How Many Cubic Feet in a Bag of Quikrete?

If you’re planning a concrete project, one of the first questions you’ll probably ask is: how many cubic feet in a bag of Quikrete?

The answer depends on the size of the bag. Quikrete sells several bag sizes, and each produces a different amount of mixed concrete.

Here is the quick answer:

A 40-pound bag yields about 0.30 cubic feet.
A 50-pound bag yields about 0.37 cubic feet.
A 60-pound bag yields about 0.45 cubic feet.
An 80-pound bag yields about 0.60 cubic feet.

Knowing these numbers can help you avoid buying too much or too little concrete for your project.

Whether you are pouring a patio, setting fence posts, or building footings, this guide explains everything you need to know about Quikrete bag yields.

Quick Answer

The amount of concrete produced by a bag of Quikrete varies by weight.

Bag Size	Approximate Yield
40 lb	0.30 cubic feet
50 lb	0.37 cubic feet
60 lb	0.45 cubic feet
80 lb	0.60 cubic feet

In general, the larger the bag, the greater the volume of mixed concrete.

Quikrete Yield Chart by Bag Size

The following chart shows the most common Quikrete bag sizes and their yields.

Quikrete Bag	Cubic Feet Produced
40-pound bag	0.30 cu ft
50-pound bag	0.37 cu ft
60-pound bag	0.45 cu ft
80-pound bag	0.60 cu ft

These values represent the amount of concrete after mixing with water.

Understanding Cubic Feet and Concrete Yield

Before buying materials, it helps to understand what cubic feet actually means.

What Is a Cubic Foot?

A cubic foot is a measurement of volume.

It represents a cube that measures:

1 foot long
1 foot wide
1 foot high

The formula for calculating volume is:

$V = lwh$ V=lwh

$V = 4 \times 3 \times 2 = 24$ V=4×3×2=24

$l$ l

$w$ w

$h$ h

$h$ hl = 4h = 2w = 3

For example:

A box measuring 1 × 1 × 1 foot contains exactly 1 cubic foot.

Why Quikrete Yield Matters

Knowing the yield helps you:

Estimate material costs.
Avoid extra trips to the store.
Prevent project delays.
Reduce waste.
Calculate the number of bags required.

How Much Concrete Does Each Bag Make?

Different bag sizes are suited for different jobs.

40-Pound Bag

A 40-pound bag yields approximately 0.30 cubic feet of concrete.

Common uses include:

Small repairs
Mailbox posts
Minor patchwork

50-Pound Bag

A 50-pound bag yields approximately 0.37 cubic feet.

Typical projects:

Garden edging
Small footings
Sidewalk repairs

60-Pound Bag

A 60-pound bag yields approximately 0.45 cubic feet.

This size is often used for:

Fence posts
Deck supports
Medium-sized slabs

80-Pound Bag

An 80-pound bag produces approximately 0.60 cubic feet.

It is commonly used for:

Patios
Driveways
Larger construction projects

Because each bag covers more volume, contractors often prefer the 80-pound option.

How to Calculate the Number of Bags You Need

To estimate how many bags of Quikrete you need:

Step 1: Measure Your Project

Measure:

Length
Width
Depth

Step 2: Calculate the Volume

Multiply:

Length × Width × Depth

For example:

A slab measuring:

10 feet long
4 feet wide
4 inches thick

First, convert 4 inches to feet:

4 ÷ 12 = 0.33 feet

Now calculate:

10 × 4 × 0.33 = 13.2 cubic feet

Step 3: Divide by Bag Yield

If you use 80-pound bags:

13.2 ÷ 0.60 = 22 bags

You would need approximately 22 bags of Quikrete.

Common Quikrete Projects and Bag Requirements

The number of bags needed depends on the project.

Fence Posts

A standard fence post hole may require:

1–2 bags of 50-pound Quikrete.
1 bag of 80-pound Quikrete.

Sidewalks

A small sidewalk project often requires:

15–25 bags.

Concrete Slabs

A 10 × 10-foot slab that is 4 inches thick requires approximately:

56 bags of 60-pound Quikrete.
37 bags of 80-pound Quikrete.

Deck Footings

Deck supports generally require:

1–3 bags per footing.

Quikrete Bags Compared

Here is a side-by-side comparison.

Bag Size	Yield	Typical Use
40 lb	0.30 cu ft	Repairs
50 lb	0.37 cu ft	Posts
60 lb	0.45 cu ft	Footings
80 lb	0.60 cu ft	Slabs

Choosing the right bag size can save both time and effort.

Common Mistakes When Buying Concrete

Many people make avoidable mistakes when estimating concrete.

Forgetting to Convert Inches to Feet

Always convert thickness measurements before calculating volume.

Underestimating Waste

Concrete projects usually require extra material.

Most contractors recommend adding:

5–10% extra.

Buying the Wrong Bag Size

Larger bags reduce the number of bags you need but can be harder to carry.

Ignoring Project Shape

Round footings and post holes require different calculations than rectangular slabs.

Tips for Working With Quikrete

For the best results:

Read the bag instructions.
Use the recommended amount of water.
Mix thoroughly.
Wear gloves and safety glasses.
Work quickly before the mix begins to set.
Buy slightly more than you think you’ll need.

Proper preparation can make your project much easier.

Quikrete Bag Yield in Cubic Yards

Large projects are often measured in cubic yards.

Bag Size	Cubic Yards
40 lb	0.011 cu yd
50 lb	0.014 cu yd
60 lb	0.017 cu yd
80 lb	0.022 cu yd

One cubic yard equals 27 cubic feet.

FAQs

How many cubic feet are in an 80-pound bag of Quikrete?

An 80-pound bag yields approximately 0.60 cubic feet of concrete.

How many cubic feet are in a 60-pound bag of Quikrete?

A 60-pound bag produces about 0.45 cubic feet.

How many 80-pound bags make one cubic yard?

One cubic yard requires approximately 45 bags of 80-pound Quikrete.

How many bags of Quikrete do I need for a slab?

It depends on the slab dimensions and thickness. Measure the volume first and divide by the bag yield.

Is Quikrete the same as cement?

No. Quikrete is a ready-mix concrete product that contains cement, sand, and aggregate.

Conclusion

Now you know how many cubic feet are in a bag of Quikrete. Depending on the bag size, a single bag can yield anywhere from 0.30 to 0.60 cubic feet of concrete.

Before starting your next project, measure carefully, calculate the total volume, and buy a little extra material to avoid running short. Understanding Quikrete yields will help you complete your project efficiently and with confidence.