how much sand and cement

[rockhardsolidplastering]

approx would i need for25m2 approx 20 mm thick i know i shud know and normally would get a ton bag but thats impossible on this job so need to get them little bags and dont want to fill my lock up up with em after thanks for help

 

[Roofer2plasterer]

TRy this mate..................https://www.source4me.co.uk/calculate_render_stucco.php

 

[pro finish]

there are 3/4 shovels of sand in a bag,depending on size of shovel..
i like to use a bag as a measure on my mixes, so if your mix is avg 4/1 one bag sand + 1 cement.
obviously this will alter between coats.
i mix two bags, 2 cement which is just a barrow.i would say this would do about 6-7 sqm at 10mm
so for 25sq @20mm
id get 20 bags sand and 4 cement maybe 1 lime