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Online Square Footage Calculator
Calculate the area of a rectangle, circle, triangle, trapezoid, or bordered shape in square feet, meters, yards, acres, and more, with an optional cost estimate.
| Result | |
|---|---|
| Square Footage | 5.0106 ft² |
| Square Inches | 721.52644 in² |
| Square Yards | 0.55673 yd² |
| Square Meters | 0.4655 m² |
| Acres | 0.00012 acre |
| Hectares | 0.00005 ha |
| Cost ($) | 7215.2644 |
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What Is This Tool?
The Square Footage Calculator finds the area of six common shapes: a rectangle, a rectangle with a border, a circle, a circle with a border, a triangle, and a trapezoid. You enter the dimensions in metric or imperial units, and it returns the area in square feet, square inches, square yards, square meters, acres, and hectares. You can also add a quantity and price to estimate the total cost, which makes it useful for flooring, tiling, paint, landscaping, and similar projects.
How to Use This Tool?
- Choose the shape that matches your area.
- Pick metric or imperial units and enter the dimensions.
- Optionally set quantity and price to estimate cost.
- Click Calculate to see the area in every unit.
Key Features
- Calculates area for six shapes, including bordered rectangles and circles.
- Switches between metric and imperial input units.
- Shows results in square feet, inches, yards, meters, acres, and hectares.
- Estimates total cost from quantity and unit price.
- Lets you download the result as a PDF.
Examples
- A rectangle 49 cm by 95 cm covers about 0.4655 m² (5.0106 ft²).
- A circle with a 49 cm diameter covers about 0.1886 m².
- A triangle with sides 7, 6, and 5 cm is solved with Heron's formula.
- Adding a quantity and unit price returns an estimated total cost.
Common Use Cases
- Estimating flooring, tile, or carpet for a room.
- Working out paint or wallpaper coverage for a wall.
- Measuring lawn, garden, or patio areas for landscaping.
- Calculating material and cost for a renovation project.
- Checking geometry homework on area of shapes.
Tips & Best Practices
- Pick the shape and unit system before entering values.
- For bordered shapes, keep the border smaller than the overall size.
- For triangles, make sure any two sides add up to more than the third.
- Use the quantity field for repeated identical areas, like several rooms.
- Add a unit price to turn the area into a quick cost estimate.
Limitations
- Covers six preset shapes rather than fully custom outlines.
- Bordered shapes assume an even border on all sides.
- Cost estimates use a single price and quantity, not tiered pricing.
- Results are rounded, so very small areas may show as near zero.
Frequently Asked Questions
- Can I switch between metric and imperial units?
- Yes. Use the Metric/Imperial toggle to enter dimensions in centimeters or inches, and the result is shown in all units.
- How does the bordered rectangle work?
- It calculates the area of the border only, by subtracting the inner area from the total area.
- How is the triangle area calculated?
- It uses Heron's formula, which finds the area from the lengths of all three sides.
- How is the cost estimated?
- It multiplies the area (in the unit you choose) by the price and the quantity you enter.
Key Terminology
- Square footage
- The area of a surface measured in square feet.
- Area
- The amount of space inside a two-dimensional shape.
- Heron's formula
- A way to find a triangle's area from the lengths of its three sides.
- Annulus
- The ring-shaped region between two circles that share a center.
- Hectare
- A metric unit of area equal to 10,000 square meters.