Every serious carpenter, woodworker, or weekend DIYer eventually encounters a problem that a plain tape measure and a pencil can’t solve: how do you lay out a perfectly angled rafter cut, mark a crisp 45-degree line, or scribe a parallel line along a warped board in under ten seconds? The answer has been sitting in toolboxes for over a century in the form of the humble Speed Square, but the real secret weapon is the small, dense booklet that ships with it—the Swanson Little Blue Book. This compact instruction manual transforms an already versatile layout tool into a comprehensive framing companion, yet a surprising number of owners never open it, misplace it, or simply don’t know where to find a replacement. This article is an exhaustive guide to securing the Swanson Little Blue Book for free, understanding every technique it teaches, and deciding which modern Speed Square deserves a place in your kit.
From locating legitimate free download sources to decoding the rafter scale, hip-valley markings, and protractor features, this deep-dive covers everything a homeowner, contractor, or hobbyist needs to maximize the utility of their layout tools. We also examine five of the most popular Speed Squares on the market today, comparing build quality, price, and included documentation to help you make a confident purchase that won’t leave you hunting for instructions later.
TL;DR: The Ultimate Speed Square Companion Guide
For those in a hurry: the Swanson Little Blue Book is a copyrighted instruction and technique manual that ships free with every genuine Swanson Speed Square. While official free digital downloads are not consistently hosted on Swanson’s website, complete PDF scans circulate through public library archives like the Internet Archive, and physical copies arrive with any new square you purchase. If you need the book today, we recommend buying a legitimate Swanson Speed Square—which includes the book in the box—or printing an archived scan from a reputable public library source.
Below is a quick comparison of the five products featured in this guide, ranging from budget-friendly alternatives to pro-grade kits.
| Product | Key Features | Price | Rating | Action |
|---|---|---|---|---|
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Swanson Speed Square Pro 7″ — Made in USA, black embossed scales/degrees/scribing, includes new pro-specific user guide | $14.98 | 4.8 (1,300+) | Buy at Amazon |
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SWANSON SW1201K Value Pack — 7″ + 12″ heavy-gauge aluminum squares, ships with Blue Book | $16.50 | 4.8 (10,200+) | Buy at Amazon |
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SWANSON S0101 7″ Speed Square, Blue — Original classic, aluminum alloy, black embossed scales/degrees/scribing | $9.98 | 4.8 (17,200+) | Buy at Amazon |
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7 Inch Aluminum Rafter Square — Double-sided engraved scales, precision carpentry, woodworking, roof pitch & angle marking | $5.99 | 4.6 (245) | Buy at Amazon |
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Aluminum Alloy Rafter Square 7″ Red — Laser-etched scale, carpenter’s layout tool, multi-angle protractor | $7.99 | 5.0 (1) | Buy at Amazon |
What Is the Swanson Little Blue Book?
The Little Blue Book is a pocket-sized instruction manual written by the engineers and carpenters behind the Swanson Speed Square. First introduced alongside the original aluminum Speed Square in the 1960s, this booklet has walked generations of tradesmen through the two dozen or more distinct functions of what is often called “the carpenter’s best friend.” The book’s real value lies in its brevity and directness: it doesn’t just describe the tool’s anatomy, it shows you exactly how to mark common rafters, hip rafters, valley rafters, stair stringers, angle cuts, and parallel lines, with simple diagrams that make advanced geometry feel approachable.
For the uninitiated, the Speed Square itself has three primary faces: a triangular body with a 90-degree corner, a raised lip or fence along one edge for locking against a board, and a pivot point at the corner where a pencil can be held to sweep angles. The Little Blue Book takes these physical features and translates them into practical procedures that cover over 30 different layout tasks. It also contains handy reference charts for board feet, rafter lengths, and even metric conversion factors. In short, it is the ultimate cheat sheet for anyone who wants to master the tool rather than simply use it as a straightedge.
The booklet measures roughly 4 by 6 inches, which is why it disappears so easily in a cluttered toolbox or a truck cab. Losing it is common, but replacing it is not always as simple as a quick web search. This leads to the most frequent question among DIYers: where can you find a free download of the Swanson Little Blue Book?
Free Download Options: Getting the Little Blue Book Without Buying a New Square
There are several legitimate routes to obtaining a free copy of the Swanson Little Blue Book, though each comes with caveats involving file quality, completeness, and copyright. Below is an exhaustive breakdown of the options currently available.
The Official Swanson Route
Swanson Tool Co. historically includes a printed Little Blue Book with every genuine Speed Square, and its website offers product manuals and specification sheets for current models. However, a full, official PDF version of the classic Little Blue Book is not always publicly hosted on the Swanson domain; the company tends to treat the booklet as a physical premium. Occasionally, Swanson’s official website provides downloadable “user guides” for newer products like the Speed Square Pro, so checking the product page is worthwhile. If you own a Swanson square and need a replacement booklet, you can also contact Swanson customer service directly—some users report receiving a fresh copy by mail for the cost of postage, though turnaround times vary.
Internet Archive and Public Library Scans
The Internet Archive (archive.org) is arguably the most reliable free resource for a PDF scan of the Swanson Little Blue Book. Multiple scans exist in its digital library, uploaded by users and preservation groups, and they can be searched by keywords such as “Swanson Little Blue Book” or “Speed Square instructions.” Because the Internet Archive treats these scans as archival documents, they are typically high-resolution and paginated in order. Public library systems with digitized trade instruction collections occasionally host similar scans as well. These are the closest things to a legitimate free download, and they present no malware risk, unlike random file-sharing sites.
PDF Scan Repositories and Woodworking Forums
Woodworking forums such as Garage Journal, WoodNet, and the Fine Homebuilding breaktime forums frequently host attached PDF copies of the Little Blue Book. Likewise, general PDF repository sites like Scribd and DocDroid sometimes carry user-uploaded versions of the scan. Searching for exact phrases such as “Swanson Little Blue Book filetype:pdf” or “Speed Square manual PDF” will surface a variety of hits. The main risk here is file quality: some uploads are blurry scans of photocopied booklets, missing pages, or stripped of the folding charts that make the physical booklet so useful. Always inspect the PDF’s page count and a preview of the first few pages before committing bandwidth to a download.
A Note on Copyright and Authenticity
The Swanson Little Blue Book is a copyrighted publication, and Swanson Tool Co. has been protective of its instructional content over the years. Downloading a scan from an unofficial source occupies a gray area, but accessing a scanned copy for personal educational use is generally tolerated as long as you don’t redistribute it or use it for commercial gain. The most responsible approach is to purchase a genuine Swanson Speed Square, which includes the booklet in the package, or to consult an archival copy via a public library portal. For those in a hurry, though, a forum-hosted PDF will get you the same rafter charts and angle tables that professionals have relied on for decades.
Understanding the Core Mechanics of a Speed Square
Before diving into the specific techniques taught in the Little Blue Book, it is essential to understand the physical parts of a Speed Square and why each one exists. The tool is an isosceles triangle, typically molded or machined from a single piece of aluminum alloy, with a flat reference edge and a raised lip known as the fence. The fence is critical: it allows the square to lock against the edge of a board while the body stays perpendicular in one plane, ensuring that any line drawn along the hypotenuse or the straight edge is square to the material.
The top of the square features a pivot point located at the junction of the fence and the hypotenuse. Holding a pencil at this pivot and rotating the square along the board’s edge turns the entire tool into a continuously adjustable protractor, with degree markings printed along the hypotenuse. The front face carries the rafter scale—a chart of numbers from 1 to 12 that correspond to roof pitch—while the back face often includes a scribing notch for marking lines parallel to an edge, as well as inch and half-inch scales for quick measurements.
There is a reason the design has barely changed since Albert Swanson invented it in 1925: the geometry is efficient. The square simultaneously solves for the right angle, the 45-degree mitre, and any arbitrary angle via the pivot, meaning a carpenter can mark, cut, and verify in a fraction of the time required with a framing square and a protractor. The Little Blue Book exists to make sure nobody forgets the breadth of this utility.
How to Use the Little Blue Book: Key Techniques Decoded
The Little Blue Book is organized as a sequential course in layout work, starting with simple lines and building up to complex rafter assemblies. If you are using a PDF copy or a fresh physical booklet, the first exercises to master are the basic lines, then the angle table, and only then the rafter scale.
Finding Angles in Seconds
The most famous trick in the Little Blue Book is the pivot-and-sweep method for drawing any angle. Place the fence against the board’s edge, press a pencil tip into the pivot point, and rotate the square until the desired degree mark aligns with the board’s edge. Then drag the pivot point along the board while keeping the pencil in the pivot, and the hypotenuse will trace the exact angle. This technique works for angles from 0 to 90 degrees and is the same method used to lay out mitre cuts on crown moulding or stair stringers. The book emphasizes holding the pencil firmly and maintaining constant pressure on the fence to avoid drifting lines.
Laying Out Common Rafter Cuts
The rafter scale is the most intimidating part of the Speed Square for beginners, and the Little Blue Book walks through it step by step. For a common rafter, the carpenter first determines the roof pitch—say, a 6/12 pitch, meaning six inches of rise for every twelve inches of run. Using the rafter scale on the front face, the carpenter pivots the square until the number 6 aligns with the board’s edge, then marks the cut line along the hypotenuse. This instantly gives the plumb-cut angle for the rafter’s top end. The same alignment applied from the other direction yields the seat cut or bird’s mouth, which is then laid out using a combination of the square’s lip and the pitch mark. The Little Blue Book includes a rafter length table so that you can derive the exact length of a rafter without arithmetic or a separate framing square.
Hip and Valley Rafter Layout
Hip and valley rafters are geometrically more complex because they involve compound angles. The Little Blue Book dedicates multiple pages to this task, explaining that a hip rafter requires a different rafter scale reading based on the ratio between the common rafter run and the diagonal run of the hip. The book provides correction charts that adjust the pitch mark for hip and valley locations, preventing the classic mistake of cutting a hip rafter at the same angle as a common rafter and ending up with a poor-fitting joint. For most DIYers, this is the chapter that justifies the time spent studying the booklet; it converts a mathematically intimidating task into a simple table look-up.
Using the Rafter Scale for Stair Stringers
Beyond roofing, the rafter scale doubles as a stair-layout tool. The Little Blue Book shows how to set the square to the desired tread-to-riser ratio and then scribe the plumb and level cuts along a 2×12 stringer. By sliding the square down the board in consistent increments, a carpenter can lay out an entire stringer in minutes. The book’s stair tables cover rises from 6 to 8 inches and runs from 8 to 12 inches, which covers virtually all residential stair geometry. This technique alone can save hours of trial-and-error cutting.
Speed Square Showdown: Comparing Top Options
Because the Little Blue Book ships with genuinely certified Swanson tools, your choice of Speed Square directly affects whether you receive the booklet, a newer pro guide, or nothing at all. To help you decide, we compared the five products promoted in this guide side by side.
| Feature | Swanson Speed Square Pro 7″ | SWANSON SW1201K Value Pack | SWANSON S0101 Blue Speed Square | 7 Inch Aluminum Rafter Square | Aluminum Alloy Rafter Square (Red) |
|---|---|---|---|---|---|
| Brand | Swanson | Swanson | Swanson | Generic | Generic |
| Size | 7″ | 7″ + 12″ combo | 7″ | 7″ | 7″ |
| Material | Aluminum alloy | Heavy-gauge aluminum | Aluminum alloy | Aluminum alloy | Aluminum alloy |
| Markings | Black embossed | Black embossed | Black embossed | Double-sided engraved | Laser-etched |
| Includes Little Blue Book | Pro-specific user guide (not classic Blue Book) | Yes, ships with Blue Book | Yes (classic booklet in box) | No | No |
| Made in USA | Yes | Yes | Yes | No | No |
| Best For | Pros needing advanced guide | Serious DIYers wanting both sizes | Purists who want the original | Budget-focused beginners | Light-duty layout |
| Price | $14.98 | $16.50 | $9.98 | $5.99 | $7.99 |
| Rating | 4.8 / 5 | 4.8 / 5 | 4.8 / 5 | 4.6 / 5 | 5.0 / 5 |
| Action | Buy at Amazon | Buy at Amazon | Buy at Amazon | Buy at Amazon | Buy at Amazon |
The first major distinction is between the genuine Swanson products and the generic alternatives. The Swanson Speed Square Pro 7″ offers black embossed scales and a new pro-specific user guide, but it does not include the classic Little Blue Book. For those who want the full learning experience bundled with the tool, the SWANSON SW1201K Value Pack is the strongest proposition because it includes two squares and the Blue Book, and the SWANSON S0101 Blue Speed Square also ships with the classic booklet as part of its traditional package. Among the generic tools, the 7 Inch Aluminum Rafter Square and the Aluminum Alloy Rafter Square (Red) deliver surprisingly accurate engravings for the price but omit any instructional booklet, so you will need a free PDF download to get started.
Which Speed Square Should You Buy? A Practical Buyer’s Guide
The correct answer depends entirely on your skill level, the frequency of your framing work, and whether you value the included documentation. Here is a direct recommendation for each profile of user.
For the Professional or Serious Contractor: Swanson Speed Square Pro 7″
If you frame houses, build decks, or install roofing on a daily basis, the Swanson Speed Square Pro 7″ is the top pick. The black embossed scales are recessed into the aluminum rather than painted on the surface, so they survive years of abrasion without wearing away. The new pro-specific user guide covers the advanced techniques that professionals actually use on the job site, and the 7-inch size is the versatile sweet spot for everything from rafter layout to drywall cutting. At $14.98 with more than 1,300 ratings averaging 4.8 stars, this is a reasonable investment for a tool that will outlast a dozen tape measures.
For the DIY Homeowner Who Wants Everything: SWANSON SW1201K Value Pack
The SWANSON SW1201K Value Pack is the ultimate starter bundle. It pairs the standard 7-inch square with the larger 12-inch “Big 12” square, giving you the agility of a compact tool and the long-reach accuracy of a bigger one. Because the kit ships with the actual Little Blue Book, you receive the full educational package immediately, without having to search for a PDF. With over 10,200 ratings and a 4.8-star score, this kit is the most popular product in this group, and the $16.50 price is a bargain for two qualified tools plus documentation.
For the Purist and the Budget-Conscious Professional: SWANSON S0101 Blue Speed Square
The classic SWANSON S0101 7″ Speed Square is the direct descendant of the original 1925 invention. It uses the traditional blue finish with black embossed scales, and it comes with the Little Blue Book in the box. More than 17,200 raters have pushed its average to 4.8 stars, making it the most-reviewed layout tool in this guide. At $9.98, it is the best value among the genuine Swanson products and an ideal choice for anyone who wants an authentic experience without the bulk of the 12-inch square.
For the Weekend Warrior on a Strict Budget: Generic 7-Inch Squares
If you only need to mark a few 90-degree lines or cut bird’s mouths on a single shed roof, the 7 Inch Aluminum Rafter Square at $5.99 and the Aluminum Alloy Rafter Square (Red) at $7.99 provide serviceable precision. They are not manufactured in the USA, and they do not include the Little Blue Book, so you will need to download a free PDF copy from one of the sources listed earlier. The generic tools are lightweight, reasonably accurate, and fine for occasional shop use, but the aluminum alloy is typically slightly softer than Swanson’s material, meaning the edges may round over sooner if you use the square as a saw guide.
Expert User Tips Beyond the Little Blue Book
The Little Blue Book covers the fundamentals, but experienced framers have developed a few tricks that never made it into the official manual. Here are the most valuable undocumented tips for getting more from any Speed Square.
Use the Square as a Circular Saw Guide
The raised fence on the Speed Square is thick enough to ride against the base of a circular saw, making the square a stable guide for straight crosscuts. Position the square with the fence pressed firmly against the board’s edge and the saw base sliding along the square’s body. This works best for short cuts up to about 12 inches wide; for longer cuts, clamp the square to the board or use a dedicated straightedge. The trick is to always keep the saw’s base plate flush against the square body, and to use a fine-tooth blade for a clean, chip-free edge.
Scribe Parallel Lines with the Notch
Many Speed Squares feature a small scribing notch along the fence on the back face. Place the fence against the board’s edge, insert a pencil lead into the notch, and slide the square along the board. The notch creates a line that is exactly the same distance from the edge as the notch’s offset, which is typically 1/8 inch or 1/4 inch. This is the fastest way to mark a consistent reveal for paneling, trim, or dados.
Lock Angles for Repetitive Cuts with a Square Dial
If you need to repeat the same angle across a dozen boards, avoid re-pivoting the square for every piece. Instead, set the square to the angle, then clamp a small stop block or a piece of painter’s tape at the pivot contact point on the board edge. Slide the square against the stop for each subsequent cut, and every line will match the first one exactly. This technique is especially useful for stair stringers and mitred trim.
Check the Square Before Every Purchase
A pressed aluminum Speed Square can lose its perfect 90-degree corner if dropped onto concrete. To verify a square’s accuracy, place it against a known straight edge and draw a line, then flip the square over and draw the same line again. If the two lines diverge, the square is out of calibration. The Swanson products listed in this guide are manufactured to tighter tolerances than generic alternatives, which is another reason professionals prefer them.
Final Verdict
The Swanson Little Blue Book remains the single greatest source of knowledge for owners of the Speed Square, regardless of whether you obtain it as a free PDF scan from a library archive or as a physical booklet tucked inside a new tool. Its rafter tables, stair charts, and angle techniques have not changed in decades because the math behind them never changes. For that reason, we strongly recommend purchasing one of the genuine Swanson models above, as they provide both a precision tool and instant access to the book on which the entire Speed Square legacy is built.
If forced to make a single choice, the SWANSON SW1201K Value Pack offers the strongest combination of value, versatility, and included documentation. The Swanson Speed Square Pro 7″ is the best upgrade for professionals, while the SWANSON S0101 Blue Speed Square remains the classic budget favorite. For those who simply need a cheap square for occasional projects, the generic 7 Inch Aluminum Rafter Square and Aluminum Alloy Rafter Square (Red) will handle light duty without strain.
In the end, a Speed Square is only as capable as the person using it. Download the Little Blue Book, study the rafter chart, and apply the techniques to your next project. What once seemed like a simple triangular piece of aluminum will reveal itself as the most versatile layout tool in your toolbox.