No Decompression Limits (NDL) Calculator
The Multi–Dive No–Decompression Limits (NDL) Calculator quickly shows your no–deco times for two consecutive dives by taking into account:
- Dive 1: Enter depth and bottom time to get your ending pressure group and confirm your maximum NDL.
- Surface Interval: Enter how long you plan to wait on the surface to see how much residual nitrogen “leaks off” and what starting group you’ll be in for Dive 2.
- Dive 2: Enter your second-dive depth and bottom time to see both the fresh-dive NDL and the reduced repetitive-dive NDL based on your first dive’s residual nitrogen.
All in one tool—so you can instantly check that neither dive (nor the combination of both) exceeds no-decompression limits.
Important Warning: The calculators provided on this page are intended for reference purposes only. While we strive for accuracy, divers are strongly advised to verify the output of these calculators independently before use. Always double-check calculations and consider all safety factors relevant to your specific diving conditions and experience level. Diving without proper verification and planning can be dangerous. Dive safely and responsibly.
