How to Cut Straight With Circular Saw: An Easy Guide

So you’ve picked yourself up a nice circular saw. Well done — it’s one of the most versatile woodworking tools many people ever use. If you’re brand new to this type of work, you may be wondering how to cut a straight line with the darn thing.

Don’t worry, you’re not alone. While even straight lines can be elusive at first, a little practice can go a long way. This page is designed to introduce you to the fundamentals. You’ll leave with a much better understanding of how to cut straight lines with your tool.

cutting wood

A Quick Video Guide

If you’re looking for a decent overview of this whole process, we strongly recommend checking out this video from House Improvements on YouTube. In general, they produce some excellent content that can really help newcomers get better at woodworking. Check them out!

General Tips – Our Cutting Guide

Below are a series of general tips to keep in mind when you cut a straight line with your circular saw. Read them closely, put them into practice and you’ll be working like a pro in no time.

What You’ll Need

It goes without saying that each project is a little different. Your specific tool list will vary depending on the specific task at hand. That said, there are a few things that you’re likely to need when making a straight cut with circular saws. We list them below:

  • A circular saw
  • A guide with a straight edge
  • A clamp
  • Your eye protection
  • Your ear defenders
  • A pencil
  • A tape measure

Use a Straight Edge Guide

A great way to guarantee that your cut will indeed follow a straight line is to use a guide that you trust. If you already have a piece of straight plywood, for example, you can clamp this securely to your cutting piece to act as a straight edge guide.

Following a guide in this way makes it much easier to maintain accuracy when compared to just working by eye alone.

Measure Your Base Distance

Your saw uses a rectangular base to maintain stability and to protect you while working. You’ll be cutting along either the left or right side of this base when you cut a straight line with your saw. It’s important to measure the distance between your chosen base side and your blade.

Why? Because you’ll need to factor this distance into your measurements for the board you’re cutting in order to get an accurate cut. Quickly measure the distance between your base edge and blade and factor it into your calculations before you start work.

Measure and Mark Before Cutting

You’ll also need to measure the length and width of the piece you’d like to cut. Use your tape measure and pencil to clearly mark where you plan on cutting. Remember the mantra ‘measure twice, cut once.’ The more attention you pay at this stage, the easier it will be to cut a straight line with your circular saw.

Set Your Blade Depth

Before you start work, you’ll need to make sure that your blade is set to the appropriate depth. This will depend on the specific material that you’re cutting. Measure the thickness of your cutting piece and set your blade to the appropriate depth.

Remember to always follow good safety practices when adjusting your blade. Check and double-check your manual to avoid the risk of injury and damage.

Practice Makes Perfect

Hopefully you agree that the steps outlined above are fairly straightforward. We strongly recommend watching the video we linked above for extra clarity. Even though the process for straight cuts with a circular saw is pretty simple, it’s worth keeping in mind that you might not get it perfect on your first try.

Any skill requires at least some patience to master. The more you attempt this kind of cut, the easier it will be to execute it properly. Keep practicing and you’ll be an expert before you know it!

Cut a Straight Line – Safety Considerations

This section will outline some general safety considerations to keep in mind when working with your power tools. We know it’s not the most thrilling subject in the world, but it is very important. Power tool injuries are no joke and can be avoided with some very simple safety techniques.

Always Wear Good PPE

Sufficient protective clothing is a must when working with power tools of any kind. Consider the following:

  • Eye protection should be worn at an absolute minimum
  • A full face shield may be necessary in certain circumstances
  • Ear defenders or plugs should be worn when making cuts
  • Grippy, protective shoes should be worn at all times
  • Consider a mask or respirator, especially when working with wood that produces lots of dust

Changing Your Blade

It’s common to have to change your blade when working to accommodate a variety of different cutting materials and projects. You should always follow the safety guidelines defined in your tool’s manual. Generally speaking, you should engage your arbor lock and unplug your saw before getting anywhere near your blade.

The last thing you want is a blade spinning at thousands of RPM near your fingers!

Keep Distractions to a Minimum When you Cut a Straight Line

Maintaining good focus levels is vital when doing any kind tool work. This will not only keep you safe by reducing the risk of accidents, but it will also have the added benefit of keeping your straight line perfect! A distracted worker is far less likely to cut accurately.


We hope this page has demystified the whole process for you. Remember that practice makes perfect when it comes to building a new skill. The more time you can dedicate to trying out new cutting techniques and skills, the better you’ll become.

Just make sure you’re staying safe by wearing appropriate PPE and paying attention while working. If you’d like to learn more about woodworking and its tools, check out the rest of our site. It’s full of in-depth reviews and guides just like this one.