Countertop Calculator
Estimate countertop square footage and cost
Sum of all counter run lengths
Standard: 25.5" (with overhang)
Affects price per sq ft
Total Area
—
sq ft
Slabs Needed
—
slabs
Material Cost
—
USD
With Installation
—
USD
Disclaimer: Results are estimates based on standard formulas. Not a substitute for professional advice from a licensed contractor, engineer, or architect. Verify all calculations before making purchasing or construction decisions.
How to Use This Calculator
Our calculator estimates square footage and total cost based on counter dimensions and material choice.
- Measure total length of all counter runs
- Use standard 25.5" depth
- Select countertop material
- Enter specifications
- Factor in sink cutouts (deduct 3-5 sq ft each)
Expert Insights
Smart analysis for your Kitchen & Bath project
Countertop Material Guide
Granite: $40-100/sqft, needs yearly sealing. Quartz: $50-120/sqft, zero maintenance. AI compares 10-year cost including maintenance.
Waterproofing Requirements
Tile and grout are NOT waterproof. AI flags the need for waterproof membrane behind shower walls — the #1 source of shower failures.
Standard Dimension Guide
Counter height: 36". Overhang: 1-1.5". Backsplash: 18-20". AI validates your measurements against standard dimensions.
Calculation Formula
Area = Length x (Depth / 12)
Slabs = Area / 45 (standard slab ~45 sq ft)
Cost = Area x Price per sq ft
Frequently Asked Questions
How much do quartz countertops cost?
$50-$120 per sq ft installed. A typical 30 sq ft kitchen costs $1,500-$3,600 for quartz.
Is granite or quartz better?
Quartz is non-porous and more durable. Granite is natural stone with unique patterns but requires annual sealing.