Layout & Rules · 7 min read
T-square vs. rafter square vs. try square: which one does your shop need?
Three squares, three jobs. Compare a woodworking T-square, a rafter (speed) square and a try square for layout, crosscut marking and machine setup.
By SQUAREFORGE Shop Desk · Updated
Key takeaways
- A T-square is for long parallel and square lines across panels and sheet goods.
- A rafter square is the fastest way to mark 90° and 45° on boards and to guide a circular saw.
- A try square is the bench reference for checking edges, small parts and machine fences.
The short answer
| Square | Best at | Not great at |
|---|---|---|
| T-square / T-ruler | Panel layout, hole rows, parallel lines | Checking inside corners |
| Rafter (speed) square | Fast 90° and 45° marks, saw guide | Long lines and fine joinery |
| Try square | Checking edges, fences and small parts | Wide panels |
When a T-square wins
The head hooks over the edge of a panel, so every line you draw is square to that edge along the whole blade. T-rulers with pencil holes let you draw a line at an exact offset without measuring twice. This is the tool for shelf layouts, cabinet sides and drilling rows.
T-squares and T-rulers
500mm T-Ruler
300mm Ruler, 2 Guides
When a rafter square wins
A rafter square is a thick triangle with a lip. Hold the lip against the board edge and you get 90° and 45° marks in one motion. The lip also makes it a reliable fence for a circular saw crosscut. It lives in an apron pocket for framing, decking and rough breakdown.
Rafter squares
When a try square wins
A try square is the bench reference. Use it to check that a jointed edge is square to the face, that a table saw blade is at 90° to the table, or that a small part is cut true. A compact size fits inside boxes and drawers where bigger squares cannot.
Try and combination squares
200x130mm With Base
If you only buy one
For furniture and cabinet work, start with a try square for checking and add a T-ruler for layout. If you mostly break down lumber and build shop projects, a rafter square gives the most use per dollar.
Layout accuracy checklist
| Frequency | Tasks |
|---|---|
| Before a project | Check squares and rulers against a known reference |
| During layout | Reference every mark from the same face or edge |
| Periodically | Inspect tool edges for nicks that throw off registration |
/ Frequently asked
Is a speed square the same as a rafter square?+
Yes. Speed square is a common name for the triangular rafter square.
Can a T-square replace a try square?+
Not fully. A T-square is great for layout on panels, but a try square is better for checking edges and machine setups.
Aluminum or steel?+
Aluminum is light and will not rust. Steel is heavier and stiffer. Both work when the square is accurate.