how much cement?

[taycat]

now you have kindly sorted my uncles car i can get on with what i was supposed to be doing today.
me and dad extended shed but never got rd to laying floor.
now need to get it done area is tad under 4'x8' how many bags of sand/ cement will i need to do 3" thick floor?
need to move stuff out of main shop as mate's uncle as old southbend lathe that as sat in bits in corner for god knows how long, sprays it once a year with wd40.
all i know is it's 5' long.
hoping to have look on sunday.

 

[Wendelspanswick]

now you have kindly sorted my uncles car i can get on with what i was supposed to be doing today.
me and dad extended shed but never got rd to laying floor.
now need to get it done area is tad under 4'x8' how many bags of sand/ cement will i need to do 3" thick floor?
need to move stuff out of main shop as mate's uncle as old southbend lathe that as sat in bits in corner for god knows how long, sprays it once a year with wd40.
all i know is it's 5' long.
hoping to have look on sunday.

2.4m x 1.2m x 75mm = 0.216 m3 of concrete
So
3 Cement
6 Sand
11 Aggregate
That's 25kg bags.
http://source4me.co.uk/calculate_concrete_mix.php

 

[taycat]

thank you