (t_i) the duration of each stop at depth (d_i).
T = frac{D}{R} + sum_{i=1}^{N} t_i
D = maximum depth (m), R = ascent rate (m/min), t_i = stop time at depth (d_i) (min)
Parameters
Result
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Frequently Asked Questions
What is decompression sickness?
Decompression sickness occurs when dissolved gases form bubbles in the body during rapid ascent from deep dives.
How do staged stops help prevent decompression sickness?
Staged stops allow excess gas to be safely eliminated as a diver ascends, reducing the risk of bubble formation.
What factors are considered when calculating decompression stops?
The calculator considers maximum depth, bottom time, and ascent rate to determine stop depths and durations.
Can I use this calculator for any type of dive?
This calculator is suitable for recreational scuba diving but may not be appropriate for technical or saturation diving.
What should I do if I experience symptoms of decompression sickness after a dive?
Seek medical attention immediately as decompression sickness requires prompt treatment to prevent serious health issues.
How accurate are the calculations provided by this calculator?
The accuracy depends on various factors, including individual physiology and dive conditions. It is recommended to follow additional safety guidelines and consult with a diving professional.
Can I modify the ascent rate in the calculator?
Yes, you can adjust the ascent rate to reflect different diving scenarios or personal preferences.
Results are for informational purposes only and do not constitute professional advice.