Hardscaping

Concrete Calculator

Estimate concrete for a slab, patio, footing pad or other rectangular pour. Enter the slab dimensions and thickness, then add a small allowance for grade variation, spillage and measurement error.

✓ Free✓ Instant result✓ No signup

Step 1

Enter project details

Slab length ft Slab width ft Concrete thickness in Extra / waste % Concrete yield per bag cu ft Optional ready-mix price $/yd³

Planning estimate only. Confirm local prices, supplier specifications and site conditions before ordering.

Step 2

Your estimate

Slab area—

Concrete volume—

Ready-mix volume—

Approx. bags—

Optional ready-mix cost—

Concrete yield, minimum delivery quantities and local ready-mix pricing vary. Verify the final order with the supplier, especially for structural or time-sensitive pours.

Optional next step

Request a local concrete project quote

Complete 3 quick steps to check local availability.

100% Free No Credit Card Required No Obligation to Hire

How it works

Tell us what you needAnswer a few quick project questions.
We check local availabilityMatching is based on your ZIP and project details.
Available providers may contact youCompare your options and decide what works for you.

1 Project 2 Details 3 Contact

Step 1 of 3

What kind of project is it?

Choose the service details and enter the five-digit project ZIP code.

Project scope Location ZIP code

Step 2 of 3

A few project details

Confirm who can authorize the work and add a short project description.

Can you authorize work on the property? How ready are you to hire? When would you like the project to start? Tell us briefly what you needOne or two short sentences is enough.

Step 3 of 3

Where can professionals reach you?

Use the contact details for the property where the project is planned. This usually takes about a minute.

Your request stays focused on this project

Your address helps check local service availability and is not posted publicly.
Submitting is free and does not require you to hire anyone.
Your details are used to process and route the home-service request described here.

First name Last name Project street addressEnter the property address. City and state are suggested automatically from the ZIP when available, and every field stays editable. City State PhoneU.S. phone number with area code. Email

✓ 100% Free ✓ No Credit Card Required ✓ No Obligation to Hire ✓ Consent Record Captured

Consent record powered by TrustedForm. Your consent session is independently recorded when you submit this request.

Notice at Collection: We use the information you provide to process and route this project request to participating service providers. Privacy Policy · Your Privacy Choices

How your information is used

Notice at Collection: ProjectMetrica collects the contact, project, device/source and consent information entered or generated with this request to provide contractor matching, document consent, prevent fraud and operate the service. If an eligible match is available, you direct us to disclose the request to participating service providers and platform partners, including WiserLeads/homeyou or Titan Lead Group, for the home-improvement project you selected. The consent session is independently recorded. See the Privacy Policy and Your Privacy Choices.

By submitting, you confirm that you are at least 18 years old and that the information you provided is accurate.

Your request may be sent to participating home-improvement providers when a qualifying match is available.

Before you order

Check local supplier specs

Density, bag coverage, pallet size and recommended installation depth can vary by material and supplier.

Professional installation

Start Matching

Connect with a local professional for a site-specific estimate.

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Formula & assumptions

How the concrete calculator works

Concrete volume = length × width × thickness. Thickness is converted from inches to feet, waste is applied, and cubic feet are converted to cubic yards. Bags = cubic feet ÷ bag yield.

For a better estimate

Measure the actual pour thickness rather than the excavation depth.
Concrete bag yields vary by bag weight and product, so use the yield printed on the bag.
Ready-mix orders may have minimum-load, short-load and delivery charges that are not included here.

Useful project tools

Tools that can help with this project

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases.

Finishing trowelFinish small concrete surfaces. View on Amazon → Mortar hoeMix bagged concrete for smaller pours. View on Amazon → Construction levelCheck forms, slope and grade. View on Amazon →

Common questions

Frequently asked questions

How many yards of concrete do I need?+

Multiply length by width by thickness in feet, then divide cubic feet by 27. Add a small allowance before ordering.

How many bags of concrete do I need?+

Divide the required cubic feet by the actual yield per bag. The calculator rounds bag quantities up to a whole bag.

Should I order extra concrete?+

A modest allowance can cover uneven subgrade, form variation and spillage. Large or structural pours should be verified carefully before ordering.

Enter project details

Your estimate

Request a local concrete project quote

What kind of project is it?

A few project details

Where can professionals reach you?

Check local supplier specs

Start Matching

How the concrete calculator works

For a better estimate

Tools that can help with this project

Frequently asked questions

Guides for this project

How Much Concrete Do I Need?

Concrete Cost per Yard

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