# Sphere and ball

## Circumference, surface area and Volume of Sphere

This is the best sphere calculator on-line you have ever seen.

### Calculation

Enter a value to any field - the others are calculated themselves. If you change a value in any field, the others are automatically recalculated.

For decimals you can enter either **points** or **commas**

as decimal marks (but only one decimal point in a value).

The result will be in the units that you enter into the fields.

For example: if you enter kilometres, calculation will be also in kilometres.

If appears an error **NaN**, check whether you enter to the field

a correct value, ie. **without any letters and other characters**.

### Formula

d = |
2 × r | [m] | |

O = |
π × d = 2 × π × r | [m] | |

P = |
π × d² = 4 × π × r² | [m²] | |

V = |
1/6 π × d³ = 4/3 π × r³ | [m³] |

**d** … diameter = 2 × radius

**r** … radius = ½ of diameter

**S** … center of sphere

**o** … axis

**π** (Pi) = 3,14 (about)

### Sphere and Cube

**Space/volume diagonal of cube**(u

_{3}) = diameter of circumscribed sphere

**Length of side edge of cube**(a) = diameter of inscribed sphere

### Calculation of sphere online

### Links

- Wikipedia -
**Sphere** - Wikipedia -
**Ball** - Wikipedia - what can be a
**circle** - Pi number
- Decimal mark

### How to calculate ...

Bold shapes and objects are already in operation. The others contain only a formula.

**Circle**- online calculator**Square**- online calculator**Cube**- online calculator**Cylinder**- online calculator- Triangle
**Rectangle**- online calculator- Cuboid
- Ellipse

**GEOMETRY**- disambiguation

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