7 Best Speed Squares for Framing and Woodworking

A speed square is a multi-purpose triangular carpenters’ tool used for marking out of square corners and do accurate measurements. It’s also known as a rafter square, rafter angle square, or triangle square.

Often considered to be the single most valuable measuring tool in carpentry and construction, speed squares not only allow for perfect 45 and 90 degree angles, they can also serve as a ruler and even a crosscut fence for your saw or router.

Due to their portability and versatility, having the best speed square possible is a must. Here are our top recommendations for this amazing tool.

Our 7 Favorites

	Product	Size	Material	Markings	Weight	Made
	Swanson S0101	7"	Aluminum	Etched	8 oz	USA
	Empire e2994	7"	Aluminum	Etched	9 oz	USA
	DeWalt DWHT46031	7"	Aluminum	Painted	8 oz	China
	Irwin Tools 1794463	7"	Aluminum	Painted	6 oz	China
	CH Hanson Pivot	9"	Aluminum	Etched	7 oz	Taiwan
	Johnson Johnny Square	7"	Aluminum	Etched	5 oz	China
	Swason Speedlite	8"	Polystyrene	Etched	3 oz	USA

Speed Square Reviews

#1 – Swanson S0101 7-Inch (w/ Blue Book)

Made in the USA and inexpensive are reasons enough why Swanson speed squares are so popular. This 7-inch mini speed square (a 12-inch version is also available) has plenty of features to ensure it becomes a permanent addition to your tool belt or job apron.

The square has common rafter and hip/valley rafter scales for better angle cuts or square cuts with one-number references, as well as a slot for 1/4 inch adjustable locking pin. A 62-page illustrated pocket reference book is included to help woodworkers make the correct angle cuts and to aid in building rafters, roofs, and stairs.

1/4 inch scribing notches and high visibility black gradations make this tool perfect for roofers while remaining useful for a wide range of other measuring tasks.

Swanson’s speed squares have been American-made exclusively for nearly a century now, and that consistency shows in their quality. Whether it’s the 7-inch or larger 12-inch version, owners are thankful for the sturdy aluminum construction and easy-to-read markings. Always look for the diamond cutout for genuine products of Swanson Tool Co.

The included Swanson Blue Book that will help you make accurate angle cuts is a welcome bonus to an already valuable tool and is one of the best around.

Every once in a while, a square will slip through QC with die casting flaws. This isn’t common, but it can affect measurements or readability in extreme cases. Also be warned that online ordering of tools always carries a chance of receiving a refurbished item, so always aim to purchase from a reputable merchant.

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#2 – Empire e2994 True Blue 7-Inch Rafter

This 7-inch aluminum speed square features high-visibility laser-etched markings to ensure superior readability in low light or after heavy abuse. Its durable anodized aluminum construction makes it resistant to rust and corrosion.

The SCRIBE-GUIDE precision notches make it easy to mark parallel lines, while the 15 percent wider heel width provides greater stability. Finally, the speed square includes common conversion tables and a link to the digital manual.

The user guide has quite a bit of good information on getting the most from this woodworking square. Owners find the blue color easy to locate and the high contrast markings for easy reading, while the edge is nice and straight for accurate lines. A larger 12-inch version is also available.

The only real downside to the e2994 is the lack of notches for anchoring to your circular saw or other power tool. A few consumers have expressed regret over the need to print the user manual if they want a physical copy.

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#3 – DeWalt DWHT46031 7-Inch

The extra-thick extruded aluminum body of this 7-inch speed square allows it to take a real beating. Add in a large base, and you have a tool that won’t slip when you’re marking materials or truing a cut.

Scribe line notches assist in marking rip cuts, and the stamped-in contrasting color gradations ensure easy readability.

When you need a speed square that will handle accidents, the DWHT46031 should be your first and last stop. Owners have suggested you could drop this thing from tall buildings, run over it, and it would still be as good as new.

While we’re not certain just how accurate these claims are, anyone who’s used this carpenter’s triangle can believe at least some of the stories.

The etched color feels more like they’ve been painted than etched to some users, and a few have reported scratches from shipping or use. The color also means this tool can soak up a lot of heat in sunlight, so be sure to keep it shaded.

A few users have also noted that the edges of this particular speed square can be rough on pencils.

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#4 – Irwin Tools 1794463 7-Inch Rafter

Sporting a blue aluminum body with permanent deep yellow stamped markings, this 7-inch wonder is rust-proof, weather resistant, easy to read and premium quality speed square.

The ruler includes  1/8, 1/10, 1/12, and 1/16 inch scales as well as rafter tables, brace and octagon scales, and Essex board measure on the hypotenuse. The sturdy construction is perfect for when you need a miter to cut angles reliably.

The high contrast markings make measurements both accurate and easy to read, much like many other speed squares. Many users reported the speed square feels more like steel than aluminum and is incredibly durable.

The included rafter layout guide is also a welcome addition for many consumers.

It should be noted that some sellers offer other colors, including a bare aluminum model. These variations have also been known to have poor paint jobs, resulting in chips that make markings harder to read.

Be sure to check with any seller to ensure you’re getting the right one to avoid potential issues.

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#5 – CH Hanson 03060 9-Inch Pivot Square

Okay, so we’re technically cheating here by listing a pivot square, but this sibling of the speed square can be a great alternative for those who need more focus on precise angle measurements.

A locking mechanism allows you to set a specific angle so you can mark multiple cut lines in either degree or roof pitches. Three UV-resistant spirit levels add improved accuracy when determining roof pitch, grades, and other leveling tasks.

Made of machined aluminum alloy, the 03060 is also an excellent choice for miter and plumbing cuts.

One of the most durable rafter squares on this list, the 03060 comes with a sturdy pouch, marking pencil, and an excellent technical guide on roof framing. The manual stands up to almost as much abuse as the square, and some owners have reported still being able to use the manual after years of spills and neglect.

As this tool is made to expand upon the angle functions of a speed square, the degrees can be paired against those of a protractor or digital clinometer with incredible accuracy.

Unfortunately, the locking mechanism doesn’t hold well for everyone, and some consumers  have reported it coming out of alignment when knocked. Also, the spirit vials are prone to the same flaws as any spirit level, especially the rare but frustrating change of an over- or under-filled tube.

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#6 – Johnson Level & Tool 1904-0700 7-Inch Square

Swanson may have invented the speed square, but Johnson reinvented it. The extruded aluminum body on this seven inch rafter square has CNC machined thick edge and laser etched graduation for superior readability and accuracy.

Johnson’s EX-Read finish diffracts light instead of reflecting it, creating an anti-glare coating that makes it equally easy to read in full sunlight or full shade while simultaneously creating more friction when used as a saw guide.

Scribing notches aid in ripping at either 3-1/2 or 5-1/2 inches and can measure two-by-four board dimensions of 1-1/2, 3, and 3-1/2 inches.

Owners of this tool truly appreciate the design efforts, especially the addition of five scribe slots instead of the usual three. Some versions are magnetic for even more control, and the markings are all easy to read.

The coating gives this tool a black appearance which can cause it to heat up when exposed to direct sunlight. Damaging the coating can also make the white markings harder to discern as the aluminum structure is exposed.

Also, while this tool is incredibly durable, a few customers have found the product can still be damaged on delivery (“Only a courier can break the unbreakable.” – Anonymous).

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#7 – Swanson Tool T0118 8-Inch Speedlite Square

When talking about speed squares, it’s only appropriate the conversation begins and ends with Swanson speed square. However, the speed square we’re finishing with breaks all the rules, and for good reason.

This particular speed square is an unusual eight inches and made of high impact polystyrene instead of metal. What gives?

Swanson created this plastic speed squares to be used on more delicate surfaces, such as glass, laminate, and siding. In fact, the eight-inch size is specifically intended for making cuts in eight-inch siding.

The beveled edge makes it easier to read, and the scribe line notches are spaces 1/8 inches apart. A center line guide aids in finding the center of round stock. You can even choose between a gentle matte grey or high visibility yellow or orange for the finish.

Despite the unusual choices, this speed square is still quite durable and the color options make it much easier to find. DIYers who’ve added the T0118 to their tool kit use it when a normal speed square is too rough on their materials.

A few manufacturing defects are more prone to occur with this tool due to the use of plastic instead of metal. This can include minor flaws in the edge and a little less chance of survival if dropped from extreme heights.

The markings can also be a little harder to read for some individuals than with high-contrast etched metal models. If your vision isn’t the best, the Stanley ABS speed square would be a better option if you need a plastic model.

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The Basics

Buying a speed square is an important step in any handyman’s life. These tools are used in all sorts of woodworking, although they’re best known for framing, roofing, and stair construction.

Here are a few common questions what will help when deciding on whether to invest in a speed square.

Speed vs Combination vs Framing Squares

These three common speed squares perform very similar tasks on the surface, but have unique specialties which make all three valuable additions to your workshop.

Combination squares combine a spirit level, ruler, and speed square into one convenient metal package. The head has fences at both 45 and 90 degree angles and can slide along the ruler blade, locking to ensure accurate marking lines. It’s used for laying out lines for crosscutting, notching, mitering, and ripping.

See Also:  Best Combination Squares for Fast Precision

Framing squares are large L-shaped tools (typically 16×24 inches) designed for laying out and checking larger structures. These squares feature detailed measurement tables and markings on both inside and outside edges with 1/8, 1/10, 1/12, and 1/16 inch increments.

They excel at complex rafter and stair calculations, providing specialized tables for hip, valley, and jack rafters as well as stair stringers. The longer arm (body) and shorter arm (tongue) work together to verify square corners on larger workpieces.

Speed squares are shaped as a right triangle with one 90-degree angle and two 45-degree angles. The distinctive triangular shape with a lipped edge allows them to serve multiple functions while providing accurate angle measurements.

They can be used as a saw guide, line scriber, protractor, roof pitch finder, framing square, stair layout tool, and more. The flange or foot allows you to butt the tool securely against the edge of your work piece for consistent measurements..

What Size Should You Get?

Speed squares are available in several sizes to suit different needs.

While 7-inch and 12-inch models are the most common and widely used, manufacturers also offer 6-inch mini squares for tight spaces and smaller work, 8-inch versions (like the Swanson T0118 mentioned above) designed specifically for siding work, and even 10-inch squares for certain applications.

You should choose the size that best suits your typical projects and working style.

Related:  Best Tape Measures for DIY and Professional Use

How to Use

Basic Components

Speed squares have a foot/lip/flange on one straight side which you can use to butt up against the material you’re measuring. The other straight side has a ruler with at least one set of markings.

A point at one end of the lip is known as the pivot and allows you to measure various angles. As for the hypotenuse (long end), you can find a wide array of markings, including degrees and other units important for roofing.

Understanding the Markings

The hypotenuse (long edge) of most speed squares contains two distinct measurement systems: degree measurements (typically from 0-90°) for general angle work, and rafter/roof pitch markings (displayed as inches of rise per foot) specifically for roof framing.

Understanding both marking systems allows you to tackle a wide range of projects from basic miter cuts to complex roof layouts. Additional scales for determining hip/valley rafter lengths and common rafter calculations are also included on most models.

Making Angle Measurements

The flange is your best friend, allowing you to use the speed square as a miter or hold it firmly against a board. By holding the pivot point, you can turn the square to find the proper angle along the hypotenuse and mark that angle in mere seconds.

By holding the pivot point (the corner where the flange meets one edge of the square), you can rotate the tool while keeping the pivot firmly against your workpiece. This allows you to swing the hypotenuse to find the desired angle, read the measurement directly from the degree or pitch scale, and mark that angle in seconds.

This pivoting function is what gives the speed square its versatility and allows for quick angle layout without the need for additional tools.

Multiple Functions

Using the flange, your speed square also becomes a miter at the corner of the hypotenuse and a try square at the 90 degree corner.

There are plenty of additional nuances to your speed square that are detailed in the manual included with your model, but these basic techniques are a great starting point.

Care and Maintenance Tips

Keeping your speed square in top condition helps ensure accurate measurements for years to come. Here are a few maintenance tips to extend the life of this invaluable tool.

Cleaning and Storage

Always wipe your speed square clean after use, especially when working with treated lumber or in dusty conditions. A simple wipe with a dry cloth is usually enough, though you may need to use a mild detergent solution for stubborn residue. Never use harsh chemicals as these can damage the markings over time.

Store your speed square in a dry place, preferably hanging on a pegboard or in a tool belt pocket rather than tossed in a toolbox where it might get damaged. Some craftsmen prefer to drill a small hole in a non-essential area for easy hanging.

Checking for Accuracy

Like other precision measuring tools, even the best speed squares can become inaccurate over time due to drops or impacts. Periodically check yours by drawing a 90-degree line, then flipping the square and drawing another line from the same point. If the lines don’t perfectly overlap, your square may need replacing.

For checking the 45-degree angle, draw a perfect square, then use your speed square to draw a diagonal line from corner to corner. The line should pass perfectly through the opposite corner.

Protecting the Markings

The graduations and markings are what make your speed square valuable. Apply a thin coat of clear lacquer or protective finish to aluminum squares if you notice the markings beginning to fade.

For plastic models, avoid prolonged exposure to sunlight, which can degrade both the material and visibility of markings.

Dealing With Damage

If your speed square gets dropped and develops a ding or burr on an edge, carefully file it smooth with a fine metal file. Work slowly and check your progress frequently to avoid removing too much material. Even tiny damage to the flange or straight edges can affect accuracy.

Scratches on the face of the tool generally don’t affect functionality unless they obscure important markings. If markings become unreadable, it’s usually best to replace the tool rather than attempt repairs.

Common Mistakes to Avoid

Even experienced users can make errors when using speed squares. Here are some common mistakes to look out for:

• Improper Flange Positioning – Not seating the flange firmly against the edge of your material can lead to inaccurate angle measurements. Always make sure that the entire length of the flange makes solid contact.
• Confusing Degree Markings with Pitch – Many beginners mix up the standard degree markings (0-90°) with the roof pitch markings (inches of rise per foot). Double-check which scale you’re reading for your specific application.
• Using the Wrong Size for the Job – Trying to measure angles on a 2×10 with a 7-inch square can be frustrating and inaccurate. Match your square size to your material for best results.
• Marking Without Supporting the Square – When marking lines, keep firm pressure on the square to prevent slipping, especially when working with a pencil that might catch on the edge.
• Ignoring Calibration – Assuming your speed square is perfectly accurate after it’s been dropped or damaged can lead to compounding errors in your project.
• Misreading Notches – The scribe notches serve specific purposes; using the wrong notch for marking can throw off measurements by fractions of an inch.
• Forgetting Material Thickness – When using a speed square to guide a circular saw, remember to account for the saw’s blade thickness and the offset of the saw base.
• Poor Maintenance – Allowing sawdust and debris to build up in the corners and notches can affect accuracy over time.
• Using as a Hammer – Yes, people do this. Your speed square is a precision measuring tool, not a striking instrument or pry bar.
• Ignoring the Manual – Those included booklets contain valuable information specific to your model. Many woodworkers never read them and miss out on advanced techniques.

Have any other tips? Leave a comment below.