How do you measure countertop square footage?
Break the counter into rectangles — one per straight run — and measure each one's length and depth. Multiply length × depth for each piece, add them together, and you have the total area. A standard kitchen counter is 25 inches (63.5 cm) deep, and an island can be wider, so measure rather than assume. The calculator above lets you enter each section separately and sums them for you, in both square feet and square metres.
How much material should I order for waste?
Always add a waste allowance on top of your measured area. Stone fabricators typically add 10–20% to cover the saw kerf, sink and cooktop cutouts, edge profiles, and the odd bad cut or veining match on natural stone. For a simple layout 10% is usually enough; for lots of cutouts, an L- or U-shape, or a busy marble you want book-matched, lean toward 15–20%. The calculator adds a configurable margin so your order isn't short.
How are countertops actually priced?
Stone is sold by the square foot (or square metre) of finished counter, and the price bundles the slab, fabrication (cutting, polishing, edge profile) and installation. That is why quotes vary so much: quartz and mid-range granite are usually the most affordable per square foot, exotic marble and quartzite the priciest, and the edge profile, number of cutouts and seams all add to labour. Knowing your area is the first step to a quote you can sanity-check.
Do I include the backsplash and overhang?
Include anything that will be cut from stone. Count the front overhang (usually about 1–1.5 inches past the cabinet) in your depth, and if you want a stone backsplash measure it as its own section (length × height) and add it in. A raised bar or waterfall edge is extra stone too. Leaving these out is the most common reason a home measurement comes in under the fabricator's.
Reference tool. Depths and waste allowances are typical values; confirm the final area and price with your fabricator before ordering.
Frequently asked questions
How do I calculate countertop square footage?
Split the counter into rectangles, multiply each one's length by its depth, and add them up. A typical counter is 25 in (63.5 cm) deep. Then add 10–20% for waste and cutouts.
How much extra should I add for waste?
10–20%. Use about 10% for a simple straight run and 15–20% for L/U-shapes, many cutouts, or a natural stone you want vein-matched.
How many square feet is an average kitchen countertop?
Most kitchens land around 30–50 sq ft (2.8–4.6 m²) of counter, plus another 6–20 sq ft if there's an island. Yours depends entirely on your layout — measure each run.
Is marble, granite or quartz measured differently?
No — area is measured the same way for all of them. The difference is price per square foot and how much waste you allow: natural stones like marble and quartzite often need a bigger margin for vein matching than engineered quartz.
Should the backsplash be included in the area?
Only if it will be made of the same stone. Measure a stone backsplash as its own rectangle (length × height) and add it; a tile backsplash is calculated separately.