Circle Area Calculator
This free online calculator will help you to find the area of a circle, when you know the langth of circle radius or circle diameter.
Using this online calculator, you will receive a detailed step-by-step solution to your problem, which will help you understand the algorithm how to find circle area.
Calculation of Circle Area
π =Area in
Entering data into the circle area calculator
- select defined data - radius, diameter or circumference;
- enter the value of data;
- select units of measurement - meter (m), centimeter (cm) or millimeter (mm);
- select the value of π;
- select in which units you want to get the area - square meters (m2), square centimeters (cm2) or square millimeters (mm2).
You can input only integer numbers or fractions in this online calculator. More in-depth information read at these rules.
Theory. Circle Area
The formulas for calculating of circle area:
- A = π r2
- A =
π d2 1 4
- A =
r - circle radius,
d - circle diameter,
π = 3.141592.
You can input only integer numbers, decimals or fractions in this online calculator (-2.4, 5/7, ...). More in-depth information read at these rules.
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