Dive tools
Dive Planning Tools
Planning helpers for certified divers. Not a substitute for training or your computer.
Tool 1 · MOD + PPO₂ Check
Maximum Operating Depth
Set your gas, PPO₂ limit, and planned depth to see MOD, PPO₂ at depth, and a suggested mix.
How to use this:
1) Pick your O₂% and max PPO₂.
2) Move the Planned depth slider.
3) Compare PPO₂ at that depth to your MOD.
The Recommended O₂ line shows what mix would reach your PPO₂ limit at that depth.
O₂ percentage
32%
This slider sets the gas you are planning to breathe.
Max PPO₂
1.4 ATA
This is the PPO₂ limit you plan around (for MOD and Recommended O₂).
Units
Planned depth
60 ft
This slider sets how deep you want to go on the gas above.
PPO₂ at planned depth and Recommended O₂ both update when you move this.
PPO₂ at planned depth
1.20 ATA
≤ 1.4 ATA
Color key: green ≤ 1.4 · yellow 1.4–1.6 · red ＞ 1.6.
Maximum operating depth
111
ft
≈ 34 m
Recommended O₂ at this planned depth for your current PPO₂ limit:
—
Based on a simple saltwater model with surface pressure 1 ATA.
Formula used
FO₂ = O₂% / 100
Depth(ft) = (PPO₂_limit / FO₂ − 1) × 33
Depth(m) = (PPO₂_limit / FO₂ − 1) × 10
Tool 2 · Best Mix Planner
Best Nitrox Mix
Choose PPO₂ and depth to see a recommended O₂ percentage for that working limit.
Units
Target PPO₂
1.4 ATA
This is the PPO₂ you plan to work at during the dive.
Planned depth
60 ft
Recommended O₂
—
% O₂
Set PPO₂ and depth to see the best mix for that working limit.
Formula used
ATA(ft) = Depth(ft) / 33 + 1
ATA(m) = Depth(m) / 10 + 1
Best FO₂ = PPO₂_target / ATA
Best O₂% = Best FO₂ × 100
Tool 3 · SAC & Gas Use
Surface Air Consumption
Estimate your SAC rate and gas use from a single dive profile.
Cylinder
Used to convert pressure change to gas volume.
Start pressure
3000 psi
End pressure
800 psi
Average depth
50 ft
Time at depth
40 min
SAC rate
0.60
cu ft / min
Dive used ~24.0 cu ft at 50 ft (2.5 ATA).
SAC result is approximate and based only on the simple model entered here.
Formula used
GasUsed = TankVolume × (Δpsi / WorkingPressure)
Δpsi = StartPressure − EndPressure
ATA = Depth(ft) / 33 + 1
SAC = GasUsed / (Time × ATA)
Tool 4 · Weighting Estimator
Starting Dive Weight
Estimate a starting amount of weight from your body weight, suit, salinity, tank, BCD style, body type, preference, and experience.
Body weight
Required · lb
Enter your weight in pounds.
Water type / salinity
Freshwater often needs several pounds less weight. Very salty water can need a bit more.
Exposure suit
Cylinder
BCD style
Use this to nudge the estimate if your BCD is very light, bulky, or includes a backplate.
Personal preference
Body type
Use this if you know you are especially floaty or dense in the water.
Experience level
New divers often carry a bit more weight while buoyancy skills develop.
Suggested starting weight
0
lb
Enter your details to see a suggested range.
Baseline: 0 lb
Suit: +0 lb
Tank: +0 lb
Water: +0 lb
BCD: +0 lb
Body: +0 lb
Experience: +0 lb
Raw calc: 0 lb
This tool uses a 2 lb minimum for safety. You’ll never see 0 in the main result, but the raw calc chip shows the unadjusted value.
Tool 5 · No-Stop Limits Guide
Recreational No-Deco Helper
Pick PADI or NAUI, choose feet or meters, and get an approximate no-stop limit for a single dive.
Training agency
Uses approximate values based on the respective recreational air tables.
Units
Planned depth
60 ft
The table uses the next deeper depth for planning to stay conservative.
No-stop limit
—
minutes
Choose agency, units, and depth to see an approximate limit.
How this helper works
• Looks up a depth from a small set of standard table depths
• Uses the next deeper table depth than your planned depth
• Shows the associated no-stop limit for a single air dive
Always confirm with your official tables or dive computer, especially for repetitive or multi-level dives.
Tool 6 · Gas Time Remaining
Gas Time Remaining (GTR)
Estimate how many minutes you can stay at depth before reaching your chosen reserve pressure.
Cylinder
Used to convert pressure to gas volume for time estimates.
Current pressure
2800 psi
Reserve pressure
800 psi
Depth
60 ft
SAC rate
Enter your SAC rate in cu ft/min (from Tool 3) to see a time estimate.
Gas time remaining
—
minutes
Enter your SAC rate in cu ft/min (from Tool 3) to see a time estimate.