1. Sketch and divide
Draw the odd shape on paper. Divide into rectangles, triangles, and partial circles.
What is odd shape square footage?
Odd shape square footage equals the sum of areas of all sub-shapes after dividing the space. Sketch the odd shape, divide it into rectangles, triangles, and partial circular segments, and calculate each area separately. For surveyed multi-point plots, try the uneven sides calculator.
Getting started
How to Calculate Odd Shape Square Footage
To calculate odd shape square footage, sketch the layout on paper. Divide the shape into rectangles, triangles, or partial circles. Calculate each sub-shape using its formula, then sum the totals.
2. Measure each part
Measure each sub-shape and calculate area: rectangle (l × w), triangle (½ × b × h), circle (π × r²).
3. Add the totals
Sum all sub-shape areas for total odd shape square footage.
Quick reference
Reference
1 acre = 43,560 square feet
1 square yard = 9 square feet
1 square meter = 10.764 square feet
1 square inch = 0.00064516 square feet
Material pricing
Calculate Cost of Materials
Odd shape area times price per unit equals material cost. Multiply total odd-shape area by the price per square foot of flooring, paving, or sod.
There are 2 steps to calculate material cost:
- Enter the price per square foot of the material applied to the odd-shaped area.
- The Square Foot Calculator multiplies the total odd-shape area by your price for material cost estimate.
Odd shapes need 12-15% extra material to handle cuts around irregular edges.
Calculations for ‘L’ Shaped Rooms or Areas
Split an irregular shape or L-shaped room into two distinct rectangular sections. Calculate the square footage of each section separately using Length × Width, then add the two results together.
Example Calculation
Section A is 10 ft by 5 ft (50 sq ft). Section B is 6 ft by 4 ft (24 sq ft). The total is 74 square feet. The Square Foot Calculator supports L-shape input directly — enter the dimensions for both rectangular sections and the calculator adds the areas automatically.
FAQ
Frequently Asked Questions
How do I calculate square footage of an odd-shaped room?
Split the room into rectangular and triangular sections, calculate each area, and add them together. Start with the largest rectangle and then measure bump-outs or alcoves separately.
How do I measure a room with angled walls?
Treat angled sections as triangles or trapezoids. Measure the parallel sides and height, then use the trapezoid formula: Area = [(a + b) / 2] x height.
How do I calculate flooring for a room with a bay window?
Measure the main rectangular area, then add the bay window area as a separate trapezoid or triangle. A typical bay window bump-out adds 15-30 square feet to the room.
What about rooms with rounded corners?
Measure the room as if corners were square, then subtract the small square areas and add quarter-circle areas. For most flooring purposes, treating rounded corners as square is close enough.
How much extra material should I order for odd shapes?
Order 15% extra material for odd-shaped rooms instead of the standard 10%. Complex shapes require more cuts, which creates more waste material.
Can I use this for an oddly shaped yard?
Yes, the same method works outdoors. Break your yard into rectangles and triangles, measure each section, and add the areas together for total square footage.
REFERENCES
Further Reading & References
Trusted external sources and related sections on this site. External links open authoritative references on Wikipedia and government agencies.
Explore this Square Foot Calculator site
Authoritative external references
- WIKIPolygon — Wikipedia
- WIKIArea — Wikipedia
- WIKIIrregular polygon — Wikipedia