how many bags of sand?

[Beemo]

im not sure how many bags i need, maybe someone can help me.
ill be getting aragalive sand (1-2mm sand size) they come in 20 lb water packed bags.
how many bags would i need for a 55 gallon (48" long) and to make a 3" deep sand bed

 

[mbbuna]

try this

http://www.reefcentral.com/calc/SandBed.php

 

[Beemo]

oh cool thnx