If you're thinking about pouring your own concrete, premixed concrete bags are the easiest option. Keep reading to figure out the exact number of bags you'll need for your project.
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4 Easy Steps to Determine How Many Bags of Concrete Your Need:
1. Measure the area in cubic feet.
2. Add 10% to account for small spills and slight variations in depth.
3. Divide by 0.6 (because each bag yields 0.6 cubic feet).
4. Round up to the nearest whole number.
Example:
Slab is 12 ft. x 6 ft. x 0.34 feet = 40.8 cubic feet.
40.8 x 1.10 = 44.9 cubic feet.
44.9/0.6 = 74.8
Buy 75 bags of concrete (80lb. bags).
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DIY or Hire a Concrete Contractor?
For a small project, using premixed concrete bags and doing it yourself might make sense.
If you're considering pouring your own concrete slab or another major project, be aware that it's a big job. You'll need to buy a number of materials and tools, and possibly rent a powered mixer.
To see what it would cost to hire a contractor,
answer a few questions here to get free estimates from concrete contractors in your area.
Related:

Concrete Slab Thickness

ProMatcher's Concrete Cost Report

What is ReadyMix Concrete?