How to Buy the Right Protractor for Your Needs

Your Guide to buying the best Protractors


A protractor is an essential tool for anyone who needs to measure, draw, or construct angles. It is a simple device comprised of a ruler with two arms that meet at a single pivot point, allowing users to measure angles in both degrees and radians. This buying guide offers advice for selecting a protractor as well as providing reviews and advice on the different types of protractors available. We’ll discuss the features to consider when selecting a protractor, assess the advantages and disadvantages of the different types of protractors, examine the different brands of protractors on the market, and provide guidance on the best practices when using protractors. With this guide, you’ll be able to find the perfect protractor for your needs.

Key features

  1. Accuracy - Look for the accuracy rating of a protractor; it should have measurements that are precise and reliable.
  2. Durability - Make sure to pay attention to the construction of the protractor and how durable it may be.
  3. Type - Consider which type of protractor will best serve your needs; regular, half-circle, or square.
  4. Size - Measure protractor sizes to ensure you purchase the right size for your project, large or small.
  5. Material - Determine the material that best fits your needs, such as plastic, metal, or wood.
  6. Price - Compare prices to determine the best value for your budget.
  7. Accessories - Consider what other accessories are available; for example, a protractor set with a ruler or other tools.

See the most popular Protractors on Amazon

Important considerations


  • Accuracy - Protractors are designed with a high level of accuracy and precision to ensure that measurements are as accurate as possible.
  • Convenience - Protractors are lightweight and portable, making them easy to use in any work environment, from classrooms to construction sites.
  • Durability - Protractors are made of durable materials that can withstand the rigors of daily use.
  • Multi-Purpose - Protractors are not only used for measuring angles, but can also be used to measure circles, lines, and other shapes.
  • Versatility - Protractors are designed to be used in a variety of ways, such as for drawing, measuring, and calculating angles.


  • Accuracy Concerns: Some protractors may not provide 100% accurate angle measurements due to manufacturing flaws or wear-and-tear.
  • Difficult to Read: Using a protractor can be difficult if the numbers are hard to read.
  • Durability: Protractors may be prone to breakage if dropped or mishandled.
  • Price: Some protractors may be expensive depending on the accuracy or features included.
  • Physical Limitations: Protractors can only measure angles up to 180 degrees, so they may not be suitable for measuring larger angles.

Best alternatives

  1. Rulers - Straight edge rulers come with many markings and features that you can use to make measurements and draw straight lines. Some specialty rulers even have protractor markings.
  2. Folding Rulers - Folding rulers are thicker and sturdier than straight edge rulers, and can be used to measure longer distances. Some models also include protractor markings.
  3. Compasses - Compasses are used for drawing circles and arcs and include a hinge that allows you to adjust the radius. Some compasses also include protractor markings.
  4. Angle Measurement Tools - Angle measurement tools are designed specifically for measuring and drawing angles. They come in a variety of shapes and sizes and many have protractor markings.

Related tools, supplies, and accessories

  • Protractor - A tool used for measuring angles
  • Ruler - A tool used for measuring length
  • Compass - A tool used for drawing circles and arcs
  • Set Square - A tool used for drawing perpendicular lines
  • Pencil - A writing tool used to draw and measure
  • Pen - A writing tool used to draw and measure
  • Eraser - A tool used to erase mistakes
  • Protractor Caliper - A tool used to measure the size of angles
  • Protractor Level - A tool used to measure angles in a level position

Common questions

  1. What types of protractors are available? Protractors come in various types, including flat, semicircular, and circular. Flat protractors are typically used for drawing angles, semicircular protractors measure angles between 0 and 180 degrees, and circular protractors measure angles between 0 and 360 degrees.
  2. What are the key features to consider when buying a protractor? Key features to consider when buying a protractor include the type of protractor (flat, semicircular, or circular), accuracy (how precise the tool is), material (plastic or metal), and size (length of the arm).
  3. What is the best way to use a protractor? The best way to use a protractor is to line up one of the zero degree marks with one side of the angle, then use the arm to measure the angle.
  4. What is the difference between a protractor and a compass? The main difference between a protractor and a compass is that a protractor is used to measure angles, while a compass is used to draw circles.


An interesting fact about protractors is that they were originally used to measure angles in the sky. Astronomers in the 1600's used them to calculate the position of stars and constellations. This was before more sophisticated tools like telescopes were invented. Protractors are still used in astronomy today, although in a more limited capacity. Source

Disclaimer: This buying guide was not created by humans, and it is possible that some of it's content is inaccurate or incomplete. We do not guarantee or take any liability for the accuracy of this buying guide. Additionally, the images on this page were generated by AI and may not accurately represent the product that is being discussed. We have tried to convey useful information, but it is our subjective opinion and should not be taken as complete or factual.