Cut a 45-Degree Angle with a Circular Saw (DIY)

Building a table or frames requires several square joints. Cutting square joints at 45 degrees is the easiest way to achieve this. So, mastering the 45 degree cut using a circular saw can come in real handy. Usually people use a miter saw for angular cut but you can achieve pretty decent results with a circular saw.

Woodworkers and construction professionals love circular saws because they can cut wood in a breeze. It can cut a bunch of materials and metals like steel, aluminum, pvc, plywood, tiles, etc. But simply cutting a material isn’t enough all the time. Sometimes you’ll need specific cuts in shapes, sizes, angles and patterns.

For now, let’s see how to cut a 45-degree angle with a circular saw. By following the given guide you can easily get the job done.

How Do You Measure a 45 Degree Angle?

You must divide this angle measurement by two in order to use it in cutting the piece of wood. For example, dividing a 90-degree inside angle by two provides a 45-degree angle.

  • With a speed square, you can measure 45 degrees perfectly.
  • Miter boxes and pencils can be used to draw 45-degree angles.
  • You can measure 45-degree with a protractor or compass.
  • Right angles can be divided into two equal parts, each measuring 45-degree.

The 45-Degree Cutting Process with a Circular Saw

The versatility of circular saw makes it easy to use, quick, gives clean cuts and handles critical tasks with ease. A 45-degree angular cut is one of the hundred cuts it can make effortlessly. You can make a variety of cuts using a circular saw including bevel, rip, crosscut, and miter cut.

Types of 45-degree cut

Circular saws can make two types of 45-degree angle cuts: bevel cuts and miter cuts. I will show you both in this guide.

Things You Will Need

  • Circular saw
  • Speed square
  • Protective sheet
  • Clamps
  • A straight edge
  • Masking tape
  • Safety glasses
  • Hearing protection
  • Blade Adjustment
  • Bevel ar miter cut

1. Bevel Cutting at 45 Degree with a Circular Saw

A bevel is an angular cut relative to the face of the materials. It’s cut right at the thickness of the piece instead of the width and length. This can be an angled cut along the whole side of the cutting wood or any materials.

Place the protection sheet on the working surface. These sheets protect the work surface from the blade. Put it on top of the wood to be cut.

Next, apply masking tape to the area where you want to mark. The masking tape prevents splinters while cutting the wood. Over the masking tape, draw a line using a speed square and a pencil.

The offset distance between the saw blade and materials should be measured and marked. Clamp a straight edge or long level on the drawn line. The wood should be clamped and secured at both ends and at the middle. With the help of the angle guide on the saw, adjust the angle of the blade with the indicator provided. Adjust the blade depth to suit the depth of the wood you wish to cut.

Blade Adjustment for Bevel Cut

The angle guide of a circular saw must be adjusted to achieve a 45-degree angle cut. Place the material in alignment with the blade. Use a clamp to hold and set the angle guide at 45 degrees. When cutting, saw angles tend to slip; if you attach a clamp, it won’t be. Be sure to double-check everything, the blade position, the wood piece, and the alignment, before turning on the circular saw.

2. Miter Cutting at 45-Degree Angle with a Circular Saw

A miter is an angled cut that makes an angle beside 90-degrees on the materials and relative to the square side of the materials. This is most used in creating wood picture frames.

Place a rafter angle square against the board that you plan to cut as a guide. You should position the square so that the 45-degree angle of one side matches the angle of the miter cut.

Using the saw, run it along the 45-degree edge of the square, and cut through the board.

Blade Adjustment for Miter Cut

Circular saws usually come from miter adjustment towers at the bottom. The angle guide of a circular saw adjusts accurately before cutting the miter. As a guide, use the clamp or hold a rafter angle square firmly in material which you want to cut. Ensure to double-check everything, the blade position, piece of cutting material, and the alignment, before moving on the circular saw.

Preparing and Safety Precautions:

  • When exposed to harmful or nuisance dust, wear a respirator or dust mask.
  • Wear safety glasses, goggles, or a face shield.
  • When working in loud areas, wear hearing protection.
  • Make sure the retracting blade guard works smoothly.
  • For a successful cutting, make sure you select a sharp blade.When the saw is unplugged, set the depth of the blade and lock it.


1. How Thick of Wood Can a Circular Saw Cut?

When cutting at a 45-degree angle, most saws with blade capacities of 6 inches or more can cut through 2-inch in one pass. In a single pass, a 5-inch saw can cut through 2-inch-thick material at 90 degrees but it takes two passes at 45 degrees.

2. What Type of Material is Most Commonly Cut with a Circular Saw?

Using the appropriate blade, circular saws are capable of cutting wood, concrete, steel, and ceramic tile.

3. Can a Circular Saw Cut a 4×4?

Circular saws usually come with a 7- 1/4″ blade with a cutting depth of just over 2- 2/1″ at 90 degrees, and usually less when cutting bezels. The smaller 6- 1/2″ blade cuts up to 2- 1/8″ thick. Because of this, the two most common blades can’t go through a 4×4 in a single pass.

4. How do I Cut 2×4 at an Angle?

Diagonally turn the saw. If necessary, use a speed square. You can also set the blade on some saws to whatever degree you want to cut. It’s easy way to screw a piece of wood onto the 2×4 as a rip guide, and use your circular saw.


A circular saw is a multipurpose tool, which can hold many kinds of material, mainly wood. It is not only used for straight cuts, but can cut at different angles as well. A circular saw is capable of being used for a large number of cuts, and you also apply it to decorate your house by yourself.

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