Concrete Bag Calculator

Calculate how many bags of concrete you need for your project. Get accurate estimates for 60-lb and 80-lb bag quantities

60-lb Bags
80-lb Bags
All Projects

Concrete Bag Calculator

Project Type

Dimensions

Slabs, Square Footings, or Walls diagram

Slabs, Square Footings, or Walls Shape

Add extra volume for waste, spills, and measurement variations

Concrete Strength & Pricing Guide

Concrete prices vary based on strength requirements. Different PSI ratings (3000, 4000, 5000+) come with different costs to reflect material composition and performance characteristics.

Pricing Factors:

  • • Concrete strength and mix specifications
  • • Delivery distance and transportation fees
  • • Minimum order quantities and service charges

For current pricing in your area, contact local suppliers or visit American Concrete Institute.

Enter project parameters and click Calculate

Why Use Our Bag Calculator?

Accurate Bag Counts – Calculate exact number of 60-lb and 80-lb bags needed
Cost Savings – Buy the right amount and avoid waste or shortages
Multiple Bag Sizes – See calculations for both 60-lb and 80-lb bag options
Volume Display – View total concrete volume in cubic yards and cubic feet
Material Breakdown – Detailed cement, sand, gravel, and water quantities

How to Calculate Concrete Bags

Follow these simple steps to calculate bags of concrete for your project:

1
Measure Your Project – Enter length, width, and thickness/height dimensions
2
Choose Your Units – Select feet, inches, yards, or metric measurements
3
Select Concrete Grade – Choose appropriate strength for your application
4
Get Bag Counts – See how many 60-lb and 80-lb bags you need

Common Concrete Bag Sizes

60-lb Bags

Standard size for small to medium projects. Easier to handle and transport.

Coverage: ~0.45 cubic feet per bag

80-lb Bags

Most economical option for larger projects. More concrete per bag.

Coverage: ~0.60 cubic feet per bag

Ready-Mix Alternative

For projects over 1 cubic yard, ready-mix concrete is more economical.

Threshold: ~45 bags (80-lb) = 1 yard

Bag Calculator Features

Precise Measurements

Input exact dimensions with support for feet, inches, yards, and metric units.

Accurate Bag Counts

Get precise number of bags needed based on actual concrete density calculations.

Instant Results

Get immediate calculations showing both 60-lb and 80-lb bag requirements.

Bag Calculator FAQ

Use our calculator to determine the exact number. As a general guide: 1 cubic yard requires approximately 45 bags of 80-lb concrete. For smaller projects, measure your area and multiply length × width × thickness to get volume in cubic feet, then divide by 0.6 (coverage per 80-lb bag).

One 80-lb bag covers about 0.6 cubic feet, while a 60-lb bag covers about 0.45 cubic feet. Therefore, you need approximately 1.33 bags of 60-lb concrete to equal one 80-lb bag.

80-lb bags are more economical for larger projects and provide more coverage per bag. 60-lb bags are easier to handle and better for small projects or situations where you need to carry bags longer distances. Our calculator shows both options so you can choose.

Measure length, width, and thickness of your slab. Enter these dimensions into our calculator, and it will instantly show how many 60-lb and 80-lb bags you need. Always add 5-10% extra for waste.

For projects requiring more than 1 cubic yard (about 45 bags of 80-lb concrete), ready-mix is typically more economical and convenient. Ready-mix also ensures better consistency and saves labor time.

Calculate Your Concrete Bags Today

Get accurate bag calculations for your concrete project. Whether you need 60-lb or 80-lb bags, our calculator provides precise quantities to help you buy the right amount and avoid waste.

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