⚠️ Educational tool — not dive-planning software
This page is for learning and rough estimates only. Always follow your training, your dive tables, and your dive computer — they account for factors a web page cannot. Never plan a real dive from a website.
Saved on this device, so you can come back between dives.
Surface interval so far
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15 minutes
Barely a pause — your body has only just started off-gassing nitrogen.
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1 hour
Many agencies suggest at least an hour between deep repetitive dives. Your tables or computer set the real number.
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3 hours
A generous interval that meaningfully lowers residual nitrogen before a repetitive dive.
This planner shows elapsed time only — it does not compute pressure groups or residual nitrogen. Those depend on your depth, time, and the tables or computer you dive with.
How it works
This is deliberately a timer, not a decompression calculator. It shows one number:
surface interval = current time − time you surfaced
It does not compute pressure groups or residual nitrogen. Those depend on your exact depths, bottom times, and which table or algorithm you dive — PADI RDP, SSI tables, and every computer model handle them differently, and mixing systems mid-calculation is how mistakes happen. Use the table you were certified on, or let your dive computer do it continuously.
What the milestones remind you of: off-gassing starts the moment you surface but is slow at first; many agencies suggest at least an hour between deep repetitive dives; and a longer interval always means less residual nitrogen going into the next dive. When in doubt, extend the interval — lunch on the boat never hurt anyone's dive plan.