Diameter of a Circle Calculator
If you're wondering how to calculate the diameter of a circle, this diameter of a circle calculator is a perfect choice.
You will need either the radius, the circumference, or the area of a given circle for the calculations. Take a look at the picture above the calculator to visualize each element.
How do I calculate the diameter of a circle?
There are three methods for diameter estimation. Choose the useful one based on the data you have. This calculator will automatically estimate all of the other values.
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The first one is based on the radius of the circle. The diameter equals the length of two radiuses.
d=2rd=2r
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Area of a circle:
d=2πAd=2πA
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Circumference of a circle:
d=πcd=πc
where:
- rr stands for the radius of the circle,
- cc for circumference,
- AA for area, and
- dd stands for the diameter of the circle.
Other circle calculators
If you were looking for the diameter of a circle calculator, here are a couple more tools that may interest you:
- Circle calc: find c, d, a, r
- Circle measurements calculator
- Circle formula calculator
- Radius of a circle calculator
- Circle length calculator
- Circumference and area of a circle calculator
- Circle perimeter calculator
- Circumference to diameter calculator
- Square footage of a circle calculator
- Square inches of a circle calculator
FAQs
- What is the diameter of a 9-inch radius circle?
- If the circle radius is 9 inches, then the diameter is 18 inches. The easiest formula for the diameter is d = 2r, where d is the diameter and r is the radius.
- How to measure the diameter of a circle?
- The diameter is the radius multiplied by two. How to calculate the radius? Measure the distance from the center to any point on the circle.
- How do you find the radius and diameter of a circle?
- To calculate the radius of a circle, divide its circumference by 2π; for the circle's diameter, divide the circumference by π. Let's say that the circumference of a given circle is 20 inches. Therefore, its radius is 3.18 in, and its diameter is 6.37 in.
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