ToolGrid AIRectangle Area and Perimeter
Calculate area, perimeter and diagonal of a rectangle.
Runs entirely in your browser — your selected files are not uploaded by this tool. Device-provided speech voices may use online services.
About this free rectangle area and perimeter tool
Calculate area, perimeter and diagonal of a rectangle. Calculators answer a defined arithmetic question using the values you supply. Keep units and currencies consistent, choose the correct starting amount and inspect the assumptions before using a result. Estimates do not replace a lender quotation, an official tax rate, a medical assessment or a jurisdiction-specific deadline rule.
A practical example
A concrete example uses length: 6; width: 8. The result is Area: 48 Perimeter: 28 Diagonal: 10.
Before you rely on the result
Results use floating-point arithmetic and are rounded to six decimal places. Confirm units and required precision before relying on the result.
Frequently asked questions
Is the rectangle area and perimeter free to use?
Yes. The Rectangle Area and Perimeter is free, needs no account and has no usage limit beyond what your device can handle.
Are my files or numbers uploaded anywhere?
No. The Rectangle Area and Perimeter runs in your browser, so the values and files you enter stay on your device. Close the tab and nothing is kept.
What does the rectangle area and perimeter do?
Calculate area, perimeter and diagonal of a rectangle. Calculators answer a defined arithmetic question using the values you supply. Keep units and currencies consistent, choose the correct starting amount and inspect the assumptions before using a result. Estimates do not replace a lender quotation, an official tax rate, a medical assessment or a jurisdiction-specific deadline rule.
When should I double-check the result?
Results use floating-point arithmetic and are rounded to six decimal places. Confirm units and required precision before relying on the result.
Can I share my result?
Yes. Use Copy result or Download, and on calculator-style tools use Copy share link to send someone a link that opens with the same inputs filled in.