Last updated: 16/10/2022

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Whether in the school environment or office article, if you need to measure something quickly or draw a straight line, a ruler is what you need. Used in geometry, rulers are ideal for making small measurements, usually in centimetres and millimetres.

And if you deal with paper cutting, you may have already used a ruler for quick, convenient and clean cutting. So, if you need a good ruler to assist you in your school life or for your work, today you can find a lot of ruler options. Check out our review to find the right ruler for you.


  • The most common rulers on the market have measures of 15, 30 or 60 centimeters.
  • Today you can find rulers of various types of material, some even flexible, which makes them more practical and resistant.
  • Some rulers offer geometric shapes or hollow letters to help you get firmer strokes or create drawings in custom calligraphy.

The Best Ruler: Our Picks

Buying Guide

Extremely versatile, rulers accompany us for long periods in our lives, either in the school environment and then, as adults, in the workplace. Whether to make simple measurements, to achieve perfect lines or to help you in big technical projects, check our Buying Guide to know how to choose the best ruler for you or for that office friend of yours who is always grabbing your ruler.

Imagem de pessoa utilizando uma régua de plástico azul com um lápis preto e vermelho para traçar uma linha em uma folha de papel branco.

With a ruler you are able to get much more perfect traces (Source: sweetlouise / Pixabay)

What is a ruler?

Rulers are geometric instruments developed for measuring small distances or for drawing perfect lines. For a good while, each country had its own scales of measurement, usually inspired by parts of the body, such as feet tall or palms. Today most countries have adopted the international standard of weights and measures, where the scale of measurement is in centimetres and millimetres.

Did you know that there is archaeological evidence that ivory rulers were used since ancient times in the Indus Valley?

Today rulers come in a variety of shapes and sizes and are one of the most common items among school supplies or office supplies, as they are practical and can be used for a multitude of jobs.

What are the different types of rulers?

There are three main types of rulers available in the market today. School rulers are cheaper and are suitable for children and teenagers. The flexible rulers are a little more expensive, but much more resistant. And we also have the technical rulers, ideal for use in engineering and architecture. To understand a little better about each type of ruler and its indications for use, check our comparative table below.

School ruler Flexible ruler Technical ruler
Indications for use Ideal for children and adolescents in school phase Perfect for children, because they can be twisted without breaking They are more technical models and indicated for professional use
Resistance Generally they are less resistant Their material can be twisted, which makes them more resistant and durable Technical rulers are more resistant models
Price They are the cheapest rulers on the market They can be found in an intermediate price range These models usually cost more

Purchase Criteria: Factors to consider before buying a ruler

With so many models of rulers available on the market, you may feel a little lost about which model is ideal for your work or to put in your children’s school supplies. To understand a little better about rulers, we have separated some important criteria that can determine which is the ideal ruler for your needs.

  • Size
  • Type of scale
  • Material
  • Use

Check carefully each one of these items in detail in the section below so that you can choose the ruler that offers the best cost/benefit, resistance and durability.


The rulers can be found in different sizes and you can choose according to the use that you will have for them. The most normal models vary between 15, 30 and 60 centimetres. It is also possible to find larger rulers, especially for professional use, such as for engineering projects, architecture or technical drawings. You can also find folding rulers, which offer a larger size while being easier to store, as they take up less space.

Scale types

On technical rulers you can find more options, such as measuring inches, decameters or metres. Before you choose the right ruler, make sure you are buying a model that offers the measurements you need. This tip is especially valuable for those who use the ruler at work and may need other units of measurement.


Imagem de régua dobrável branca de madeira com medição em centímetros e milímetros sobre bancada de madeira.

The rulers can be found in various materials, such as this folding wooden ruler used in construction (Source: fotoblend / Pixabay)

It is possible to find rulers made of an infinite number of materials. The oldest models were produced from ivory, metal or different species of wood. Today, with the advancement of technology and materials, most rulers are made of plastic, such as PVC.

Wood has been replaced by MDF, a cheaper and lighter material. It is also possible to find flexible rulers, produced in plastic alloys or light metals, making them more resistant and durable. For technical drawing, there are also acrylic rulers.


Imagem de régua técnica de plástico transparente com caneta tinteiro e calculadora digital sobre papel quadriculado branco.

With a technical ruler you can realize projects with much more accuracy (Source: NjoyHarmony / Pixabay)

The rulers are ideas for drawing straight and firm strokes, making them very useful for drawing graphs and tables. Some models also offer letters and geometric shapes to facilitate their use for calligraphy or algebra exercises.

For a more professional use, as in engineering projects, architecture or for technical drawings, some rulers even have built-in calculators. Knowing the reason of use will determine the type of ruler that you need to buy, taking into account all the tips that you received in this guide.

Image source: Wokandapix / Pixabay