Free Online Area Tool

Calculate the square footage of any space.

An essential tool for homeowners, contractors, and designers. Pick a shape, enter your measurements, and get an instant, accurate area — perfect for flooring, painting, and renovation planning.

Choose a Shape Try the Calculator
length · 30 ftwidth · 20 ft
600square feet
31 shapes7 unitscost estimate
Quick start

Try it now — Rectangle

Most rooms and floors are rectangles. Enter the length and width to see the area instantly.

Rectangle
Area = Length × Width
Length Width Length × Width = Area
Pick your shape

31 calculators, one for every space

Each calculator includes unit conversion, optional cost estimation, and a step-by-step guide.

RectangleL × W Squareside² Rectangle Borderouter − inner Circleπ r² Semicircle½ π r² Ellipseπ a b Ringπ(R²−r²) Sector½ r² θ Triangle½ b h Triangle (edges)Heron's Parallelogramb × h Rhombus½ d₁ d₂ Trapezoid½(a+b)h Pentagonregular Hexagonregular Octagonregular L-Shaped Roomtwo rects U-Shaped Kitchenthree rects T-Shaped Roomtwo rects Stadium / CapsuleL·W + π r² Heptagon7 sides Decagon10 sides Circular Pathπ(R²−r²) Circular Segmentarch / bay Irregular Quad4 sides + diag Irregular Triangle3 sides Kite½ p q Stepped Layoutmain + step Gabled Wallrect + tri Room Wallspaint / paper Drop Ceilingtile count

What is square footage and why it matters

Square footage is the measure of a two-dimensional area expressed in square feet — the total number of one-foot-by-one-foot squares that fit inside a boundary. It is the single most useful number in home improvement, construction, interior design, and real estate, because it connects directly to how much material a project needs and how much a space is worth.

Whether you're laying flooring, painting walls, ordering tile, planning a garden bed, or comparing properties, getting the area right is the first step. This site gives you a dedicated calculator for every common shape, each with unit conversion across feet, yards, meters, inches, centimeters, miles and kilometers, plus an optional cost estimator so you can turn an area straight into a budget.

How to use these calculators

  1. Pick the shape that matches your space from the grid above.
  2. Enter your measurements and choose the unit for each — they don't all have to match.
  3. Add a price per unit (optional) to estimate total material cost.
  4. Press Calculate to see the area, and expand the unit table to view the result in every supported unit.

A quick tip: always add a waste factor

No real project uses the exact calculated area. For flooring and tile, add roughly 5–10% (more for diagonal patterns or irregular rooms) to cover cuts, mistakes, and damaged pieces. Buying slightly more is almost always cheaper than running out mid-job.