How much area does an 80lb bag of concrete cover?

Concrete Calculator - Slabs, Footers & Bags (Cubic Yards) (2026)

Calculate cubic yards of ready-mix concrete needed for slabs, driveways, and footings. Includes exact number of 60lb and 80lb bags required.

⚙️ Configuration & Inputs

Length (Feet)

Width (Feet)

Slab Thickness (Inches)4" standard patio, 6" heavy driveway

📊 Results & Analysis

Concrete Volume Required

2.47 cu yds

Or 111 bags (80 lb) / 148 bags (60 lb)

Volume in Cubic Feet	66.7 cu ft
Volume in Cubic Yards (with 10% spill)	2.72 cu yds
80-lb Pre-Mix Concrete Bags	111 Bags
60-lb Pre-Mix Concrete Bags	148 Bags

How to Calculate Cubic Yards of Concrete

Concrete is sold and poured by the cubic yard (27 cubic feet). To calculate: (Length in ft × Width in ft × Thickness in ft) ÷ 27. Since thickness is usually in inches, divide inches by 12 first.

Frequently Asked Questions

An 80-pound bag yields approximately 0.60 cubic feet of mixed concrete. It takes 45 bags of 80lb concrete to make 1 full cubic yard.