Handy & Accurate Online Ruler

• Online Ruler Cm
• Downloadable Ruler For Computer Screen
• Online Ruler Games
• Online Ruler Game

The Ruler Game Learn To Read A Ruler. Instructions: Use this game to improve how you read a ruler. After you click on the button that says, 'Start New Game,' the name of a measurement will appear in the text box labeled, 'Click on.' Take the Gnomie for a stroll through a beautiful garden, and help him to measure the treasures you encounter along the way. This educational activity allows you to use a ruler to measure the length of various objects, using either inches or centimeters. Trouble Playing This Game? Advertisement Go Ad-Free!

This is a convenient online ruler that could be calibrated to actual size, measurements in cm, mm and inch,the upper half is the millimeter ruler and centimeter ruler, the lower half is an inch ruler. In order to accurately measure the length of your item, we strongly recommend that you calibrate this online ruler first,set the correct pixels per inch to your own device,after adjustment, you will have the most precise ruler online.

How to adjusting this virtual ruler to actual size

1. My laptop has a wide screen (13.6'x7.6'), and resolution is 1366x768 pixels, 1366 / 13.6 = 100.44 PPI. The screen resolution of your current device is pixels.
2. Search 'display by pixel density' online, check if there has your device's brand and model, i am lucky and found my screen has 100 PPI.
3. Use standard objects to compare lengths, check your wallet, use any paper money to be our compare object, then search 'the width of your paper money' online, when you know the width, you can adjust the ruler's PPI setting by it,you can compare to any standard size object at your side, e.g., coin, credit card, CD, paper money, mobile phone, in the office, a A4 size printable paper is a good comparison object,the longer the more accurate.Below ruler adjuster help us to calibrate accuracy more easily.
4. The most accurate way, after i measure the size of virtual ruler by an actual ruler,i found the markings are not very accurate at 30cm,so i adjust the default pixels per inch(PPI) to 100.7, now i have the most accurate virtual ruler on the web.
5. Each device has it's own PPI, eg. my Asus laptop is 100.7 PPI,Apple MacBook Air is 127.7 PPI, Xiaomi Mi Pad 3 is 163 PPI, my mobile phones (Sony Xperia C5, OPPO R11 Plus) are both 122.6 PPI, Apple iPhone 5 is 163 PPI, iPhone 7 is 162 PPI, iPhone X is 151.7 PPI.

Compare Ruler with Credit Card

Dragging ruler adjuster left or right to fit the size of your reference object, remember to save the setting for the next time you use it, after save the setting, refresh your brower to check the result.On the most popular browsers you can press the F5 key or click on the refresh button.

Translate into your native language

We hope to provide a more user-friendly experience,are you willing to offer a native language version for your country ? We are looking for volunteer to improve the content in your native language, if you are interested to help this, please visit this translation page.Below are some other language version.

The story of our ruler

One day, i took my laptop computer to work in the coffee shop, just had a project on hand, and i had to tell the customer the actual size of a product.Just like usual, i didn't carry a ruler with me, so i connected to the internet and tried to find an online virtual ruler to measure my product.

Unfortunately, after i tried the virtual online rulers on the Internet, i found a problem that these existing online rules are not very accurate. If i just want to know what the approximate length is, that's fine, but what i need is a more precise length so that i can apply it to my daily work.

So later, we developed an online ruler by ourselves.It not only improves the accuracy of the measurement, but also has a scale of inches and centimeters so that it can be used in our work.

If you are like us, you need a precise online ruler to measure the product size, i believe this online virtual ruler can also meet your needs.

Command function

I am very happy that many people like our online ruler,also i am very excited to review all the comments from all the visitors. Regarding the joke about comments or commands here, i decided to add a new 'command' function(on the page top) for our dear friends,
I try to make the AI interaction smarter, hope you like our new command function 😛,welcome to try it and share it, let me know your idea.

What do you think about this online ruler ?

Use this screen ruler on your smartphone

Online rulers

• Actual size online ruler : the most accurate size ruler on the web.
• Vertical virtual ruler : measure items in a vertical direction.
• Metric scale ruler : variable scale ruler with metric units(cm, m, km)
• Imperial scale ruler : variable scale ruler with imperial units(in, ft, yd, mi)
• Online protractor : use this transparent protractor to measure the angle of anything

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Length Unit Converters

• Convert MM/CM to Inches : convert mm to inches, cm to inches, inches to cm/mm, include convert decimal inch to fractional inch (e.g. 1.45' = 1 7/16').
  Where is 1.8' in on a 12' ruler ? Where is the 3.2 cm in the 12 inches ruler ? Try this cm inch converter.
• Converter Meters to Feet :convert meters, feet and inches (m, ft and in), convert each other.
• Convert Yards to Meters : yards & meter converter, convert yards to meters, or meters to yards.
• Convert CM to MM : convert millimetre/millimeter(mm) to centimetre/centimeter(cm), or reverse convert.

How to use a ruler

This ruler measure in two different units of length, inches on one side (English ruler) and centimeters on the other side (metric ruler). A metric ruler is use to measure centimeter(cm) and millimeter(mm), the centimeter is a unit of length in the International System of Units; An English ruler provides incremental measurements in inches, with each inch further divided into smaller fractions.

Read an English ruler using fractions of an inch. The distance between any two large numbered lines is 1 inch. The large unnumbered line that is halfway between them is 1/2 inch. The smaller (but still prominent) line between the 1/2 mark and the numbered inch line is 1/4 inch. The tiny little lines between all of the more prominent lines are 1/16 inch.

Observe the much simpler metric rulers. The distance between any two large numbered lines is 1 cm, a metric ruler features two types of lines. The largest mark centimeters, or cm. The smallest lines mark millimeters, or mm.The prominent line between any two numbered lines is 1/2 cm. The small lines between the 1/2 mark and the numbered centimeter mark are 1/10 cm, otherwise known as a millimeter, keep in mind that there are 10 mm to 1 cm. The measurements are decimalized and there are no fractions.

Record distances by the name of the line that it most closely matches. If the length of an object goes to one mark past the halfway mark on your ruler then it will be 9/16 inch on an English ruler or 6/10 cm (or 6 mm) on a metric ruler.

If you want to measure the actual size of a small object in inches or centimeters and you don’t have a real ruler at hand, this virtual on-screen online ruler will help you. You can make the necessary measurements on any device that allows you to browse the web. This online app works on both computers with a large screen (laptops, PCs, monoblocks or smart TVs) and mobile gadgets (phones, phablets, tablets, e-ink readers). The maximum length of the ruler (fully visible when displayed on a sufficient screen) is 20 inches, or 50 centimeters (500 millimeters) for the metric scale option.

💁 How to use this online ruler

For the ruler to display correctly (i.e., in proportion to the actual physical size), it must be calibrated. You can calibrate it in one of the following two ways:

1. 📱 💻 📺 Set screen diagonal

   This is the most reliable and easy way. Specify the size of the diagonal of your screen in inches ('). Enter this value in the input field located in the lower left corner of the ruler image. Then click the or press the button on the keyboard. You can also select the size from the drop-down list (which opens when you click the button , which is adjacent to the numeric input field). This presents many of the most common options among users.

   The diagonal of the current device's display, automatically detected by the browser, is . In most practical cases, this calculated value does not correspond to the real extent and is instead proposed for consideration as an approximate one for consideration purposes. This circumstance is caused by the existing constraint imposed by the specifics of the interaction of modern web browsers (none of which has the functionality of providing web applications with access to information about the display’s physical parameters) with operating systems. Depending on the type and class of device, the probable error varies in a range of up to several centimeters, or 1 inch. Accordingly, to the best possible, the reliability of the indications of the uncalibrated online ruler will differ from the standard. Nevertheless, the deviation may be minimal. In this case, the initially visualized ruler will be suitable for measurements that do not require high accuracy (especially when measuring small objects).

   If you do not know the exact value of your screen’s diagonal, you can find it in the technical documentation attached to the device, or simply search the Internet for the model name.
   If for some reason this information is difficult to obtain and you have a standard plastic card with you, you can use the second method. ↓

2. 💳 Fit to the width of a plastic card

   You can also calibrate the on-screen ruler using a bank payment card. Its standard width is 3.37 inches (3 3⁄8 inches), or 85.6 mm (8 centimeters, 56 millimeters) for the metric measurement. For your convenience, the corresponding sign is plotted under the scale of the ruler. Change the diagonal value in the input field until the edge of the plastic card attached (oriented horizontally) to the screen coincides with the black stroke to the left of the icon.

   Using this method in addition to the first method will allow you to determine the size of the display diagonal. To avoid the known inconvenience associated with selecting a number by successive manual input, bring it to the desired value using the vertical scroll arrows that appear on the right side of the input field when you hover the cursor over it (when using the virtual ruler on a PC).

📏🔧 How the ruler’s actual size is achieved

Online Ruler Cm

1. calculates the diagonal in pixels (it does not matter if the number of virtual pixels on which the browser operates is the actual physical resolution of the display);
2. calculates the PPI (pixels per inch) of the screen: the resulting diagonally expressed diagonal is divided by the user's diagonal value in inches;
3. determines the length of the ruler in pixels, the corresponding real 50 centimeters: the PPI value is multiplied by expressed in inches 50 centimeters. For inch scale, it is simply multiplied by 20.

Downloadable Ruler For Computer Screen

⚠️ ️Note

Online Ruler Games

Keep in mind that the above instructions for setting up the ruler are valid only when the following conditions apply:

Online Ruler Game

• Standard page scale adjustment in your browser (this is true for desktop browsers). When the scale is zoomed in/out, the ruler scale will shrink/stretch (along with other elements on the page that are subject to transformation during scaling). This will lead to a significant distortion of the online ruler readings. If you often, for example, change the font sizes on sites, be sure to set the scale to 100%;
• JavaScript is enabled;
• The ability to download images is enabled.