Barometric Pressure Table

This table converts between some common units used to measure atmospheric pressure. The first three columns are the heights of a column of mercury. The fourth column is the true pressure in kilopascals (kPa). The last column is the approximate density of the atmosphere at the indicated pressure at 20 degrees Celsius.

Inches Millimetres Millibars Kilopascales Density (20°C)
in (Hg) mm (Hg) mb kPa kg/m3
28.0 711.7 948.2 94.82 1.14
28.1 714.3 951.6 95.16 1.14
28.2 716.8 954.9 95.49 1.15
28.3 719.3 958.3 95.83 1.15
28.4 721.9 961.7 96.17 1.15
28.5 724.4 965.1 96.51 1.16
28.6 727.0 968.5 96.85 1.16
28.7 729.5 971.9 97.19 1.17
28.8 732.0 975.3 97.53 1.17
28.9 734.6 978.7 97.87 1.17
29.0 737.1 982.0 98.20 1.18
29.1 739.7 985.4 98.54 1.18
29.2 742.2 988.8 98.88 1.19
29.3 744.8 992.2 99.22 1.19
29.4 747.3 995.6 99.56 1.19
29.5 749.8 999.0 99.90 1.20
29.6 752.4 1002.4 100.24 1.20
29.7 754.9 1005.7 100.57 1.21
29.8 757.5 1009.1 100.91 1.21
29.9 760.0 1012.5 101.25 1.22
30.0 762.5 1015.9 101.59 1.22
30.1 765.1 1019.3 101.93 1.22
30.2 767.6 1022.7 102.27 1.23
30.3 770.2 1026.1 102.61 1.23
30.4 772.7 1029.4 102.94 1.24
30.5 775.3 1032.8 103.28 1.24
30.6 777.8 1036.2 103.62 1.24
30.7 780.3 1039.6 103.96 1.25
30.8 782.9 1043.0 104.30 1.25
30.9 785.4 1046.4 104.64 1.26
31.0 788.0 1049.8 104.98 1.26
31.1 790.5 1053.1 105.31 1.26