# Circle Calculator: How to Calculate the Diameter of a Circle with the formulas compared to the Calculator

**AllCalculator.net** is a reliable online platform that provides efficient tools for various mathematical calculations. When it comes to measuring or calculating the Diameter of a circle, our **Circle Calculator** is the best choice. By inputting the values of the Radius, circumference, or area of a Circle into the Circle Calculator, you can effortlessly determine the Diameter of a Circle. Trust AllCalculator.net for accurate and convenient mathematical solutions!

There are various formulas to calculate the Diameter. However, you can use the related Formula if these values are given.

**d=2r **

Determine if the Radius is known.

**d=2√a/π **

Determine if the area is known.

**d=C/π **

Determines if circumference is known.

Here

r=represents the Radius

d=diametet

a=area

C=Circumference of the Circle

The Calculator will pick any of these formulas and **Calculate the Circle**

### How to determine the length of a Circle?

- Suppose you want to find the length of the Radius of a circle. Suppose circumference value is 10cm
- The adequate Formula for this will be r=C/(2π)
- Now input the values in the Formula
- The answer will be r=10cm /2π
- You can double-check the results. The values should be 1.59155cm. It will be the value of the Radius.

The length of half Circle is πtimes Radius. It is the length of any two equally divided circles.

What are the Circle Formulas?

The Circle Calculator uses various formulas to **Calculate The Area** to determine the Radius or the Diameter in a given problem.

Some of the formulas are listed below.

One can use these formulas for manual Calculation as well.

The Formula to calculate the Diameter is the easiest. It is 2×radius.

r=d/2 or d=2×r

To calculate circumference using the Formula. The formulas express are the Radius and **Diameter of the Circle**.

**C=2πr ****C=2√(π/A)**

### To Calculate the Area of the Circle

The Formula uses the Radius, Diameter and Circumference of the Circle.

**A=πr^2 ****A=C^**2(4π)

These are some formulas the Calculator uses to calculate the required value in a missing equation.

### Conclusion

The Circle Calculator calculates the area, perimeter, Radius, and other required values. You can also cross-check the results with the formulas given above. It will help in understanding the accuracy of the Calculator.