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General Measurement & Area ★★★★★ Verified Tool

Square Footage Calculator

Calculate total surface area for rooms, countertops, walls & floor plans with waste margin.

⚙️ Enter Project Parameters

ft
ft
%
📊 Calculation Results LIVE ESTIMATE
0
Total Gross Square Feet

📐 Mathematical Formula & Standard

Area (sq ft) = Length (ft) × Width (ft)
Gross Area = Net Area × (1 + Waste% / 100)
Square Yards = Sq Ft ÷ 9

📖 Comprehensive Guide & Pro Estimating Tips

Calculating accurate square footage is the foundational step for any home renovation, stone countertop installation, flooring project, or paint estimate.

How to Measure Complex Rooms

For L-shaped or irregular rooms, divide the floor plan into separate rectangular sections. Measure each section independently, calculate the individual square footage, and sum them together before applying your project waste factor (typically 5% to 15%).

❓ Frequently Asked Questions

How do I calculate square feet from inches?
Multiply length in inches by width in inches, then divide the result by 144 to get square feet.
What is a standard waste margin for square footage?
Most contractors recommend adding 10% for straight layouts and 15% for diagonal or complex geometric layouts.

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