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🛠️ DIY

Concrete Quantity Calculator

Ordering too little concrete wastes time; ordering too much wastes money. This calculator tells you exactly how many bags of pre-mix or cubic yards of ready-mix concrete you need for any slab, patio, or foundation.

How to Use This Tool

  1. Enter the length and width of the area in feet.
  2. Enter the desired thickness in inches (standard driveway = 4 inches, sidewalk = 4 inches, patio = 4-6 inches).
  3. Keep the waste factor at 10% or increase for irregular shapes.
  4. Click Calculate to get bag count and cubic yards.

The Formula

Volume = Length x Width x Thickness. Each 80-lb bag yields approximately 0.60 cubic feet of concrete. Each 60-lb bag yields approximately 0.45 cubic feet. Ready-mix is sold by the cubic yard (1 yd = 27 ft^3).

Why It Matters

You are pouring a 20x10ft driveway at 4 inches thick. You need 2.47 cubic yards of concrete — about 38 bags of 80lb mix. Ordering 40 bags gives you a safety margin. Total cost: ~$240 at $6/bag.

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