How do you know what size a flower head is ?

I would like to order flowers on-line. Roses, etc...they offer many colors and sizes, I don't know the size 6cm or the other sizes mentioned .how do I find a way to compare or learn to convert sizes? can a florist or someone that understands my question help.....Thank-You, maria

How do you know what size a flower head is ?
cm = centimeters.





It's the average size - across - of the flower, given in cm (centimeters) or occasionally inches.





Most rulers will have cm as well as inches.
Reply:...with SCIENCE!
Reply:If you measure the bed you need to take your length and multiply it by your width
Reply:To convert centimeters into inches multiply by 0.3937. To convert inches into centimeters multiply by 2.540. This is easiest with a calculator of course, but if you do it enough you'll develop at least a rough idea on your own.


6 x 0.3937 = 2.3622


2.3622 x 2.540 = 5.99988


so 6cm is a little under two and a half inches.