How to Measure Your Countertops
Break your countertop area into separate rectangles. Measure the length and width of each rectangle — islands, peninsulas, and L-shaped sections included. Enter your measurements into the calculator above. Cutouts for sinks or cooktops do not affect square footage.
Why Accurate Measurements Matter
- Estimate material needs and reduce waste.
- Get realistic cost estimates for granite, quartz, marble, and quartzite.
- Plan for overhangs and islands accurately.
- Avoid unexpected costs during installation.
Know your Square Footage?
Use our Instant Countertop Estimator to show an instant price for your custom CountertopsFrequently Asked Questions
How do I use the countertop calculator?
Measure your countertop in rectangles, enter lengths and widths into the calculator, and get an instant square footage and cost estimate.
Is this calculator free?
Yes — always free for homeowners and contractors alike.
Which materials are supported?
Granite, quartz, marble, and quartzite countertops are all supported.
AL, IL Granite 60664 Countertop Estimate
AL, IA Quartz 52212 Countertop Estimate
AL, NJ Custom 07628 Countertop Estimate
NH, Marble Countertop Estimate
AL, FL Granite 32953 Countertop Estimate
FL, SC Quartz 29009 Countertop Estimate
AZ, Custom Countertop Estimate
US, Marble Countertop Estimate
US, Granite Countertop Estimate
US, Quartz Countertop Estimate
US, Custom Countertop Estimate
KS, Marble Countertop Estimate
Trusted by Thousands of Homeowners
“This countertop calculator saved me time and money — highly recommend!” — F. Chiamero
“Accurate and easy to use. Helped us plan our kitchen perfectly.” — T. Jones
How Countertops are calculated
Countertops are calculated based on total surface area, material type, edge profiles, cutouts, and installation factors. Measurements are taken in square feet from cabinet layouts, including seams, backsplashes, sink and cooktop cutouts, and overhangs. Pricing is then adjusted based on material selection (granite, quartz, marble, quartzite, etc.), fabrication complexity, edge details, and installation requirements. A proper countertop estimate combines layout measurements with fabrication and installation variables to produce an accurate cost range.The formula to calculate countertops is Length (inches) X width (inches) / 144 = Square footage.
This is rather simple but can get more complex as you start to measure more than one area.Let's take a typical bathroom vanity.
36" length X 24" width = 846
Now add 4" backsplash which is
36" length X4" width = 144
The total square inches = 990
990 / 144 = 6.875 square Feet ...
Round this up to 7 for a typical small bathroom vanity.
The countertop square foot calculator helps you manage the measurement, the rooms and in many cases provides a local countertop professional to review the project size and answer any questions you may have.
