Area Calculator
Area and perimeter of a square, rectangle, circle, triangle, parallelogram or trapezium — in sq ft, sq m and cents.
Result
How to use
- 1
Pick the shape and the unit you measured in.
- 2
Fill in the measurements shown.
- 3
See the area (also in sq ft, sq m and cents) and the perimeter.
Questions
How many square feet is one cent?
1 cent = 435.6 sq ft (about 40.47 sq m). 100 cents make one acre (43,560 sq ft). Cents are widely used for land in Kerala, Tamil Nadu and Andhra Pradesh.
How is a triangle's area found from three sides?
With Heron's formula: s = (a + b + c) ÷ 2 and Area = √(s(s − a)(s − b)(s − c)). The three sides must satisfy the triangle rule — any two sides together must be longer than the third.
What is the area of a trapezium?
Half the sum of the parallel sides times the height: Area = ½ × (a + b) × h.
About this Area tool
Area Calculator — Area and perimeter of a square, rectangle, circle, triangle, parallelogram or trapezium — in sq ft, sq m and cents. It is one of 200 free tools on namasivayam.in, made by software engineer Namasivayam Vadivelan for everyday use in India.
Everything is calculated instantly in your browser: nothing you type or upload is sent to any server, there is no sign-up, and it works on mobile and desktop. Pick the shape and the unit you measured in.
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Results are estimates to help you plan. They are not financial, tax or medical advice.