It sounds like a simple question until you have several footing shapes, different dimensions, multiple locations, reinforcement, waste, and delivery costs to consider. A small mistake in the volume calculation can leave you short during a concrete pour—or leave you paying for more concrete than the project requires.

Our Concrete Footings Calculator makes this process much easier. Enter your footing dimensions, select the footing type, specify the number of footings, and provide a few project details. The calculator then estimates the total concrete requirement and converts it into useful measurements such as cubic yards, cubic feet, and cubic meters.

It also goes beyond basic volume. You can get estimates for ready-mix truck loads, 60 lb bags, 80 lb bags, reinforcement, concrete cost, delivery fees, and total project cost.

Whether you're planning deck footings, foundation work, a garage, porch, addition, pier-supported construction, or another project involving concrete footings, this calculator can help you build a more useful preliminary material estimate.

Why Concrete Footing Estimates Are More Complicated Than They Look

A footing may look like nothing more than a block of concrete, but construction projects rarely involve just one simple block.

You might have:

• Four square footings for a deck
• Several round footings for posts
• A long continuous footing beneath a wall
• A pier with a wider base
• Different quantities of concrete at different locations
• Reinforcement requirements
• Excavation that is slightly larger than the planned dimensions

Calculating each volume manually can become repetitive. You also have to convert cubic feet to cubic yards, account for waste, estimate truck requirements, and work out approximate material costs.

That's where a dedicated footing calculator becomes useful.

Instead of handling each calculation separately, you can enter the project information in one place and review the resulting estimate.

What Types of Footings Can You Calculate?

The calculator supports five common footing configurations.

Rectangular Footings

For rectangular footings, enter:

• Length
• Width
• Depth or thickness

This is useful for conventional rectangular foundation pads and similar footing designs.

Square Footings

Square footings require:

• Side length
• Depth or thickness

Because the length and width are equal, only one horizontal measurement is necessary.

Round or Circular Footings

For circular footings, enter:

• Diameter
• Depth or thickness

The calculator uses the circular dimensions to determine the volume.

Wall Footings

Continuous wall footings require:

• Total wall length
• Footing width
• Footing depth

Instead of calculating many individual sections, you can enter the overall length of the continuous footing.

Pier Footings

Pier footings are slightly more involved because they can include both a vertical pier and an enlarged base.

The calculator asks for:

• Pier diameter
• Pier depth
• Base diameter
• Base depth

It then combines the pier and base volumes to produce the estimated concrete requirement.

How to Use the Concrete Footings Calculator

Using the calculator is straightforward, but entering accurate measurements is important.

Step 1: Choose the Footing Style

Start by selecting the footing shape that matches your project.

Choose between rectangular, square, round/circular, wall, or pier footing.

The calculator automatically presents the dimensions relevant to the selected type.

For example, selecting a rectangular footing gives you fields for length, width, and depth, while selecting a round footing gives you diameter and depth.

Step 2: Enter Your Dimensions

Measure the footing dimensions from your plans or project specifications.

For a rectangular footing, enter the length, width, and depth.

For a square footing, enter the side length and depth.

For a circular footing, enter the diameter and depth.

Make sure the measurements are entered consistently. Don't mix feet and meters within the same calculation.

Step 3: Select the Unit System

The calculator supports:

• Feet and inches
• Meters
• Yards

Choose the measurement system that matches the dimensions you're entering.

The calculator converts the volume into cubic feet before producing its final material estimates.

Step 4: Enter the Number of Footings

If you're calculating individual footings, enter the total quantity.

For example, if your project has 12 identical square footings, enter 12.

The calculator multiplies the volume of one footing by the number of footings.

For a continuous wall footing, the calculator uses the total wall length instead, so the quantity is treated as one continuous footing.

Step 5: Select Concrete Strength

You can select from four concrete strength options:

• 2500 PSI
• 3000 PSI
• 3500 PSI
• 4000 PSI

The selected strength affects the calculator's built-in concrete price estimate.

The correct concrete strength for an actual structure should come from the project specifications, plans, applicable requirements, or qualified professional guidance.

Step 6: Choose Reinforcement

The calculator allows you to select:

• No reinforcement
• #4 rebar grid
• Fiber mesh
• Both rebar and fiber

This provides an estimated reinforcement quantity and cost for preliminary budgeting.

However, actual reinforcement requirements should be based on the structural requirements of your project.

Step 7: Enter Waste and Overfill

The calculator includes a waste and overfill percentage between 0% and 30%.

The default is 10%.

This is important because theoretical footing dimensions don't always match the amount of concrete used in the field.

Excavation may be slightly oversized, soil can fall away from excavation walls, and some concrete may be lost during placement.

Step 8: Enter Delivery Distance

Enter the approximate concrete delivery distance in miles.

The calculator uses this information to estimate the delivery fee and include it in the total project cost.

Step 9: Click Calculate

After entering all the required information, click Calculate.

The calculator displays your estimated concrete quantity, truck loads, bags, reinforcement, and costs.

A Simple Concrete Footing Calculation Example

Let's say you have four square footings.

Each footing is:

• 3 feet long
• 3 feet wide
• 1 foot deep

The volume of one footing is:

3 × 3 × 1 = 9 cubic feet

For four footings:

9 × 4 = 36 cubic feet

Because one cubic yard equals 27 cubic feet:

36 ÷ 27 = 1.33 cubic yards

Now add the calculator's default 10% waste allowance:

1.33 × 1.10 = approximately 1.47 cubic yards

So the adjusted estimate is approximately 1.47 cubic yards of concrete.

This example demonstrates why the waste percentage matters. The theoretical volume and the amount you may need to plan for are not necessarily identical.

Example: Calculating a Round Footing

Suppose you need a circular footing with a diameter of 4 feet and a depth of 1 foot.

First, divide the diameter by two to find the radius:

4 ÷ 2 = 2 feet

The circular footing volume is calculated using the circle area multiplied by depth:

π × 2² × 1 = approximately 12.57 cubic feet

Convert that to cubic yards:

12.57 ÷ 27 = approximately 0.47 cubic yards

If you have multiple identical circular footings, the calculator multiplies the individual volume by the number of footings before applying the selected waste percentage.

Example: Continuous Wall Footing

Continuous footings require a slightly different approach.

Suppose a wall footing is:

• 40 feet long
• 2 feet wide
• 0.75 feet deep

The volume is:

40 × 2 × 0.75 = 60 cubic feet

Convert the result to cubic yards:

60 ÷ 27 = approximately 2.22 cubic yards

With a 10% allowance:

2.22 × 1.10 = approximately 2.44 cubic yards

For this type of calculation, enter the total wall length rather than treating every section as an individual footing.

How Much Concrete Do You Need Per Footing?

The answer depends entirely on the dimensions.

A 2 × 2 × 1 foot footing contains:

4 cubic feet

A 3 × 3 × 1 foot footing contains:

9 cubic feet

A 4 × 4 × 1 foot footing contains:

16 cubic feet

As the dimensions increase, concrete volume can increase quickly.

That's why using the exact dimensions from the project plans is much more reliable than estimating based on appearance or comparing the footing to another project.

Understanding Cubic Yards

Ready-mix concrete is commonly purchased by the cubic yard.

One cubic yard equals:

27 cubic feet

For example:

• 27 cubic feet = 1 cubic yard
• 54 cubic feet = 2 cubic yards
• 81 cubic feet = 3 cubic yards

The calculator automatically converts the calculated volume into cubic yards so you can use the result when discussing an estimated order with a concrete supplier.

How Many Ready-Mix Trucks Might You Need?

The calculator estimates truck loads using a 10-cubic-yard capacity assumption.

Suppose the adjusted project requirement is 18.2 cubic yards.

The calculation is:

18.2 ÷ 10 = 1.82

The calculator rounds this up to:

2 truck loads

This is a planning estimate. Actual ready-mix truck capacities and supplier requirements can vary, so confirm the final order quantity directly with your supplier.

Concrete Bag Estimates

The calculator also provides estimated quantities for:

• 60 lb concrete bags
• 80 lb concrete bags

This can be helpful when you're comparing bagged concrete with ready-mix delivery.

However, bagged concrete products can have different yields. The actual number of bags needed depends on the manufacturer's stated yield for the specific product you're purchasing.

For larger footing projects, handling hundreds of bags may also be considerably more labor-intensive than ordering ready-mix.

Understanding the Concrete Cost Estimate

The calculator uses predefined concrete prices based on the selected strength.

Its built-in assumptions are:

Concrete Strength	Estimated Price
2500 PSI	$120 per cubic yard
3000 PSI	$125 per cubic yard
3500 PSI	$135 per cubic yard
4000 PSI	$145 per cubic yard

These figures are for estimation purposes only.

Actual concrete prices can vary based on your location, supplier, mix specifications, order quantity, market conditions, taxes, fuel charges, and other factors.

For an actual purchase, obtain a current quotation from a local supplier.

How the Delivery Estimate Works

The calculator uses a base delivery fee of $60.

For delivery distances above 10 miles, it adds $2.50 per additional mile.

For example, with an 18-mile delivery distance:

• Base delivery fee = $60
• Additional distance = 8 miles
• Distance charge = 8 × $2.50 = $20
• Estimated delivery = $80

This is the calculator's built-in pricing model and may not match the quote from your supplier.

Understanding the Reinforcement Estimate

The reinforcement section provides an estimate based on the option you select.

For the #4 rebar option, the calculator assumes:

4 pieces per footing × 10 feet per piece

For fiber mesh, it assumes:

1.5 bags per cubic yard

The calculator also includes built-in reinforcement prices for estimating the project cost.

These numbers should not be treated as a structural reinforcement specification. Actual rebar size, spacing, placement, concrete cover, and fiber requirements can vary according to the project.

Why Add a Waste Allowance?

Concrete volume calculations are mathematical. Construction sites aren't.

An excavation may be slightly wider or deeper than planned. The sides of an excavation may collapse. Uneven soil can create additional space that needs to be filled.

There can also be small placement losses.

For this reason, the calculator lets you adjust the waste and overfill allowance from 0% to 30%.

The default setting is 10%, but the appropriate allowance depends on your project and site conditions.

Common Mistakes When Estimating Footing Concrete

Forgetting the footing depth

People often focus on length and width while overlooking depth. Even a relatively small increase in depth can significantly change the total volume.

Using the wrong footing shape

A circular footing cannot be calculated using the same formula as a rectangular footing.

Make sure the selected footing style matches the actual design.

Forgetting multiple footings

If one footing requires 0.5 cubic yards and the project has eight identical footings, the project doesn't require 0.5 cubic yards—it requires approximately four cubic yards before any waste allowance.

Ignoring waste

Theoretical volume doesn't always equal actual consumption.

Assuming calculator prices are local prices

The built-in prices are estimates. Always obtain a current supplier quotation before ordering.

Treating the calculator as structural engineering

A calculator can estimate material quantities. It cannot determine whether a footing is structurally appropriate for your building, soil, loads, or local requirements.

When Is This Calculator Most Useful?

The calculator can be useful for preliminary planning for:

• Deck footings
• Porch foundations
• Garage projects
• Foundation work
• Addition projects
• Post-supported structures
• Pier foundations
• Continuous wall footings
• Small construction projects
• Material budgeting
• Concrete ordering preparation

It's particularly useful when you want to go from footing dimensions to a practical purchasing estimate without doing several separate calculations.

Before Ordering Your Concrete

Before placing an actual order, review your results carefully.

Confirm the footing dimensions against your project plans. Verify the required concrete strength. Check reinforcement requirements. Review the excavation conditions and waste allowance.

Then contact your concrete supplier to confirm:

• Current concrete price
• Available concrete strength
• Truck capacity
• Minimum order requirements
• Delivery fee
• Delivery distance charges
• Scheduling
• Any additional supplier fees

The calculator is a planning tool, so the final order should be based on verified project information and the supplier's current quotation.

Frequently Asked Questions

1. What does a concrete footings calculator do?

It estimates the amount of concrete required for different footing shapes and can also provide estimates for truck loads, bags, reinforcement, delivery, and project costs.

2. What information do I need to calculate concrete footings?

You generally need the footing type, dimensions, quantity, unit system, waste allowance, and other project options such as concrete strength and reinforcement.

3. How do I calculate concrete for a rectangular footing?

Multiply the length by the width and depth to determine the basic volume. The calculator then converts the result into cubic yards and other units.

4. How many cubic feet are in one cubic yard?

There are 27 cubic feet in one cubic yard.

5. Can I calculate several footings at once?

Yes. Enter the total number of individual footings, and the calculator multiplies the volume of one footing by the specified quantity.

6. Can I calculate a circular concrete footing?

Yes. Select the round/circular footing option and enter its diameter and depth.

7. Can I calculate continuous wall footings?

Yes. Select the wall footing option and enter the total wall length, footing width, and depth.

8. Does the calculator support pier footings?

Yes. You can enter the pier diameter, pier depth, base diameter, and base depth.

9. Why does the calculator add waste?

Waste and overfill account for possible differences between theoretical dimensions and actual concrete consumption during excavation and placement.

10. What waste percentage should I use?

The calculator allows between 0% and 30%, with 10% as the default. The appropriate percentage depends on site conditions and the accuracy of the excavation.

11. How does the calculator estimate ready-mix trucks?

It assumes each truck carries 10 cubic yards and rounds the required number of truck loads upward.

12. Does it calculate the number of concrete bags?

Yes. It provides estimates for both 60 lb and 80 lb bags.

13. Does concrete strength affect the estimated cost?

Yes. The calculator uses different built-in prices for 2500, 3000, 3500, and 4000 PSI concrete.

14. Does the calculator determine the correct footing size?

No. It estimates material quantities based on the dimensions you provide. Footing dimensions should come from the appropriate project plans and requirements.

15. Can I use the calculator's total cost as an exact project price?

No. The cost is an estimate based on the calculator's built-in assumptions. Actual concrete, reinforcement, and delivery prices vary dimensions, allow for realistic site conditions, and verify the final quantities and specifications before ordering. For structural decisions, always rely on the applicable project plans and qualified professionals by supplier, location, project requirements, and current market conditions.

Final Thoughts

Estimating concrete for footings doesn't have to involve a stack of separate calculations.

The Concrete Footings Calculator brings the main parts of the estimate together. Whether you're working with square pads, rectangular footings, circular footings, continuous wall footings, or pier bases, you can enter your dimensions and quickly see the estimated concrete volume.

More importantly, the calculator helps translate that volume into numbers that are easier to use for project planning: cubic yards, cubic feet, cubic meters, truck loads, concrete bags, reinforcement, delivery costs, and an estimated total project cost.

Use accurate dimensions, allow for realistic site conditions, and verify the final quantities and specifications before ordering. For structural decisions, always rely on the applicable project plans and qualified professionals rather than using a material calculator as a substitute for engineering.