Repetitive Dive & Surface Interval Planner
Estimate repetitive-dive residual nitrogen, pressure groups, available no-decompression time and cumulative oxygen exposure.
Plan the interval between dives.
Enter two dives and the surface interval. Total dive time is converted to estimated bottom time by subtracting ascent and a 3-minute safety stop.
Altitude and water conditions
Day timeline
How repetitive-dive planning carries nitrogen forward
A repetitive planner tracks residual nitrogen from earlier dives. Surface time reduces the carried pressure group or residual penalty, which is then combined with the next planned depth and bottom time to estimate the remaining no-decompression allowance.
Example: after a first dive, a short surface interval leaves more residual nitrogen than a long interval. The second dive therefore begins with less available no-decompression time than an identical first dive made after full off-gassing.
This tool follows its built-in table model and cannot reproduce every dive-computer algorithm, gradient setting or multilevel profile. Use it as an educational planning reference and follow the most conservative applicable limit.
The calculator updates instantly from the values you enter and shows the core planning result in the dark result card.
Use realistic values from your own diving and leave a practical margin for changes in workload, conditions and equipment.
Treat this page as an educational reference and cross-check the result with your training, analysed gas and an appropriate dive-planning method.