THEORETICAL DEPTH AT ALTITUDE - IMPERIAL (UPDATED VERSION)
Surface Atmospheric Pressure (in atm)
at Various Altitudes (of feet above sea level)
                     
1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000
0.9644 0.9298 0.8962 0.8637 0.8320 0.8014 0.7716 0.7428 0.7148 0.6877
Actual
Depth Theoretical Ocean Depth (in fsw)
(ffw) at Various Altitudes (of feet above sea level)
                     
1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000
0 0 0 0 0 0 0 0 0 0 0
10 10 10 11 11 12 12 13 13 14 14
20 20 21 22 23 23 24 25 26 27 28
30 30 31 33 34 35 36 38 39 41 42
40 40 42 43 45 47 49 50 52 54 57
50 50 52 54 56 59 61 63 66 68 71
60 61 63 65 68 70 73 76 79 82 85
70 71 73 76 79 82 85 88 92 95 99
80 81 84 87 90 94 97 101 105 109 113
90 91 94 98 101 105 109 114 118 123 127
100 101 105 109 113 117 122 126 131 136 142
110 111 115 120 124 129 134 139 144 150 156
120 121 126 130 135 140 146 151 157 163 170
130 131 136 141 147 152 158 164 170 177 184
Ocean
Stop
Depth Safety/Emergency Decompression Stop Depth (in ffw)
(fsw) at Various Altitudes (of feet above sea level)
                     
1,000 2,000 3,000 4,000 5,000 6,000 7,000 8,000 9,000 10,000
15 15 14 14 13 13 12 12 11 11 11
20 20 19 18 18 17 16 16 15 15 14