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Square Footage Calculator — Quick & Accurate Online Calculator & Guide

Calculate square footage for rectangles, circles, and L-shaped rooms. Supports feet and meters, includes wastage for materials, and estimates total cost.

✓ Formula verified: January 2026

Sq Footage

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Enter Values

Square Footage
120 ft²

Square Meters

11.1484 m²

With 0% Waste

120 ft²

Shape

Rectangle

Dimensions

10 × 12 ft

What if your length (ft) changes? 9 → 108 ft² · 10 → 120 ft² · 11 → 132 ft²

Scenario Comparison

Conservative (5%)
$16,470.09
$6,470.09 interest
Your scenario (7%)
$20,096.61
$10,096.61 interest
Aggressive (10%)
$27,070.41
$17,070.41 interest
High-risk (14%)
$40,224.71
$30,224.71 interest
Best return
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Area Breakdown
Width (w)Length (l)

Square Footage

120 ft²

Square Feet

120.00

Square Meters

11.15

Dimensions

10 × 12 ft

With Waste

120 ft² (no waste applied)

Rectangle

Measurement Tip

Always measure to the nearest ⅛ inch (3 mm) for accuracy. When measuring for flooring, measure at multiple points since walls are not always perfectly straight. For irregular spaces, break the area into smaller rectangles, calculate each one, and add them together. Remember to add a waste factor of 5-15% when ordering materials.

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