Unfortunately, after i tried the virtual online rulers on the Internet, So i connected to the internet and tried to find an online virtual ruler to measure my product. Just like usual, i didn't carry a ruler with me, Just had a project on hand, and i had to tell the customer the actual size of a product. One day, i took my laptop computer to work in the coffee shop, Please visit this translation page(click). If you are willing to offer a better description in your native language, Make it more natural and easier for everyone to use, On the most popular browsers you can press the F5 key or click on the refresh button.Īnd we want to provide a better native language environment, Remember to save the setting for the next time you use it,Īfter save the setting, refresh your brower to check the result. No installation required, free to use, and works on your phone screen as well.ĭragging ruler adjuster left or right to fit the size of your reference object,

How to use your computer screen as a ruler?Īll you need is a web browser and a credit card to compare physical sizes, Save the pixels per inch (PPI) according your own device, then you can use this ruler next time. Select a comparison item to start calibrating the ruler, My mobile phones (Sony Xperia C5, OPPO R11 Plus) are both 122.6 PPI,Īpple iPhone 5 is 163 PPI, iPhone 7 is 162 PPI, iPhone X is 151.7 PPI. Now i have the most accurate virtual ruler on the web. So i adjust the default pixels per inch(PPI) to 100.7,

I found the markings are not very accurate at 30cm, In the office, a A4 size printable paper is a good comparison object,īelow ruler adjuster help us to calibrate accuracy more easily.Īfter i measure the size of virtual ruler by an actual ruler, You can compare to any standard size object at your side,Į.g., coin, credit card, CD, paper money, mobile phone, When you know the width, you can adjust the ruler's PPI setting by it, Then search 'the width of your paper money' online,

Use standard objects to compare lengths, check your wallet, use any paper money to be our compare object,.

I am lucky and found my screen has 100 PPI.

Search 'display by pixel density' online, check if there has your device's brand and model,.

The screen resolution of your current device is pixels. So the aperture f-stop to get the same depth of field would need to be f/2.6.To have the most accurate ruler online, just set the pixels per inch(PPI),īelow are some ways to know the pixels per inch to your device.

To calculate the f-stop needed it does 4 / 1.53 = 2.61 = f/2.6.

The calculator will then do the calculation 50 / 1.53 = 32.68 = 33 mm, meaning you would need a lens with a focal length of 33 mm, so the image is equivalent to one formed with a 50 mm full-frame lens.

Go to the second section, '35mm full-frame equivalents', and input a focal length of 50 mm and an f-stop of 4.

Now the calculator is an APS-C focal length calculator.

Select the Sony APS-C crop factor with a value of 1.53x from the list of sensor sizes.

You have an APS-C camera with a crop factor of 1.53x (a super 35 crop factor), and you want to buy a lens that will give the same image as a 50mm f/4 full-frame lens. Let's look at a common problem when choosing lenses for crop sensor cameras. The calculator will apply the crop factor and tell you the focal length and f-stop in terms of 35mm full-frame equivalents.Īs with most Omni calculators, it also works backward. You can then input the focal length of your camera's lens and the aperture f-stop you are interested in using. An example image will appear when you do this, showing how much smaller or larger your sensor is compared to the standard full-frame sensor. The first thing to do is to select your camera's sensor size from the list of sensor sizes.

Life size ruler measurements