Countertop Calculator
Calculate countertop square footage for standard counters, islands, L-shape, and U-shape kitchens. Includes backsplash area, edge linear feet, and material cost estimate for laminate, granite, quartz, marble, and butcher block.
ft
ft
Counter Area (sq ft)
—
Net Area (after cutouts) —
Edge Linear Feet —
Extended More scenarios, charts & detailed breakdown ▾
ft
in
Counter Area (sq ft)
—
Backsplash Area (sq ft) —
Edge Linear Feet —
Professional Full parameters & maximum detail ▾
ft
ft
in
Area Breakdown
Gross Counter Area (sq ft) —
Net Area (sq ft) —
Backsplash Area (sq ft) —
Front Edge (lin ft) —
Cost & Material
Est. Material Cost (mid) —
Material Note —
How to Use This Calculator
- Enter the counter length in feet and depth (default 2.08 ft = 25 in).
- Enter the number of sink cutouts to deduct (~4 sq ft each).
- Use Extended tabs for islands and L/U-shape kitchens. Switch to Professional for material cost estimates.
Formula
Gross Area = Length × Depth
Net Area = Gross Area − (Sinks × 4 sq ft)
Backsplash = Length × (Height_in ÷ 12)
Example
Example: 10 ft counter, 25 in deep, 1 sink → 10 × 2.08 = 20.8 sq ft − 4 = 16.8 sq ft net. At $85/sq ft quartz = $1,428 material cost.
Frequently Asked Questions
- Multiply the counter length by the depth (typically 25 inches = 2.08 ft for standard counters). Subtract about 4 sq ft per sink cutout.
- Standard kitchen countertops are 25 inches deep (including a 1-inch overhang over 24-inch base cabinets). Island countertops are often 36–48 inches wide.
- Granite countertops typically cost $40–$100 per square foot installed. Quartz runs $50–$120/sq ft. Laminate is the most affordable at $20–$50/sq ft.
- Not always — backsplash is often a separate material. However, a 4-inch matching stone backsplash is typically fabricated from the same slab. The calculator shows backsplash area separately.
- For runs longer than 8–10 feet, stone countertops require seams where two slabs meet. Seam placement should be agreed on with the fabricator before templating.
Related Calculators
Sources & References (5) ▾
- NKBA Kitchen & Bath Planning Guidelines — National Kitchen & Bath Association
- HomeAdvisor Countertop Installation Cost Guide — HomeAdvisor
- Marble Institute of America – Stone Care & Maintenance — Marble Institute of America
- Quartz Surfaces – MIA+BSI Fabrication Guide — MIA+BSI
- Houzz Kitchen Countertops Cost Guide — Houzz