What is a 1/4 inch on a ruler?

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.

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To have the most accurate ruler online, just set the pixels per inch(PPI), below are some ways to know the pixels per inch to your device.

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.

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.

Red vertical line

Clicking on the ruler will mark a red vertical line for easy comparison of metric and imperial lengths.

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.

command examples : show 12 mm, show 2.3 cm, show me 5 2/3 in, show me 6 inches, show me how long 1 inch is, show 1 ft ...etc.

Tell me what are you measuring? Does this online ruler help you?

Turn your smartphone and tablet to a ruler and measure the scale of any small thing. Scan above QR code to open browser, and turn your mobile phone screen to landscape mode, so that the length of online ruler will longer.

If the dynamic ruler doesn't redraw after you rotate the smartphone, please ↻refresh your browser

Welcome to share this online ruler to your freineds, if you do like it.

Could not find a real ruler on your desktop ? try this virtual screen ruler.

• 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.

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.

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Terminology
A ruler used to be called a rule, and rulers would be rules. Today, the more commonly found term is ruler. The dictionary defines both the term rule and ruler, so either can be used, and for this document I will only use the term ruler.

 Metric Rulers

 Take a look at the following Metric Ruler.

The longer lines labled with numbers are centimeters, and the shorter lines are millimeters. Since millimeters are 1/10th of a centimeter, if you measure 7 marks after a centimeter, it is 1.7 centimeters long.

 English Rulers

 Take a look at the following English Rulers.

A ruler marked in 8ths. Every mark is 1/8th of an inch.

A ruler marked in 16ths. Every mark is 1/16th of an inch.

The center mark between numbers is 1/2.    The red lines on these rulers are marked at 1/2, and 1.

The next smallest marks on a ruler are 1/4ths. The red marks on these rulers are at 1/4, 1/2, 3/4, and 1. (1/2 is the same as 2/4)

The next smallest marks on a ruler are 1/8ths. The red marks on these rulers are at 1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 7/8, and 1.

The next smallest mark, if there are any, are 1/16ths. The red marks on this ruler are at 1/16, 1/8, 3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, and 1.

When marking down a distance from a ruler, mark the whole inch, followed by a space, then the fraction of an inch. For example, 1 1/2, or 2 3/8. When entering fractions into the conversion calculators, you have to seperate the whole number and the fraction with a + sign. For example, 1+1/2, or 2+3/8.

 This information can be found @ OnlineConversion.com