>Program that converts KM to M, Cm to KM >, ml to l and all kind of conversion ..... Concerning the prefixes let k=1000, d=0,1, c=0,01 and m=0,001 then to enter 10km you just type 10k - it would be very complicated to make a program remembering the units like =*0,5kg*(10m / 5s)^2 = 1J Kasper