How to Use A Measuring Square

A measuring square (which is actually the shape of a triangle) is a carpenter's tool generally used for marking angles when cutting rafters or boards. This square comes in a 6 inch and a 12 inch size. There is a lip on one side to secure it to the edge of the board. One edge is a ruler and the other has markings for angles and notches at ¼-inch increments. Follow these steps to learn how to use a measuring square.

Difficulty: Moderately Easy

Instructions

Things You'll Need:

• Safety glasses
• Measuring square
• Marking pencil
• Saw

1. Determine the angle needed for your project.

2. Set the pivot mark at the edge of the board. This mark is imprinted on one corner of the tool.

3. Rotate the square around that point until the edge of the board aligned with the correct number on the common scale.

4. Draw a line along the ruler side of the square. This will be the cutting line.

5. Cut the board or rafter along the line you drew.

Tips & Warnings

• Measuring squares come in plastic and aluminum. The aluminum is more durable.
• This square comes in a 6 inch and a 12 inch size. The 6 inch will fit in the toolbox more easily and is the most commonly used.
• There are many other uses for this tool. It is a rafter square, protractor, miter square and scriber. It is useful for drawing lines, guiding a saw or on any other job that requires a 90-degree angle.
• If you push the perpendicular edge of the square up against a straight side, you will have either a 90-degree or a 45-degree angle to mark.