Greenpepper's Concrete Calculator  
aussieflagUses Australian Measures/Quantities - i.e. Metric: Litres/Kilogram.  and 20kg cement bags. 
Common concrete mixers turn out one or two cubic feet of concrete.  And one or two cubic feet is a handy barrow load:  One, easily managed,  Two is quite heavy.  (about 300lb, 136kg)   A 'professional'  builder's wheelbarrow may well be 6 cubic feet (180 Litres).  You'd have a hard time moving that amount of concrete .
Be aware that cement out of the bag will expand to occupy more space.  So to get the same weight you'll  need to measure more volume into your mix. You may need to increase the measured volume by as much as one third.  
Note: reo mesh/plastic sheet prices/areas are only valid when the concrete is considered as a slab with one layer of mesh.
           Height: (Metres)


Cement Price/20kg Bag
Breadth: (Metres)


Sand Price/Tonne (1000kg)
Width: (Metres)

Aggregate Price/Tonne (1000kg
 Reinforcing Mesh Price / Square metre
 Plastic Sheet Price / Square Metre

A Forum to air your opinion of this calculator or anything else you like.   Greenpepper Forum   
Unfortunately it turns out to be quite difficult to protect a Forum against spammers and hackers. Hence the Forum is a mess. I'm working on it. Sorry.  :)
Disclaimer:  This site is offered as a 'loook over my shoulder' to see what I do. It is NOT offered as competent technical advice and I will accept no responsibility for any loss or damage caused by following the figures produced here.  I am not a builder, a tradesman, an architect or any kind of trained, licensed, experienced operator in this field. This page could be riddled with errors and prices and practices vary throughout the world. Be warned. Protect yourself. Check, check, check.
A basic check is to input the values for 1 cubic metre of concrete.  Don't forget to alter costs to suit local conditions.