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CNS% Oxygen Exposure Surface Interval Credit Table

Surface Interval
Start 30 MINS 60 MINS 90 MINS 120 MINS 180 MINS 240 MINS 300 MINS 360 MINS
100% 83% 66% 49% 41% 24% 16% 11% 7%
95% 79% 63% 46% 38% 22% 15% 10% 7%
90% 75% 59% 44% 37% 22% 15% 10% 7%
85% 71% 56% 42% 35% 21% 14% 9% 6%
80% 66% 53% 39% 32% 19% 13% 9% 6%
75% 62% 49% 37% 31% 18% 12% 8% 5%
70% 58% 46% 34% 28% 17% 11% 7% 5%
65% 54% 43% 32% 27% 16% 11% 7% 5%
60% 50% 40% 29% 24% 14% 9% 6% 4%
55% 46% 36% 27% 22% 13% 9% 6% 4%
50% 41% 33% 24% 20% 12% 8% 5% 3%
45% 37% 30% 22% 18% 11% 7% 5% 3%
40% 33% 26% 20% 17% 10% 7% 5% 3%
35% 29% 23% 17% 14% 8% 5% 3% 2%
30% 25% 20% 15% 12% 7% 5% 3% 2%
25% 21% 16% 12% 10% 6% 4% 3% 2%
20% 17% 13% 10% 8% 5% 3% 2% 1%
15% 12% 10% 7% 6% 3% 2% 1% 1%
10% 8% 7% 5% 4% 2% 1% 1% 1%
Start 30 MINS 60 MINS 90 MINS 120 MINS 180 MINS 240 MINS 300 MINS 360 MINS

The CNS Oxygen Exposure Table allows divers to calculate credit towards accumulated oxygen debt during surface intervals. Find the CNS Oxygen Exposure percentage following a dive in the left hand chart then follow the row across to find the adjusted CNS percentage based on the time spent at the surface. When using this table, divers round up to the nearest starting percentage and round down to the closest time in minutes. For example, a diver exiting the water with a 42% CNS debt would round up to 45%. If they stayed out of the water for 67 minutes they would use the figure in the 60 minute column. Diving with mixed gases such as Enriched Air Nitrox or Trimix requires special training. This chart is presented for informational purposes only. SportDiverHQ makes no guarantee concerning the table's accuracy.

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