# Square

## Perimeter, Area, Diagonal of square

This is the best square 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 decimeters, calculation will be also in decimeters.

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

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

### Formula

O = |
4 × a | [m] | |

P = |
a × a = a² | [m²] | |

u = |
a √2 ≈ a × 1,41 | [m] |

**a** … length of one side

**u** … diagonal

### The square and the circle (disc)

**Diagonal** (u) = Excircle diameter

**Side of square** (a) = Incircle diameter

### Calculation of square online

### Links

- Wikipedia -
**Square** - Wikipedia - what can be a
**square** - Decimal mark

### How to calculate ...

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

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

**GEOMETRY**- disambiguation

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