There’s a measure app on your phone for free, it’s also a bubble level… saved my ass a few times when needed to straighten things on the go while working. Answer from MacMillz718 on reddit.com
Piliapp
piliapp.com › actual-size › cm-ruler
Actual size of Online Ruler (cm/mm)
Online Ruler (cm/mm) 30CM / 300mm · width:300.0mm (11.81Inch) {as_size} / {as_monitor} full screen drag it iframe embed · Inch Ruler · online ruler · Yes, I am using {monitor} . Save this settings. I am using {monitors} I am using -inch screen save settings ·
Online Ruler
ruler.onl
Online Ruler in Actual Size (inches, cm/mm) — measure something!
A handy and accurate on-screen online ruler in inches and centimeters/millimeters. For any device.
iRuler.net
iruler.net
iRuler.net - Online ruler
Centimeters and millimeters are part of Metric System. To measure in inches use bottom scale. Numbers on scale corresponds to inches. Inches relates to Imperial System. Easy. Just open iruler.net on your phone. Use string. After that fold string to made it measurable with online ruler.
Any good apps to use a ruler online accurately?
There’s a measure app on your phone for free, it’s also a bubble level… saved my ass a few times when needed to straighten things on the go while working. More on reddit.com
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June 12, 2025iRuler is a measuring ruler that is scaled to the resolution of your monitor
Just click the link at the top left that says Online Ruler . I couldn't post the homepage because it's been posted before when this subreddit was a lot smaller. More on reddit.com
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February 16, 2014What ruler app can you suggest offline/online that would extend more than 12 inches in mobile?
No one likes a show off. More on reddit.com
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June 8, 2024Electronic Ruler - for slower measuring
Conceptually and aesthetically I love this, but in terms of function - it's a Juicero. Tenth of a mm accuracy is great, but lets be honest, that's narrower than a human hair, and even with a magnifying glass, you don't want to be scaling off of drawings to that level. If you do need that level, digital tools will get you far better resolution and can be used to skew and correct for scaling issues. Three buttons and the slider to scroll through 90 built in scales plus divider mode and scale input mode? I'll turn my scaled rule over and have the right scale in less than a second thanks, or maybe have to go grab the metric one from the mug at my desk. Even dividing -- just skew your ruler at any scale that gets you the right number of divisions and strike down from those marks - it's super fast for sketching, and if you're hand drafting you want an equal spacing divider to do it faster and more accurately than some LEDs. More on reddit.com
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January 18, 2023Why is the ruler size wrong when I open it?
Browsers usually default to 96 PPI, which varies from your actual screen density. To fix this, click the 'Calibrate Ruler' button and use a standard credit card to set the correct scale.
codeshack.io
codeshack.io › online-ruler
Online Ruler - Actual Size on Screen (CM, MM, Inch)
What is the standard size of a credit card?
A standard credit card (ISO/IEC 7810 ID-1) is exactly 85.60 mm or 3.37 inches wide. This consistent size makes it the perfect tool for calibrating digital rulers.
codeshack.io
codeshack.io › online-ruler
Online Ruler - Actual Size on Screen (CM, MM, Inch)
Is it safe to place objects on my screen?
Yes, most modern screens are durable. However, avoid pressing hard or using objects with sharp edges that could scratch the measuring surface.
codeshack.io
codeshack.io › online-ruler
Online Ruler - Actual Size on Screen (CM, MM, Inch)
CodeShack
codeshack.io › online-ruler
Online Ruler - Actual Size on Screen (CM, MM, Inch)
A free, accurate online ruler to measure physical objects. Features 1:1 calibration, 30cm+ support, vertical mode, and full-screen measuring.
Reddit
reddit.com › r/iphoneapps › any good apps to use a ruler online accurately?
r/IPhoneApps on Reddit: Any good apps to use a ruler online accurately?
June 12, 2025 -
I recently needed to measure something small while working on a project and didn’t have a physical ruler around. I came across an app that lets you use a ruler online by adjusting it to your screen size, which actually worked better than I expected.
Has anyone here found a go-to app or site for this? I'm curious if there’s one that works well across different devices without needing to install anything. Would love to hear what you use, especially if it’s accurate enough for small DIY stuff or quick fixes.
Google Play
play.google.com › store › apps › details
Ruler - Apps on Google Play
Features: 📏 Digital ruler and ... projects, school, office, and everyday tasks This all-in-one measurement app helps you measure length, distance, and angles whenever you need....
App Store
apps.apple.com › us › app › ruler › id623207505
Ruler® App - App Store
Download Ruler® by Tue Nguyen Minh on the App Store. See screenshots, ratings and reviews, user tips, and more games like Ruler®.
Anruler
anruler.com
Online Ruler (cm/mm, inches) – Measure in Actual Size
Free online ruler for accurate measuring in inches, centimeters, and millimeters. Use our real size digital ruler on any phone, tablet, or computer.
Ginifab
ginifab.com › feeds › cm_to_inch › actual_size_ruler.html
Actual Size Online Ruler (mm,cm,inches) - Screen Measurements
Use our online actual size ruler to accurately measure objects in both centimeters and inches. Print-ready and calibrated for your screen.
Zyougi
zyougi.com › en › ipad
Real Size Online Ruler for iPad
On this site, you can check the length of 1cm, 2cm, 3cm, 4cm, 5cm, 6cm, 7cm, 8cm, 9cm, 10cm, and so on with the actual size of the ruler. You can also check how long 1inch, 2inch, 3inch, 4inch, 5inch, 6inch, 7inch, etc. are with the actual size of the ruler image.
Toy Theater
toytheater.com › educational games › teacher tools › virtual manipulatives › science manipulatives › ruler centimeter
Ruler Centimeter » Toy Theater
May 19, 2023 - Can you draw a ladybug that’s two centimeters long? Practice measurements with this fun and engaging virtual centimeter ruler. Use the online centimeter ruler to measure lines, drawings, and more!
SourceForge
sourceforge.net › projects › screenruler
Screen Ruler download | SourceForge.net
Download Screen Ruler for free. Ruler tool for measuring in pixels, centimeters, inches and points. Screen Ruler is a lightweight and configurable ruler tool for Windows Desktop. It allows you to measure the size of elements on the screen in ...
Zyougi
zyougi.com › en › iphonex
Real Size Online Ruler for iPhoneX and XS
This is a real-size, actual-size web ruler viewed on an iphoneX and XS browser. You can use it from the browser of your smartphone when you do not have a ruler at hand.
Angle meter
angle-meter.github.io
Online angle meter
Online and mobile angle measurement tool. Measure angles online in degrees from 0° to 360°.
RapidTables
rapidtables.com › tools › ruler-cm.html
Ruler cm/mm online, actual size 📏
Ruler cm/mm - length meter online
Gynzy
gynzy.com › en-us › library › items › ruler
Ruler | Gynzy
Demonstrate measuring quickly and easily on the interactive whiteboard.
Theskyonlinestore
theskyonlinestore.com › products › digital-ruler
Digital Ruler: Measure Anything Instantly
Transform your space with smart home gadgets! Discover clever tech, home hacks, and futuristic devices that make life easier. Shop our curated collection now and upgrade your space. Find the latest trending home gadgets that solve everyday problems and bring a touch of fun and decoration to ...
Center of My Screen
centerofmyscreen.com
Center of My Screen + Online Ruler App
Find the center of your screen in the middle and along the edges. Display an actual, 1:1 size ruler. Great for aligning webcams and other equipment, or calibrating an aim dot for pro gaming.
Herman Miller
store.hermanmiller.com
Herman Miller Store | Shop Iconic Home & Office Furniture
Discover new ways to live, work, and play. Our online store is stocked with best-selling classics and contemporary favorites designed for every mood and mode.
Ruler
ruler.now
Ruler.Now – Online Ruler
An online screen ruler tool for accurate on-screen measurements. Measure in actual size using centimeters, millimeters, inches, or pixels.