Excelcalcs;...
(including XLC:An excellent calculation tool using Excel ) The comprehensive repository of engineering
calculations is a valuable tool for engineers.
Mechengcalculators
...Large number of useful calculators with associated formulea
Platonic Realms
...Very Extensive Mathematics Information /formulae
Efunda
....A number of formulae on Engineering topics are found at
Mecanicasoft
..Site including various Calculators and useful links..
Math.Org*
..Site Based on Mathemetic formulae /equations..
Xs4all..A 1M pdf file
with lots of physics formulae- Advanced stuff
Gowelding..A Real Find..this site has lots of
Information on calculating the strength of Welds