Online Ruler Tool
* Before use, make sure to calibrate the ruler by entering screen size or adjusting the ruler scale to match a standard card width (ex. credit/debit/gift card).
About the Online Ruler
Have you ever needed to measure a small object, such as a ring or a bolt, and couldn't find a ruler? So did we; that’s why we decided to make a tool to fix that problem. Our online ruler is a free way for users to make sure they always have a ruler when they need one. Whether you are on a desktop, mobile phone, or tablet, this tool gives users an instant 1:1 scale ruler.
Likewise, for ease of use, we also added the choice to use inches, centimeters, or millimeters, and a measurement guide. To use the guide, you can click and drag the red circle on the ruler. This circle shows the measurement for the line above it. Using this guide, you can drag the line to the end of your item and easily get an exact measurement without needing to count.
How to Use and Calibrate
The largest issue with using an online ruler is the scale. To fix this issue, we provide two methods to calibrate the ruler. It is important to calibrate the ruler before you use it. You only need to calibrate the ruler once, as the settings are saved to your local browser. Then, every time you return to the tool, your ruler will be automatically calibrated.
The first method to calibrate the ruler is by looking up your device's screen size. Most phones or monitors will include the size of the device screen in inches within their specs. If you know this information, you can use the slider to adjust it to match your device's screen size. Then, the ruler will be accurately calibrated.
The second method is to use a standard-sized card. For example, across the world, credit cards, debit cards, and gift cards are standardized so they can work in any country. This size is a 3.37-inch width and a 2.125-inch height. By using this universal standard, we can calibrate the ruler. All you would need to do is use the slider on the top and adjust the ruler until the card width matches the dotted line width. Once the distance from the dotted line to the start of the ruler is the same width as the standard card, your ruler is calibrated. Because all card makers follow strict size guides, this makes for an accurate ruler as well.