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Concrete Calculator

Calculate concrete volume in cubic yards, cubic feet, and 60lb/80lb bags needed for slabs, footings, and columns.

Select the concrete pour shape.
Length in feet.
Width in feet.
Diameter for round columns.
Thickness in inches (4in is standard for residential slabs).
Number of identical pours.
Recommended: 10% for uneven subgrade and spillage.
Concrete Needed (Cubic Yards) 1.36 yd³
Concrete Needed (Cubic Feet) 36.67 ft³
Concrete Needed (Cubic Meters) 1.04 m³
80lb Pre-mix Bags 62 bags
60lb Pre-mix Bags 82 bags
Total Weight 5,317 lbs
Editorial Standard

GetCalcu Methodology & Editorial Standards

Reviewed: September 2026

ASTM International standard specifications for construction materials and standard architectural coverage ratios.

Reference Sources: GetCalcu Construction & Building Estimations Board

How to Calculate Concrete Volume Accurately

Ordering concrete accurately prevents expensive short-load fees or messy excess waste.

Cubic Yards Calculation

Concrete is measured in cubic yards (27 cubic feet). Multiply length by width by depth in feet, then divide by 27.

How to Use the Concrete Calculator

  1. 1
    Select slab, footing, or column shape.
  2. 2
    Enter dimensions in feet and thickness in inches.
  3. 3
    Review cubic yards and bag count required.

Concrete Calculator Formula

yd³ = (ft × ft × (in / 12)) / 27

Real-World Worked Examples

These scenarios demonstrate how key input parameters alter your calculation outcome.

10x10 Patio Slab (4in deep)

Input: 10ft × 10ft × 4in, 10% waste
Result: 1.36 Cubic Yards (62 bags of 80lb)

Frequently Asked Questions

How thick should a concrete patio be?

Standard residential patios and sidewalks are typically 4 inches thick.