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ConvertMyStuff
Tool

Cement Calculator

Convert cubic yards of concrete into an estimated count of 80 lb cement bags.

Construction Calculators

What this tool does

Translate a concrete volume in cubic yards into an approximate number of 80 lb premix bags. Useful for small pads, post holes, and repair work.

How to use

  1. Enter the concrete volume in cubic yards from your slab or footing estimate.
  2. Review the estimated 80 lb bag count.
  3. Adjust for waste and mix design before purchasing.

Examples

3 cubic yard pour

Input: Concrete cubic yards: 3

Output: Estimated 80 lb cement bags: 135

Uses a simplified ratio of about 45 bags per cubic yard for planning estimates.

Assumptions

  • Uses an approximate planning ratio of 45 eighty-pound bags per cubic yard.
  • Actual yield varies by product, slump, and aggregate size.
  • Estimate only — verify against bag label coverage before ordering.

Common use cases

  • Plan bag-mix purchases for small slabs
  • Estimate materials for fence post footings
  • Cross-check contractor bag counts for DIY projects

FAQ

Is this for ready-mix or bag mix?

This tool is intended for bag-mix planning, not ready-mix truck orders.

Do mix designs vary?

Yes. Actual bag counts depend on mix ratio, aggregate, and manufacturer yield.

Should I round up?

Always round up and add extra bags for spillage and partial batches.

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Last reviewed: 2026-05-23