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Global Guide to Tropical Cyclone Forecasting:
Chapter 9: Ready Reckoner

9.3 UNIT CONVERSION

Multiply the line unit by the indicated number to get the column unit; for example, on the first line inches multiplied by 12 gives 1 ft in the second column. Only conversions to higher values are shown. Take care to convert to the degree of accuracy of the original observation only; for example a ship estimate of 20 kt based on sea state should convert to 10 ms-1, a literal transformation to 10.256 ms-1 is incorrect.

Length
  in ft mi nm mm m km olat
in 1 12 6.336x104 7.30x104 * 39.37 39370 4.38x106
ft * 1 5280 6080 * 3.28 3281 364320
mi * * 1 1.15 * * * 69
nm       1 * * * 6  0
mm 25.4 304.8 1.61x106 1.85x106 1 102 105 1.11137x107
m     1609 1853   1 103 1.11137x105
km     1.61 1.853     1 111.137

 

Time
  sec min hour day
sec 1 60 3.6x103 8.64x104
min * 1 60 1.44x103
hour     1 24

 

Speed
  km h-1 mph kt ms-1
km h-1 1 1.61 1.85 3.6
mph   1 1.15 2.24
kt     1 1.95

Conversion oC to oF

Conversion K to oC

Contents Chapter9.4


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