This is a tool that calculates the area of a triangle from its base and height or its sides (using Heron's formula), depending on the area calculation method chosen.

It is also possible to use the area to calculate the height or base of a triangle.

If the Heron's formula calculation method is chosen, the tool can also calculate the perimeter of the triangle from the side lengths.

In the base-height calculation method case, the tool is multi-directional and, therefore, determines the information that needs to be calculated based on which data has been entered. In other words, if two out of the base, height or area are entered, the tool calculates the remaining one. When further data changes are made, the tool re-calculates the same triangle property unless that property is itself changed or a different data field is cleared.

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