How Much to Add Quartz Countertop

Installing a quartz countertop can transform the look and feel of your kitchen or bathroom. However, determining how much quartz to purchase for your countertop installation can be confusing. Here is a comprehensive guide on how to calculate the right amount of quartz needed for your next countertop project.

Measure the Area to be Covered

The first step is to accurately measure the length and width of the countertop area where the quartz will be installed. Make sure to write down the measurements in inches or centimeters. Measure along the wall edges and around any corners or irregular shapes.

For a straightforward rectangular countertop, simply multiply the length by the width to get the square footage. For an L-shaped countertop, measure and calculate the square footage for each segment separately, then add them together.

Round up to the nearest foot or use decimal points for the most precise measurement possible. Having accurate dimensions is crucial for determining the quartz slab size and quantities required.

Account for Seams and Overhangs

When calculating how much quartz you need, be sure to account for any seams and overhangs in your design.

Seams are necessary when joining multiple slabs to cover large countertop spans. Add 1 inch per seam to your measurements to allow for the space between slabs.

Overhangs are when the countertop extends past the edge of the cabinets. Standard overhang is 1 inch on each side. Measure and add any overhang inches to your total.

For example, a 10 ft long countertop with a 1 inch overhang on each end would require you to purchase enough quartz for a 10 ft 4 inch span.

Determine Thickness and Allow for Cutouts

Quartz slabs are available in standard thicknesses of 3/4 inch or 1 1/4 inches. Confirm the thickness needed for your project.

Also, account for any cutouts or holes that will be made in the countertop for sinks, faucets, and appliances. Add a few extra inches around each cutout to be safe.

For instance, if you are installing a sink that measures 25 inches wide by 20 inches deep, add an extra 2 inches all around for a 29 inch by 24 inch cutout section.

Establish the Slab Width

Quartz slabs typically come in widths of 55 inches, 65 inches or 120 inches.

To minimize seams, calculate how many slabs you will need at the available width.

For example, a 10-foot countertop will require two 5-foot wide slabs rather than three or more narrower slabs.

Consult with your fabricator or supplier to verify slab sizes for exact planning.

Calculate Total Square Footage

Add together the square footage measurements from all your countertop sections.

Be sure to include overhangs, seams, thickness, and cutouts.

Round up to the nearest whole foot for a small buffer.

Order 10-15% Extra Material

Once you have your total square footage amount, order 10-15% extra material to be safe.

The extra quartz allows for potential cracks, fractures, or errors during fabrication and installation. Leftover slabs can be repurposed for backsplashes or other projects.

Ordering a bit extra reduces the risk of coming up short, which would incur delays and additional costs.

Factors that Affect Quartz Countertop Cost

  • Slab Size – Larger slabs tend to cost less per square foot
  • Thickness – 3/4 inch is less expensive than 1 1/4 inch
  • Color – Neutrals like whites and grays are typically cheaper than bold colors
  • Finishes – Polished finishes are more affordable than textured options
  • Fabrication – Complex designs require more labor and expense
  • Transportation – Shipping and delivery costs may apply

Aim for the most economical options that still provide your desired aesthetic. Get an estimate of total installed costs before finalizing your order.

How Much Does Quartz Countertop Installation Typically Cost?

On average, expect to pay $80 to $140 per square foot for materials, fabrication, and professional installation of a quartz countertop. The total cost is influenced by the factors listed above.

Luxury designer brands can range from $200 to over $300 per square foot installed. On the lower end, discounted quartz can cost as little as $50 per square foot.

Get multiple quotes to find the best combination of quality, materials, and affordability for your specific kitchen or bath.


How do you calculate square footage for a quartz countertop?

Measure length x width for each section, adding any overhangs and seams. Round up to the full inch. Add together areas for total square footage.

What size quartz slabs are available?

Standard slab dimensions are 55″, 65″, and 120″ wide. Lengths vary. Check with your supplier for exact sizing options.

How much overhang should I allow for a quartz countertop?

A 1″ overhang on each exposed edge is typical. For support and minimal seams, don’t exceed a 3-4″ overhang.

What thickness quartz countertop should I get?

3/4″ thickness is sufficient for most home kitchens. Select 1 1/4″ thickness for a sturdier surface in commercial settings.

Can quartz countertops be installed DIY?

Quartz is very heavy, so professional installation is strongly advised. DIY risks cracks, uneven seams, and other errors.


When calculating how much quartz you need for new countertops, carefully measure each section and account for overhangs, seams, thickness, and cutouts. Order 10-15% extra material to be safe. Consult fabrication specialists to ensure you purchase the optimal amount of quartz for a seamless installation. With some planning and math, you can get a beautiful new quartz countertop designed to perfectly fit your space.