Area Calculator
Calculate area of common shapes.
Calculating the area of common geometric shapes is essential for construction estimates, landscaping projects, classroom geometry, and DIY home improvement. Utilitoo's Area Calculator supports rectangles, circles, triangles, and trapezoids with clear formula labels in the results.
Contractors estimating flooring or paint coverage, gardeners planning lawn seed quantities, and students verifying homework all need quick area math without memorizing every formula. Select a shape, enter dimensions, and get instant results.
Choose your shape, enter the required dimensions, and click Calculate. Results show the computed area and the formula used. Pair with Volume Calculator for three-dimensional projects or Percentage Calculator for cost-per-area estimates.
All calculations run locally in your browser on Utilitoo. Free for builders, students, and DIY enthusiasts. Enter dimensions in any unit - results use squared units of your input.
Area Calculator multiplies length by width for rectangular spaces. It is a fast planning aid for DIY, real estate browsing, and classwork - not a surveyor's plat measurement.
Common use cases
- Estimating floor, wall, or garden bed area before buying materials.
- Homework geometry for rectangles when a formula sheet is not handy.
- Comparing room sizes while apartment hunting.
- Quick square-footage checks for movers and storage quotes.
- Converting between square meters and square feet for international listings.
Tips & common mistakes
This calculator targets rectangular areas - irregular shapes need segmenting or another method. Keep length and width in the same unit. Pair with Volume Calculator when you also need height for fill or paint coverage estimates. For painting, measure each wall and subtract large openings for a better material estimate. Garden beds that are L-shaped should be split into rectangles and summed. Volume Calculator adds height when you need mulch or concrete volume next.
Common errors
- Mixing feet and inches in one field without conversion.
- Forgetting to subtract closets or non-painted openings when estimating materials.
How to use
- Select shape.
- Enter dimensions.
- View area.
Frequently Asked Questions
Which shapes can I calculate area for?▼
Rectangle, circle, triangle, and trapezoid shapes are supported.
What units should I use?▼
Enter dimensions in any unit. The result is in squared units of your input, such as sq ft or sq m.
How do I calculate circle area?▼
Select circle, enter the radius, and Utilitoo applies the πr² formula.
What dimensions does a trapezoid need?▼
Enter both parallel bases (A and B) and the height.
Is my data uploaded?▼
No. Length and width stay local. Area results are computed in your browser without a server round-trip.