Actual size of Online Ruler (cm/mm) 30CM / 300mm width:300.0mm (11.81Inch). Actual Size Online Ruler (inches, cm/mm) — measure something! 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.
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Frequently asked questions
Ruler Measurements
How does Online Ruler works?
iRuler.net are trying to detect size of your screen and then shows ruler in actual size. We are using machine learning to identifying your device, so each time you specifying correct size you are making our Ruler smarter.
Ruler Actual Size
How could I be sure that ruler is correct?
You could ensure that the ruler on the screen is in actual size by measuring some 'standard' object you have in your pocket like A4 paper, credit card, iPhone, banknote, etc. For example, you have 100 hundred dollar bill. You googling '100 dollar note size', finding that it is 2.61 inches wide and then measuring it with the ruler. If measured size is 2.61 then the ruler is correct.
How to measure length in centimeters?
To measure in centimeters use top scale. Numbers on scale corresponds to centimeters. Smaller not numbered marks corresponds to millimeters. Centimeters and millimeters are part of Metric System.
How to measure length in inches?
Hexographer keygen for mac. To measure in inches use bottom scale. Numbers on scale corresponds to inches. Inches relates to Imperial System.
How to use my phone as a ruler?
Easy. Just open iruler.net on your phone.
How to measure waist circumference online?
Use string. After that fold string to made it measurable with online ruler. After that multiply the size of folded string by 2^N, where N - how many times you fold the string.
Handy & Accurate Online 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.
How to adjusting this virtual ruler to actual size
- 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.
- 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.
- 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.
- 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.
- 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
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
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
Ruler Of Everything
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.
Ruler Actual Size
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.
Ruler Inches
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.
Online Ruler
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.