Odd-Shaped Area Calculator
Split an odd-shaped space into rectangles and triangles, find the area of each section, and add the results. You can also convert a known total area between units.
Free area calculator
Odd Shape Area Calculator
Odd Shape Area Calculator: For an odd-shaped space, break it into rectangles and triangles, calculate each section, and add the results.
Known Area
Room Dimensions
Multiple Rooms
Room (Feet + Inches)
ft
in
ft
in
Rectangle (Feet + Inches)
ft
in
ft
in
Wall & Window Dimensions
Cathedral Wall Dimensions
Square Dimensions
Rectangle Dimensions
Rectangle Border
Circle Dimensions
Circle Border (Annulus)
Annulus Dimensions
Triangle (3 Sides)
Triangle (Base & Height)
Trapezoid
Regular Polygon
Area + Depth (Volume)
Material Waste FactorOPTIONAL
%
Estimate Material CostOPTIONAL
Calculation Results
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Room Calculator → House Calculator → Bedroom Calculator → Bathroom Calculator → Kitchen Calculator → Multiple Rooms → Rectangle Calculator → Triangle Calculator → Circle Calculator → Trapezoid Calculator → Regular Polygon Calculator → Irregular Shape → Odd Shape → Uneven Sides → Flooring Calculator → Tile Calculator → Paint Calculator → Concrete Calculator → Insulation Calculator → Lawn Calculator → Yard Calculator → Landscaping Calculator → Pool Calculator → Garage Calculator → Roof Calculator → Wall Calculator → Feet & Inches → Inches Calculator → Height Width Length → Sq Ft to Acres → Cubic Yards Calculator →
How It Works
1
Select Shape
Choose the shape that matches your space.
2
Enter Dimensions
Enter measurements in any unit. Add quantity, waste factor, and material price if you need them.
3
Get Results
See area in ft², in², yd², m², and acres, plus a cost estimate when you enter a price.
Frequently Asked Questions
How do I calculate square footage for different shapes?
Pick the shape from the dropdown: Room, Rectangle, Circle, Triangle (Heron's or base times height), Trapezoid, Cathedral Wall, Annulus, and others. Enter measurements and click Calculate. The calculator runs the right formula and shows square feet, square inches, square yards, square meters, and acres.
Can I convert between square feet and other units using this calculator?
Yes. Every calculation shows five area units at once: square feet (ft²), square inches (in²), square yards (yd²), square meters (m²), and acres. You do not need a separate conversion step.
How do I measure for a construction project?
Measure each room, wall, or area in your project. Enter numbers in the calculator, pick the shape, and click Calculate. Add a waste percentage (5 to 15% depending on material), enter cost per unit area, and the calculator totals material quantity and cost.
What is the waste factor and how much should I add?
The waste factor increases total area by a percentage to cover material lost in cutting and installation. Use 5 to 10% for standard flooring and carpet. Use 10 to 15% for diagonal tile or complex layouts. Enter the percentage in Material Waste Factor and the calculator adjusts total area.
Can I use this calculator for landscaping projects?
Yes. Estimate area and material needs for gardens, walkways, patios, and lawns. Pick the shape that fits your space, enter dimensions, and get total square footage. Enter a material price to figure costs for sod, mulch, pavers, or gravel.
How do you convert sq ft to sq m?
Divide square feet by 10.7639 to get square meters. Example: 500 ft² ÷ 10.7639 = 46.45 m². The calculator shows the m² equivalent on every run.
What is 10ft by 10ft in square metres?
10 ft × 10 ft = 100 ft², which equals 9.29 m². A 10-by-10-foot room (3.048 m × 3.048 m) has about 9.29 square meters of floor area.
How does the cathedral wall calculation work?
The formula is ½ × Base Width × (Left Height + Right Height). Left and right heights differ because the ceiling slopes. The shape is a right trapezoid. Enter base width and both wall heights for area in square feet.
Can I use mixed measurement units?
Yes. Each input has its own unit selector: feet, inches, yards, meters, or centimeters. The calculator converts internally before computing area. Length in meters and width in feet still gives an accurate result.
What is the difference between a circle border and an annulus?
Both use π × (R² − r²). Circle border and annulus both find the area between two concentric circles. The calculator lists both names because some people search "circle border" and others search "annulus." The result is the same.