# What is the diameter of the earth in km

## Earth's circumference - How many kilometers is the earth's circumference?

How many kilometers is that actually **Circumference of the earth**? How can the circumference of the earth be calculated? Is there a difference between the equatorial circumference and the polar circumference? What about the circumference of the other planets and what is the circumference of the sun? We now clarify these questions here:

### Earth circumference in kilometers

The circumference of the earth is - measured at the equator - **40,075.017 km**. Since the earth is not a perfect sphere, there is a difference to the earth's circumference, which is measured at the poles. The earth's circumference there is 40,007.863 km, which is around 67 kilometers less than the equatorial circumference. **To simplify matters, the circumference of the earth is often rounded to 40,000 kilometers.**

### Calculate the circumference of the earth

It is not difficult to calculate the circumference of the earth:

**Earth radius:**The earth's radius is known and is given in textbooks as 6,378 km (geocentric mean).**Earth diameter:**Multiply the earth's radius by 2 = 12,756 kilometers**Pi:**The diameter of the earth must be multiplied by pi - the number of circles, pi is 3.14159265359 ... and this number is permanently programmed into many pocket calculators**Earth circumference:**The results of this calculation are round**40,074 kilometers circumference of the earth**, Deviations are due to rounding.

### Calculate the circumference of the earth in km - equation

The **Equation for calculating the circumference of the earth in km** looks like this:

- U = 2 x r x Pi
*(this is the equation of the circumference)* - U = 2 x 6,378 km x 3.1416
- U = 40,074 km

This equation is used to calculate the circumference of the circle - including the circumference of the earth. So you come to a circumference of around 40,074 km.

### Calculate further planets - circumference

Now you know how to calculate the circumference of the earth. Now it is easy to calculate the circumference of other planets. Here is the radius of the planets in our solar system:

- Mercury = 2,440 km
- Venus = 6,052 km
- Mars = 3,397 km
- Jupiter = 71,492 km
- Saturn = 60,267 km
- Uranus = 25,559 km
- Neptune = 24,764 km

Now you take the equation that we set up to calculate the circumference of the earth and insert the radius of the corresponding planet instead of the earth's radius. Pi doesn't change. Now you can easily calculate the circumference of the individual planets.

### Extent of the other planets

If you don't want to calculate that now, here's the one **Extent of the other planets**:

- Mercury circumference = 2 x 2,400 km x 3.1416 The circumference of Mercury is around 15,300 kilometers
- Venus circumference = 2 x 6,052 km x 3.1416 The circumference of Venus is around 38,025 kilometers
- Mars circumference = 2 x 3,397 km x 3.1416 The circumference of Mars is around 21,344 kilometers
- Jupiter circumference = 2 x 71,492 km x 3.1416 The circumference of Jupiter is around 449,200 kilometers
- Saturn circumference = 2 x 60,267 km x 3.1416 The circumference of Saturn is around 378,669 kilometers
- Uranus circumference = 2 x 25,559 km x 3.1416 The circumference of Uranus is around 160,592 kilometers
- Neptum circumference = 2 x 24,764 km x 3.1416 The circumference of Neptune is around 155,600 kilometers

Here, too, the information is rounded, the more digits you use for Pi, the more precise your result will be. There are also different information about the size of the planets in different sources. That may explain deviations

### Calculate the circumference of the sun

To calculate the circumference of the sun, you only need the radius of the sun, which is 696,342 km. You know the equation for calculating the sun's circumference:

- U = 2 x r x Pi
- U = 2 x 696,342 km x 3.1416
- U = 4,375,256 km

The** The sun's circumference is around 4,375,256 km**. The sun's circumference is 108 times larger than the circumference of the earth.

Image source: pixabay.com / LoganArt

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