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This posting expresses the personal view and opinions of the author.
Something which everyone on this planet should be able to do.
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Norman, I use Teten's formula in my excel spreadsheets to derive dewpoint from
T/RH
http://www.paroscientific.com/dewpoint.htm

You'll have to a little bit of schoolboy maths to transpose the equation to get
RH from T/Td !

Will.
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" A cup is most useful when empty "
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A COL BH site in East Dartmoor at Haytor, Devon 310m asl (1017 feet).

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Norman Lynagh wrote in message ...
Does anyone have a formula for calculating relative humidity using
temperature and dew-point as input data? I have a large number of these
calculations to do and using Excel is a much more attractive proposition
than using look-up tables.

Norman
(delete "thisbit" twice to e-mail)
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Norman Lynagh Weather Consultancy
Chalfont St Giles
England