Plan
Plan your dive, step by step
Enter one or two dives once. Everything else follows from it: an overview with graphs, the surface rest you need, the advised plan with every stage and stop, a stage-by-stage guide and two live dive computers.
For learning only. This is not certified planning software and does not replace training, printed tables or a dive computer.
1Settings
Units
Number of dives
Method for stops and surface time
Computer model: follows every stage of a multi-level profile, like a dive computer.
2Your dives
Dive 1
Breathing gas
Dive 2
Breathing gas
3Overview at a glance
Dive 1 · Air
- Deepest point
- 24 m
- MOD (1.4 bar)
- 56 m
- Equivalent air depth
- 24 m
- Highest ppO₂
- 0.72 bar
- Nitrogen on surfacing
- 70%
- Required stops
- No required stops
- Total dive time
- 42 min
- Gas used
- 1773 L
- Tank at the surface
- 52 bar
Dive 2 · Air
- Deepest point
- 18 m
- MOD (1.4 bar)
- 56 m
- Equivalent air depth
- 18 m
- Highest ppO₂
- 0.59 bar
- Nitrogen on surfacing
- 59%
- Required stops
- No required stops
- Total dive time
- 41 min
- Gas used
- 1494 L
- Tank at the surface
- 76 bar
- Rest
- 1 h 00 min
4No-stop margin & oxygen
How much of your no-stop allowance the dive really uses. The limit is read at your deepest point for the whole bottom time — the same way the printed tables are read.
| Breathing gas | No-stop limit at your depth | Bottom time | Of the allowance |
|---|---|---|---|
| Dive 1 · Air | 23 min | 35 min | 152% |
| Dive 2 · Air | 47 min | 35 min | 74% |
Oxygen exposure for the day
The dose your body takes from the oxygen you breathe. Below 0.5 bar of oxygen pressure the published tables set no limit, so nothing is counted there.
| Breathing gas | CNS (% of the daily allowance) | OTU (lungs) |
|---|---|---|
| Dive 1 · Air | 7% | 10 |
| Dive 2 · Air | 3.7% | 5 |
| Day total | 10.7% | 15 |
Oxygen pressure · Single exposure / 24 hours
| Oxygen pressure | Single exposure | 24 hours |
|---|---|---|
| 0.6 bar | 720 min | 720 min |
| 0.7 bar | 570 min | 570 min |
| 0.8 bar | 450 min | 450 min |
| 0.9 bar | 360 min | 360 min |
| 1.0 bar | 300 min | 300 min |
| 1.1 bar | 240 min | 270 min |
| 1.2 bar | 210 min | 240 min |
| 1.3 bar | 180 min | 210 min |
| 1.4 bar | 150 min | 180 min |
| 1.5 bar | 120 min | 180 min |
| 1.6 bar | 45 min | 150 min |
Limits: US Navy 1991 oxygen exposure limits as published by the NOAA Diving Program. One minute at a listed pressure uses 100 divided by its single-exposure minutes of the daily allowance. OTU: (ppO₂ − 0.5) ÷ 0.5 × minutes.
5Surface time needed
Minimum rest before dive 2
Rest at least 20 min at the surface, then dive 2 needs no required decompression stops.
Other rest times
| Rest | Dive 2 needs |
|---|---|
| 10 min | 3 m · 3 min |
| 20 min | No required stops |
| 30 min | No required stops |
| 45 min | No required stops |
| 1 h 00 min · Your planned rest | No required stops |
| 1 h 30 min | No required stops |
| 2 h 00 min | No required stops |
| 3 h 00 min | No required stops |
| 4 h 00 min | No required stops |
| 6 h 00 min | No required stops |
6What if…
Three quick changes to this dive, each worked out on the spot. Nothing is saved — this only shows what a change would cost you or buy you.
Dive 1
| Change | Bottom time | Stops |
|---|---|---|
| As planned | 35 min | No required stops |
| 3 m shallower | 35 min | No required stops |
| 25% shorter | 26 min | No required stops |
| 25% longer | 44 min | 3 m · 3 min (model: 2 min; minimum 3 min) |
Dive 2
| Change | Bottom time | Stops | Rest needed before it |
|---|---|---|---|
| As planned | 35 min | No required stops | 20 min |
| 3 m shallower | 35 min | No required stops | 10 min |
| 25% shorter | 27 min | No required stops | 10 min |
| 25% longer | 44 min | No required stops | 30 min |
7Advised plan
Advised plan · Dive 1 · Air
| # | What to do | Minutes | Runtime | Gas used | Tank after |
|---|---|---|---|---|---|
| 1 | Descend to 24 m | 1.3 | 1 min | 44 L | 196 bar |
| 2 | Stay at 24 m | 20 | 21 min | 1064 L | 111 bar |
| 3 | Move to 15 m | 1 | 22 min | 1108 L | 108 bar |
| 4 | Stay at 15 m | 15 | 37 min | 1671 L | 61 bar |
| 5 | Ascend to 3 m | 1.3 | 39 min | 1709 L | 58 bar |
| 6 | Safety stop at 3 m (recommended) | 3 | 42 min | 1767 L | 53 bar |
| 7 | Surface | 0.3 | 42 min | 1773 L | 52 bar |
Total dive time: 42 min · Tank at the surface: 52 bar
Advised plan · Dive 2 (Rest 1 h 00 min) · Air
| # | What to do | Minutes | Runtime | Gas used | Tank after |
|---|---|---|---|---|---|
| 1 | Descend to 18 m | 1 | 1 min | 29 L | 198 bar |
| 2 | Stay at 18 m | 25 | 26 min | 1079 L | 110 bar |
| 3 | Move to 10 m | 0.9 | 27 min | 1111 L | 107 bar |
| 4 | Stay at 10 m | 10 | 37 min | 1411 L | 82 bar |
| 5 | Ascend to 3 m | 0.8 | 38 min | 1430 L | 81 bar |
| 6 | Safety stop at 3 m (recommended) | 3 | 41 min | 1488 L | 76 bar |
| 7 | Surface | 0.3 | 41 min | 1494 L | 76 bar |
Total dive time: 41 min · Tank at the surface: 76 bar
8Follow the plan
Stage 1 of 15
Dive 1
Descend to 24 m
- Minutes
- 1.3
- Runtime
- 1 min
- Depth
- 24 m
- Tank after
- 196 bar
9Dive card
Print one card per dive and keep it with your kit. Fill in the date, your buddy and an emergency number by hand.
Dive 1
Computer model (Bühlmann ZHL-16C, GF 85%)- Breathing gas
- Air
- Cylinder size (L)
- 12 L
- Start pressure
- 200 bar
- Reserve pressure
- 50 bar
- Breathing rate on air (L/min at surface)
- 15 L/min
- Deepest point
- 24 m
- MOD (1.4 bar)
- 56 m
- Equivalent air depth
- 24 m
- Total dive time
- 42 min
- Tank at the surface
- 52 bar
- CNS (% of the daily allowance)
- 7%
- OTU (lungs)
- 10
Required stops: No required stops
| What to do | Minutes | Runtime | Tank after |
|---|---|---|---|
| Descend to 24 m | 1.3 | 1 min | 196 bar |
| Stay at 24 m | 20 | 21 min | 111 bar |
| Move to 15 m | 1 | 22 min | 108 bar |
| Stay at 15 m | 15 | 37 min | 61 bar |
| Ascend to 3 m | 1.3 | 39 min | 58 bar |
| Safety stop at 3 m (recommended) | 3 | 42 min | 53 bar |
| Surface | 0.3 | 42 min | 52 bar |
Date
______________________
Buddy
______________________
Emergency / hospital
______________________
Educational plan only — not a substitute for training, a dive computer or certified planning software.
Dive 2
Computer model (Bühlmann ZHL-16C, GF 85%)- Breathing gas
- Air
- Cylinder size (L)
- 12 L
- Start pressure
- 200 bar
- Reserve pressure
- 50 bar
- Breathing rate on air (L/min at surface)
- 15 L/min
- Deepest point
- 18 m
- MOD (1.4 bar)
- 56 m
- Equivalent air depth
- 18 m
- Total dive time
- 41 min
- Tank at the surface
- 76 bar
- CNS (% of the daily allowance)
- 3.7%
- OTU (lungs)
- 5
- Rest
- 1 h 00 min
Required stops: No required stops
| What to do | Minutes | Runtime | Tank after |
|---|---|---|---|
| Descend to 18 m | 1 | 1 min | 198 bar |
| Stay at 18 m | 25 | 26 min | 110 bar |
| Move to 10 m | 0.9 | 27 min | 107 bar |
| Stay at 10 m | 10 | 37 min | 82 bar |
| Ascend to 3 m | 0.8 | 38 min | 81 bar |
| Safety stop at 3 m (recommended) | 3 | 41 min | 76 bar |
| Surface | 0.3 | 41 min | 76 bar |
Date
______________________
Buddy
______________________
Emergency / hospital
______________________
Educational plan only — not a substitute for training, a dive computer or certified planning software.
10Live dive computers
Drag the water column to dive in real time. Both computers start from the dives and gas you entered above; dive 2 starts with the nitrogen left after your surface rest.
Dive 1
Water column
Depth
0.0m
At the surface
Dive time
0:00
Tank
200 bar
Air left
100%
No-stop
—
Nitrogen
0%
Vertical speed
0.0 m/min →
ppO₂
0.21 bar
Live decompression
No stops required — direct ascent allowed
US Navy Table 9-9 stops (live)
No Navy decompression stops required yet.
Dive 2
Surface interval — nitrogen clearing
- 0 min · 78%
- 10 min · 52%
- 30 min · 24%
- 60 min · 1%
Nitrogen left from dive 1 at each point of the interval; dive 2 starts from the last value.
Water column
Depth
0.0m
At the surface
Dive time
0:00
Tank
200 bar
Air left
100%
No-stop
—
Nitrogen
0%
Vertical speed
0.0 m/min →
ppO₂
0.21 bar
Live decompression
No stops required — direct ascent allowed
US Navy Table 9-9 stops (live)
No Navy decompression stops required yet.
Dive 2: Navy schedule also depends on residual nitrogen; see the full page.