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 three short steps to check for available local professionals.

Free to submit No purchase required

How matching works

ProjectMetrica helps route your concrete flatwork request to participating platform partners or service providers when an eligible match is available.

Availability depends on ZIP code, service and project details.
ProjectMetrica is not the contractor and may receive compensation for an accepted request.

ProjectMetrica collects this request and may share it with participating service providers and platform partners for the home-improvement project you selected. The consent session is independently recorded. See the Privacy Policy.

1 Project 2 Timing 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

When are you planning the work?

These details help make the request more relevant. No availability check is sent yet.

Hiring status Project timeframe Can you authorize work on the property? Project details

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 street address where the work is planned. You can correct every address field before submitting. City State Phone Email

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

Compare local project quotes

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

Get free quotes →

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?

When are you planning the work?

Where can professionals reach you?

Check local supplier specs

Compare local project quotes

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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