Concrete Bag Yield Calculator
Translate cubic feet of concrete into the number of pre-mix bags you need at 40, 60, or 80 lb per bag.
Result
General calculation reads
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How to use this calculator
- Enter the volume of concrete you need in cubic feet.
- Pick a bag size — 80 lb is the most economical for medium jobs, 60 lb easier to lift.
- Read the bag count and total weight.
About this calculator
Pre-mix bags are convenient for small repairs but get expensive fast — about 1 yd³ per ~45 bags of 80-lb mix. Use bags for posts, repairs, and small pads under ~1 yd³; switch to a ready-mix truck above that. The yields here come from manufacturer data: a 40-lb bag yields ~0.30 ft³, 60-lb ~0.45 ft³, 80-lb ~0.60 ft³.
Frequently asked
When should I switch from bags to ready-mix?+
Why are the per-bag yields different?+
Are these yields the same brand-to-brand?+
Do I need to add water weight to my total?+
What if my project is fence-post setting?+
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Pre-fill a fillable PDF form (AcroForm) — type one line per field as `name=value`. Output is a filled PDF you can sign or print.