How many bags of concrete make a yard?

Construction & MaterialsConcrete Batching

Cement & Concrete Batch Calculator

Calculate total concrete volume in cubic yards and determine the exact number of Portland cement bags, sand tons, and crushed stone needed for any pour.

Construction & Materials Field StandardsConcrete Batching

Engineering formulations calibrated to IPC, UPC & NEC specificationsSub-Zero Cold Climate Tolerances

Quick Summary & Key Answer

To calculate concrete: multiply Length × Width × Thickness (in feet) and divide by 27 to find cubic yards. Add 10% for subgrade variations. A standard 24' × 24' garage slab at 4 inches thick requires 7.11 cubic yards (or 7.82 yards with 10% waste, equaling roughly 350 eighty-pound bags).

27 cubic feet = 1 cubic yard.
One 80-lb bag of concrete yields 0.60 cubic feet (45 bags = 1 yard).
Control joints should be saw-cut every 8 to 10 feet in both directions.

Interactive Calculator

Adjust inputs for real-time results

Lengthfeet

feet

Widthfeet

feet

Thickness / Depthinches

inches

Calculated OutputBatch Volume Sized

Total Ready-Mix Concrete (with 10% waste)

7.82 Yds³cu yd

Net Volume Without Waste: 7.11 cu yd
80-lb Pre-Mix Concrete Bags: 353 bags
60-lb Pre-Mix Concrete Bags: 470 bags
Total Slab Surface Area: 576 sq ft

Note: For pours over 2 cubic yards, ordering transit ready-mix truck delivery is significantly cheaper and more structurally uniform than hand mixing bags.

Concrete Control Joint Spacing

Saw-cut control joints to a depth of 1/4 the slab thickness within 12 hours of pouring to control shrinkage cracks.

Frequently Asked Questions

Common questions regarding this calculation and code compliance

It takes forty-five (45) 80-lb bags or sixty (60) 60-lb bags of pre-mixed concrete to make one cubic yard.