U.S. Navy Dive Tables · Air & Nitrox · Altitude Ready
Conditions
Altitude Sea Level
Water Type Salt Water
Units Imperial
GASSelect Breathing Gas
DIVE 1Depth & Bottom Time
Select a breathing gas above to begin.
NITROGEN LOAD0%
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SAFETY STOP: 3–5 min at 15 ft every dive. Max ascent 30 ft/min. Nitrox: MOD enforced · EAD used for table lookup · same pressure groups apply.
SURFACE INTERVALSurface Interval 1
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Starting pressure group from Dive 1
New Group
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Duration
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minutes
MIN SISurface Interval Planner
Pick your next dive depth — see exactly how much bottom time you get at each surface interval.
Dive 2 Depth
DIVE 2Repetitive Dive — Adjusted NDL
NITROGEN LOAD (DIVE 2)0%
SURFACE INTERVAL 2Surface Interval 2
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Starting pressure group from Dive 2
New Group
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Duration
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minutes
DIVE 33rd Dive — Adjusted NDL
NITROGEN LOAD (DIVE 3)0%
LOGDive Plan Summary
TANKSAC Rate & Air Consumption
Enter your tank and actual dive data to calculate your personal SAC rate.
Tank Used
Your SAC vs. Typical Divers
8 Tech14 Exp20 Avg28+ New
Enter your known SAC rate to plan gas for any dive.
Your SAC vs. Typical Divers
8 Tech14 Exp20 Avg28+ New
Plan a Dive
Tank for Planned Dive
SAC typical: tech 8–14 · recreational 15–25 · stressed 30–40 psi/min. Reserve = 500 psi min. Altitude-corrected ATA when enabled.
FLYFlying After Diving
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select profile above
Dive Profile
Min. Wait
Status
Single no-decompression dive
12 hrs
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Multiple dives / multi-day
18 hrs
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Dives requiring deco stops
>18 hrs
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Source: DAN / UHMS Flying After Diving Workshop Consensus · Minimum intervals only — longer is always safer.
📖DIVE TERMS GLOSSARYCLICK TO EXPAND▼
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NDL
No-Decompression Limit
Tables
▼
Max bottom time at a given depth before mandatory decompression stops are required. Stay within NDL and a normal ascent + 3–5 min safety stop is sufficient.
EAD
Equivalent Air Depth
Nitrox
▼
The shallower air-equivalent depth for nitrox, giving longer NDLs.
EAD = (Depth + 33) × (1 − FO₂) ÷ 0.79 − 33
MOD
Maximum Operating Depth
Nitrox
▼
Deepest safe depth before O₂ partial pressure exceeds 1.4 ATA.
MOD (ft) = (1.4 ÷ FO₂ − 1) × 33
EAN32=111ft · EAN36=95ft · EAN40=79ft
TOD
Theoretical Ocean Depth
Altitude
▼
At altitude, actual depth is converted to TOD for table lookup — corrects for lower atmospheric pressure. Used via PADI altitude correction factors.
TOD = Actual Depth × Correction Factor
PG
Pressure Group
Tables
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Letter A–Q indicating residual nitrogen. A = minimal nitrogen. After a surface interval, nitrogen off-gasses and your letter drops.
RNT
Residual Nitrogen Time
Tables
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Minutes of nitrogen your body is "carrying" from the previous dive. Added to actual BT to get TBT for the NDL check.
SS
Safety Stop
Safety
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3–5 minute pause at 15 ft during ascent. Strongly recommended on every dive, especially deeper than 30 ft.
DCS
Decompression Sickness
Safety
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"The bends." Ascending too fast causes dissolved nitrogen to form bubbles. Emergency: DAN +1-919-684-9111.
SAC
Surface Air Consumption
Tank
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Your breathing rate expressed as psi/min at the surface. Used to predict tank duration at any depth.
SAC = PSI Used ÷ (ATA × Time)
WEIGHTBallast Weight Calculator
Estimates starting ballast weight. Always verify buoyancy in shallow water first.
GEARPre-Dive Equipment Checklist
Check off each item before entering the water.
⚠ Educational Use Only
Not a substitute for dive training or a certified dive computer. Always dive within your certification limits. Never dive alone.
Altitude corrections use PADI depth factors. EAD formula per NOAA/IANTD. Pressure groups from U.S. Navy tables.
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