FREQUENTLY ASKED QUESTIONSOnline Ruler FAQs & Help
Everything you need to know about measuring objects online and viewing rulers in office suites.
Can I use my phone as a ruler?+
Yes, you can easily use your phone as a ruler. By opening our free online ruler in your mobile browser, you can place physical items like screws, keys, or jewelry directly against your phone's screen or bezel edge. For 100% actual size accuracy, calibrate the scale using any standard credit card (85.60 mm).
Is there a ruler online?+
Yes! Online Ruler (onlinerulercm.com) is a free, accurate online ruler tool accessible directly in any web browser without downloading an app. It renders true-to-scale rulers in centimeters, millimeters, and inches along your screen edges.
How to identify 1 inch?+
On our online ruler inches actual size display, 1 inch is the distance between major numbered marks (e.g., 0 to 1). If you don't have a ruler handy, common physical references for approximately 1 inch include the distance from your thumb's knuckle to the tip, a standard US quarter (0.955 inches in diameter), or a standard bottle cap.
How to measure cm online?+
To measure cm online, select the 'cm' toggle in our toolbar. Hold your physical object against the top or bottom screen edge, align one end with the 0 mark, and read the number at the other end. For smaller items requiring finer measurement, switch to our mm online ruler mode.
Can a smart phone measure?+
Yes, modern smartphones can measure physical objects in two primary ways: by using an accurate online ruler on the screen for small items (under 6 inches), or by using built-in camera AR measurement apps (like Apple's Measure app or Google ARCore) for large rooms and furniture.
Can we measure online?+
Absolutely. With our calibrated real online ruler tool, you can measure physical lengths, widths, and thicknesses online. Simply calibrate your display's pixel density (PPI) using a credit card or screen diagonal to ensure the on-screen markings match real-world physical units.
how to read a ruler online+
To read a ruler online: 1) Identify your measurement unit (cm, mm, or inches). 2) In metric mode, the tall numbered marks are centimeters, medium lines are 5mm, and smallest ticks are 1mm. 3) In imperial mode, numbered lines are full inches, divided into 1/2", 1/4", 1/8", and 1/16" tick marks. 4) Place your object at the zero mark and read the exact tick line at the far edge.
how to view ruler in word online+
To view the ruler in Microsoft Word Online: 1) Open your document in Microsoft Word for the Web. 2) Click on the 'View' tab in the top ribbon menu. 3) In the 'Show' section, check the box labeled 'Ruler'. Note that the ruler will appear at the top and left of your document canvas in Editing or Reading view.
how to use online ruler+
Using our online ruler tool is simple: 1) Select your preferred edge (Top, Bottom, Left, or Right). 2) Choose your unit (cm, mm, or inches). 3) Click 'Calibrate' and match the on-screen card guide with a physical credit card. 4) Place your physical object flush against your monitor or phone edge to measure directly.
how to use a ruler online+
To use a ruler online: Open onlinerulercm.com on your phone, tablet, or PC. Click the Calibrate button and align a standard credit card (85.60 mm) or enter your screen diagonal. Once calibrated to actual size, rest your physical object against the edge of your screen and read the measurement in cm, mm, or inches.