How To Find An Angle With A Speed Square

When it comes to woodworking and construction, finding the correct angle is crucial to ensuring that your project is accurate and safe. One tool that can make this process easier is a speed square. In this article, we will discuss how to find an angle with a speed square, step by step.

Step 1: Understand the Basics of a Speed Square

Before we dive into how to find an angle with a speed square, it’s important to understand the basics of this tool. A speed square is a multi-functional tool that can be used to measure angles, mark cuts, and square up corners. It has two main components: the body and the tongue. The body is the flat, triangular-shaped part of the tool, while the tongue is the shorter, perpendicular piece that protrudes from the body.

Step 2: Set Up Your Speed Square

To begin finding an angle with your speed square, you’ll need to set it up properly. Start by placing the body of the speed square against the edge of the material you’re working with. Make sure it’s flush with the edge, then hold it in place with one hand.

Step 3: Determine the Angle You Need

The next step is to determine the angle you need. This will depend on the specific project you’re working on. For example, if you’re building a roof, you may need to find a 45-degree angle. If you’re making a picture frame, you may need a 90-degree angle.

Step 4: Align the Tongue

Once you’ve determined the angle you need, it’s time to align the tongue of the speed square. Move the tongue up or down until it lines up with the angle you need. You can use the markings on the body of the speed square to help guide you.

Step 5: Mark Your Angle

Once you’ve aligned the tongue with your desired angle, it’s time to mark it. Hold the speed square firmly against the material, then use a pencil or marker to mark the angle along the tongue. This will give you a clear line to follow when making your cut.

Step 6: Double Check Your Angle

Before making any cuts, it’s important to double check your angle. Use a protractor or angle finder to ensure that your angle is correct. This will help you avoid any mistakes that could ruin your project.


How do I find a 45-degree angle with a speed square?

To find a 45-degree angle with a speed square, align the tongue of the tool with the 45-degree mark on the body. Then, mark your angle along the tongue and double check it with a protractor or angle finder.

Can I use a speed square to find angles on curved materials?

No, a speed square is designed for use on flat materials only. If you need to find an angle on a curved surface, you’ll need to use a different tool, such as a bevel gauge.

Can I use a speed square to make angled cuts with a circular saw?

Yes, a speed square can be used to guide a circular saw when making angled cuts. Simply line up the tool with your desired angle, then use it as a guide for your saw.


Learning how to find an angle with a speed square can be a valuable skill for anyone working in woodworking or construction. By following these steps and taking the time to double check your angles, you can ensure that your projects are accurate and safe. Remember to always use caution when working with power tools, and to wear appropriate safety gear.