Countertop Inches to Square Feet Calculator

Enter Countertop Measurements

Use inches for all measurements. Use zero for any field that does not apply.

Section A Length

Section A Depth

Section B Length

Section B Depth

Section C Length

Section C Depth

Overlap Length Deduction

Overlap Depth Deduction

Backsplash Length

Backsplash Height

Exposed Edge Length

Extra Overhang Depth

Cutout Length

Cutout Width

Cutout Quantity

Waste Percentage

Square Feet Per Slab

Material Price Per Sq Ft

Labor Price Per Sq Ft

Finished Edge Price Per Ft

Fixed Project Fee

Formula Used

Section area: length × depth

Backsplash area: backsplash length × backsplash height

Overhang area: exposed edge length × extra overhang depth

Cutout deduction: cutout length × cutout width × quantity

Net square inches: sections + backsplash + overhang - overlap - cutouts

Square feet: net square inches ÷ 144

Total required area: square feet + waste allowance

Estimated cost: material + labor + edge finishing + fixed fee

How to Use This Calculator

Measure each countertop run in inches.
Enter the main run as Section A.
Add extra runs as Section B and Section C.
Use overlap fields when two rectangles share a corner.
Add backsplash, overhang, cutout, and waste details.
Enter slab size and price values for a cost estimate.
Press the calculate button to view the result.
Use the CSV or PDF button to save the report.

Example Data Table

Project Type	Length	Depth	Waste	Approx Area
Small vanity top	48 in	22 in	10%	8.07 sq ft
Kitchen straight run	120 in	25.5 in	10%	23.38 sq ft
Island countertop	84 in	42 in	12%	27.44 sq ft
L shaped layout	120 in + 72 in	25.5 in	12%	38.08 sq ft

Planning Countertop Area

Countertop work starts with careful measurements. Many sketches list lengths and depths in inches. Fabricators, stores, and cost guides often use square feet. This calculator joins both needs. It converts inch based sections into a project area. It also adds backsplashes, overhangs, waste, cutouts, slab coverage, edging, labor, and fixed charges.

Why Square Feet Matter

Square feet help compare material quotes. Granite, quartz, laminate, butcher block, and solid surface products are usually priced by area. A small measuring error can change the budget. An island with a wider overhang may need more material. A sink cutout may reduce visible area, but it still affects fabrication work. Waste is also important. Corners, seams, grain direction, and trimming often need extra material.

Countertop Measuring Tips

Measure each straight section separately. Use the longest length and full depth. For L shaped plans, enter one run as section A. Enter the second run as section B. Use overlap fields when both rectangles cover the same corner. For a U shaped plan, use section C for the third run. Add backsplash height and length when it is made from the same material. Add exposed edge length for overhang and edge finishing. This gives a more complete estimate than a simple rectangle calculation.

Using Estimates Wisely

The result is a planning estimate. It is not a final fabrication drawing. Real jobs may need templates, seam planning, corner radius details, appliance gaps, support brackets, and installer rules. Always round up before ordering slabs. Review the extra slab coverage value. It shows how much material remains after the calculated need. This helps you compare slab sizes and reduce waste.

Better Project Decisions

This tool can also support quick budget tests. Change the waste percentage to see conservative and tight estimates. Adjust material price, labor rate, edge price, and fixed fees. Then compare totals before choosing a surface. Save the report as a PDF for clients, suppliers, or your own project folder. Download the CSV when you want to check numbers in a spreadsheet. Clear measurements create clearer choices. Keep supplier rules nearby when you compare final quote details. Ask installers about seams before placing orders.

FAQs

How do I convert inches to square feet?

Multiply length by depth to get square inches. Then divide square inches by 144. The calculator does this automatically and can include waste, backsplash, overhang, and cutout adjustments.

Why is 144 used in the formula?

One square foot contains 12 inches by 12 inches. That equals 144 square inches. Dividing square inches by 144 converts the area into square feet.

Can I calculate an L shaped countertop?

Yes. Enter one run as Section A and the other run as Section B. If both rectangles overlap at the corner, enter the overlap length and depth to avoid double counting.

Can I include a backsplash?

Yes. Enter the backsplash length and height in inches. The calculator adds that area to the main countertop area before applying the waste percentage.

Should sink cutouts be deducted?

You can deduct cutout area for planning. However, some fabricators still charge for fabrication work around cutouts. Use the final result as an estimate, not a final quote.

What waste percentage should I use?

Many countertop estimates use 10% to 15% waste. Complex layouts, seams, veining, and slab matching may need more. Ask your supplier before ordering material.

How are slabs estimated?

The calculator divides total square feet by square feet per slab. It then rounds up to the next whole slab because partial slabs are not normally purchased as exact fractions.

Is this a final contractor estimate?

No. This tool gives a planning estimate. Final pricing may depend on templates, seam placement, edge profiles, delivery, installation, cutouts, supports, and supplier policies.