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` = ( "a" + "b" + "c" + "d" )/2 `

Enter a value for all fields

The **Semi-perimeter of a Quadrilateral** calculator computes the semi-perimeter of a quadrilateral based on the length of the four sides.

**INSTRUCTIONS:** Choose units and enter the following:

- (
**a**) Length of side**a**. - (
**b**) Length of side**b**. - (
**c**) Length of side**c**. - (
**d**) Length of side**d**.

**Semi-perimeter (s):** The calculator returns the semi-perimeter in meters. However, this can be automatically converted to compatible units via the pull-down menu.

- Area of a Quadrilateral from four sides and an angle
- Area of a Quadrilateral from four sides and the diagonal
- Quadrilateral Perimeter
- Quadrilateral Semi-Perimeter
- Quadrilateral Volume

The formula for the semi-perimeter of a quadrilateral is:

`s = (a+b+c+d)/2`

where:

- s = quadrilateral semi-perimeters
- a = length of side a
- b= length of side b
- c = length of side c
- d = length of side d