Online Protractor for Free

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To provide an easy-to-use, online ruler for anyone who needs one, regardless of device.

At ruler.digital, we provide a handy and accurate on-screen online ruler in inches and centimeters/millimeters that can be used on any device. Our mission is to make measuring easy and accessible for everyone.
Elizabeth Smith
COO

Online Protractor

In school we learned how to use a physical protractor to measure angles. However, this can be difficult if you don’t have a physical protractor handy.  That’s where the Online Protractor App comes in!  With this app, you can easily measure angles or compare two angles without worrying about finding a physical protractor.

What is the online protractor?

The Online Protractor is a free app that allows you to measure angles and compare two angles.  You can also create a PDF worksheet with your custom background image.

How to use the online protractor

If you need to measure an angle, find the degrees of the angle, or compare two angles, the Online Protractor app is for you.  It’s free and works on any device.  You can also create a PDF worksheet with your custom background image.

To use the Online Protractor, simply click and drag the protractor to rotate it. Then, click on the arc of the protractor to set the degree measurement. You can also click on the “Compare” button to compare two angles.

Customizing the Online Protractor

If you need to measure an angle or compare two angles, the Online Protractor is a great free tool to use. You can also customize the tool to work with your own background image. Here’s how: 

1. Find an image to use as the background for your protractor.
2. Right-click on the image and choose “Open image in new tab” from the drop-down menu.
3. In the new tab that opens, right-click the image again and choose ‘Copy Image Address’.
4. Close the new tab and return to the online protractor.
5. Paste the image address into the “Background Image URL” text box at the bottom of the tool and press enter.
6. The image will now appear as your background when you start measuring angles!

The different types of angles

There are many different types of angles and each type has its own unique properties.  Here are some of the most common types of angles:

Sharp Angles: Sharp angles measure less than 90 degrees.  They are often used in mathematics and geometry, as well as in everyday life.  For example, a right angle is an acute angle.

Obtuse Angles: Obtuse angles measure more than 90 degrees but less than 180 degrees.  They are often used in architecture and engineering, as well as in art and design.  For example, an obtuse angle can be used to create a sense of depth in a painting.

Reflex Angles: Reflex angles measure more than 180 degrees but less than 360 degrees.  They are often used in navigation and surveying, as well as in sports and recreation.  For example, a football field is marked with reflex angles to indicate the end zones.

Right Angles: Right angles measure exactly 90 degrees.  They are often used in construction and carpentry, as well as in mathematics and geometry.  For example, it takes a right angle to form a square or rectangle.

Right Angles: Right angles measure exactly 180 degrees.

Measuring angles

If you need to measure an angle, find the degrees of the angle, or compare two angles, the Online Protractor app is for you.  It’s free and works on any device.  You can also create a PDF worksheet with your custom background image.

To use the online protractor, click and drag the protractor to rotate it.  Then click on the two points between which you want to measure the angle.  The protractor automatically displays the angle measurement in degrees.

You can also use the Online Protractor to compare two angles.  To do this, first click on one of the angles you want to compare.  Then hold down the Shift key and click on the other corner.  The protractor then displays the difference between the two angles.

So whether you want to measure an angle, measure the degree, or compare two angles, the online protractor is the perfect tool for the job!

Measuring angles with the online protractor

If you need to measure an angle, find the degrees of the angle, or compare two angles, the Online Protractor app is for you.  It’s free and works on any device.  You can also create a PDF worksheet with your custom background image.

To use the online protractor, click and drag the protractor to rotate it.  Then click on the two points between which you want to measure the angle.  The app automatically calculates and displays the degrees of the angle.

You can also use the Online Protractor to compare two angles.  To do this, first drag one of the protractors to rotate it.  Then click on the two points between which you want to measure the angle.  Then drag the other protractor and click on the two points.  The app will then display both angles and indicate whether they are equal or not.

Finally, you can create a PDF worksheet with your custom background image.  To do this, first click on the “Create PDF” button.  Then select your image and enter a title for your worksheet.  The app then generates a PDF that you can print and use for offline measurements.

How to compare two angles

Want to compare two angles?  Whether you need to find the degree of the angle or just want to see how two angles are facing each other, this app is for you.  Best of all, it’s free and works on any device.  In addition, you can create a PDF worksheet with your custom background image.  Let’s start!

Conclusion

This app is a great tool for anyone who needs to measure angles or compare two angles.  It’s free, easy to use and works on any device.  You can also create a PDF worksheet with your custom background image, which makes it even more convenient.  Whether you are a student trying to complete a homework assignment or a professional working on a project, this app is sure to come in handy.

How to Read a Ruler in Inches/cm/mm?

  • Choose your preferred method of measurement (inches, cm, or mm)
  • Place the ruler on the object you wish to measure.
  • Align the zero mark on the ruler with one end of the object.
  • Read the measurement at the other end of the object.
  • Convert units as necessary.

To help people get accurate measurements, whether they are working on a project at home or in the office.

Ruler.digital is a free ruler app for any online platform. Ruler.digital offers an easy-to-use, accurate on screen measurement tool that lets you measure anything in inches or centimeters/millimeters to the pixel for any device (desktop, laptop, tablet, mobile).
Elizabeth Smith
COO

I love our online ruler, very convenient.

We aspire to be the go-to online ruler for anyone in need of quick and accurate measurements. Our device-responsive design ensures that anyone can access our service regardless of their preferred platform. We hope to provide a convenient and trustworthy solution for anyone who needs it.
Jean Bowen
Designer

We help people stay productive and efficient by providing them with a handy and accurate on-screen online ruler.

We ruler.digital provide an online ruler that is handy and accurate, in order to help people measure things on their screen with ease. Our mission is to make sure that our customers can have a seamless experience when it comes to measuring things on their devices.
Rachel Whatley
AM

Frequently Asked Questions

People also ask

Yup, we love to make things easier for you. Whether you are a professional or an amateur at measuring, with Ruler.digital you’ll always have an online ruler ready to use when you need it.

Our online ruler is always available to you. You don’t need to download anything and it’s perfect for all devices, especially mobile devices. With our digital ruler, you can measure in both inches and cm/mm. Easy as pie!

You can use Ruler.Digital with any device that has a browser, even mobile devices such as phones or tablets. Simply visit Ruler.Digital on your device’s browser and you will find the ruler to start using it.

Ruler.digital is available on your phone, tablet and desktop computer so it will work no matter what device you are using. Just type “ruler.digital” in your browser and the tool will pop up.

We provide two types of units: inches and cm/mm. The measurement on the ruler can be anywhere from 1 inch (1 inch = 2.54 cm) to 12 inches (12 inches = 30.48 cm).

Put your device close to the item you want to measure, swipe from left to right on the ruler and read the number on the item.

1 inch equals 2.5 cm, and 1 cm equals 0.39 inches.

The mm in ruler is a metric way to measure length. Just like inches, one millimeter is 1/1000 of a meter. The metric system is based on units of 10 (millimeters, centimeters, meters) so getting into the habit should be easy.

Our ruler is an accurate digital on-screen ruler used to measure distances in inches and cm/mm.

A cm is equivalent to 10 millimeters.

It is exactly the same as a ruler in inches, but in cm and mm. Our ruler can be used with any device, no matter if it is a computer, tablet or phone.

Yes! We understand that sometimes you need something more tactile and permanent. So our ruler can be exported as a PDF or PNG, then the user prints out the ruler on paper or plastic.

We have an online protractor that is accurate and precise. There are also many other tools for drawing, measuring and more!

Ruler.digital offers you a wide range of web-based and mobile protractors. You can take measurements on any device and use the ruler to calculate dimensions, angles, slopes and more — straight from your browser without the need for additional apps or plugins!

Ruler.digital is designed to be used as a virtual protractor, which means that it can be attached anywhere on any screen. You just need to enter in your desired angle, drag the tool to the desired location and release to measure.

You can export the angle you measure as a PDF and print it as a protractor for your drafting, engineering, or design needs.