No-stop limit (NDL) calculator
Find how many minutes you have at a depth before you would need decompression stops, on air or nitrox.
Metric units: m, bar, L, kg.
Result
Inside the no-stop limits at GF 85, with a normal ascent and a safety stop.
- No-stop limit at this depth
- 43 min
- No-stop time left after your planned time
- 3 min
- Surfacing load, of the controlling compartment’s limit at GF 85
- 97%
The form starts on example values.
How it works
The no-stop limit (NDL) is how long you can stay at a depth and still ascend directly to the surface. It comes from the Bühlmann ZH-L16C model with a gradient factor: GF 85 is the default, a lower figure is more conservative. More oxygen in the mix means less nitrogen, so nitrox gives a longer limit, but check the depth against its MOD.
The time is for one level held at a constant depth, starting with no residual nitrogen. It still assumes a normal ascent and a safety stop. Your dive computer tracks the dive you actually make, and it is the one to follow.
Plan multi-level dives in Loggerfish →
The same calculations run in the Loggerfish app.