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Countertop Square Footage Calculator
Calculate kitchen and bathroom countertop area, backsplash, material cost, and slab requirements
📐 Standard US countertop depth: 25.5 inches | Include backsplash and overhang in measurements
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Total Square Feet
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With Waste (sq ft)
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Material Cost
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Edge Profile Cost
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Standard Slabs Needed (55×110″)
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Total Project Estimate
| Section | Length (in) | Depth (in) | Area (sq ft) |
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Calculate countertop square feet for granite, quartz, marble — fast, free, no signup
How to Calculate Countertop Square Footage
To calculate countertop square feet, multiply the length by the depth (in inches), then divide by 144. For multiple sections, add each area together. Include backsplashes, overhangs, and account for waste (typically 5-10%).
Formula: (Length in inches × Depth in inches) ÷ 144 = Square Feet
Standard depth: 25.5 inches (for base cabinets with 1.5″ overhang)
Countertop Pricing Factors
- Material: Granite ($40-100/sq ft), Quartz ($50-120/sq ft), Marble ($40-150/sq ft)
- Fabrication & Installation: Typically $30-60 per square foot
- Edge Profiles: Standard eased edge included, premium edges add $10-25 per linear foot
- Cutouts: Sink and cooktop cutouts may have additional fees
- Slab Size: Standard slabs are 55″×110″ (~42 sq ft) or 65″×130″ (~59 sq ft)
Countertop Measurement Tips
- 📏 Measure each section separately, including L-shaped and U-shaped kitchens
- 🔲 Include sink cutouts and cooktop openings in total measurement
- 📐 Account for overhang (standard is 1.5 inches on front edge)
- 🧱 Backsplash: Add 4 inches of height × total length for standard backsplash
- ⚠️ Order 5-10% extra material for cuts, seams, and waste
Frequently Asked Questions
- What is the standard countertop depth? — Standard base cabinet depth is 24 inches, with a 1.5-inch overhang, making total depth 25.5 inches.
- Do I need to include backsplash in square footage? — Yes, backsplash is typically calculated separately at 4 inches height × total linear footage.
- How much waste should I account for? — Industry standard is 5-10% for straight cuts, 15-20% for complex layouts with multiple seams.
- What is the average countertop square footage for a kitchen? — Typical kitchen ranges from 30 to 60 square feet depending on layout and island.
- How many slabs do I need? — Standard slabs are about 42 sq ft (55″×110″). Divide total square footage by 35-40 to account for layout efficiency.