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✏️ Free DIY Tool

Square Footage
Calculator

Measure any space, plan your materials, and estimate project costs — all before you ever pick up a brush or nail gun.

📐

Pick Your Shape

Enter dimensions · choose units · get instant results

Rectangle Most common
$
Length Width
Length × Width
Rectangle Border
$
Border Width →
Outer − Inner area
Circle
$
r Diameter
π × (d/2)²
Ring (Annulus)
$
Border W Outer Diameter
Outer − Inner circles
Triangle with Edge Lengths
$
a b c
Heron's formula
Triangle with Base & Height
$
Base H
½ × Base × Height
Trapezoid
$
Base 1 Base 2
½ × (b1+b2) × h
Sector (Pie Slice)
$
angle radius
(angle/360) × πr²
Parallelogram
$
Base H
Base × Height
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Quick Reference

Common area unit conversions

1 acre = 43,560 square feet
1 square yard = 9 square feet
1 square meter = 10.76 square feet
1 square inch = 0.00064516 square feet
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Cost Per Square Foot Guide

How square footage affects your project budget

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Painting a House

Painters typically base quotes on square footage. Key material factors include:

  • Primer: ~200–400 sq ft/gallon
  • Paint: ~300–400 sq ft/gallon
  • Surface type affects coverage
  • Labor usually the biggest cost
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Building a Home

Cost per sq ft varies widely. Get a builder quote and divide by total sq ft for comparison. Watch out for extras:

  • Foundation type
  • Roof pitch & materials
  • Permits & local fees
  • Specialty finishes
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Flooring

Material choice drives cost. Typical installed price ranges:

  • Laminate: budget-friendly, durable
  • Engineered wood: mid-range
  • Hardwood: premium, long-lasting
  • Tile: $0.60 to $100+/sq ft

🪟 Wood Flooring Options

Hardwood — durable, beautiful, requires sanding/refinishing over time. Best for high-traffic areas where looks matter.

Engineered wood — layered construction with better moisture/heat resistance than solid hardwood. Generally more affordable.

Bamboo — eco-friendly, moisture-resistant, easy install. Prone to scratching from furniture and pets.

🧱 Laminate & Tile

Laminate — plywood/fiberboard core with plastic top. Highly scratch- and stain-resistant, low maintenance, and can be installed over existing floors.

Tile (ceramic, porcelain, stone) — incredibly varied in price and style, easy to clean, but can be cold, slippery, and difficult to repair if cracked.