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 ·
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.
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.
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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12 June 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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16 February 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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7 June 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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17 January 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)
Piliapp
piliapp.com › actual-size › label › ruler
label: online ruler | Check actual size
label: online ruler | All Items · View · View · Home | Symbol | Font generator | Clock & Timer clock | roulette & Draw lots | Utilities · Report an issue | Blog | Privacy | Terms | 🌐 | © 2026 ·
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.
Zyougi
zyougi.com › en › android
Actual Size Online Ruler for Android | Precise Screen Ruler (cm/inch)
Need an online ruler? Use this precise actual size ruler for Android. Measure in centimeters (cm) and inches (inch) directly on your screen without an app. Perfect for quick, accurate measurements on the go.
Google Play
play.google.com › store › apps › details
Ruler - Apps on Google Play
14 October 2025 - 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....
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?
12 June 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.
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.
Ruleronline
ruleronline.uk
Online Ruler
Ruler Online is a smart, high-precision digital ruler that instantly turns your screen into a real-world measuring tool. With automatic screen size detection and intelligent calibration, it delivers accurate results with zero effort.
RapidTables
rapidtables.com › tools › ruler-cm.html
Ruler cm/mm online, actual size 📏
Ruler cm/mm - length meter online
Aspose
products.aspose.app › aspose products › drawing apps › ruler
Use actual size online ruler
17 hours ago - If the measurement is incorrect - specify your screen size in inches manually. Click the “save changes” button. 2The Online Ruler creates a virtual instrument in two different units of measurement.
Zyougi
zyougi.com › en › iphone12pro
Online Ruler — Real Size Measurement for iPhone12 & 12 Pro (cm & inch)
Free online ruler for iPhone12 and iPhone12 Pro. — measure real size in cm or inch directly in your browser with no app installation required.
RapidTables
rapidtables.com › web › tools › pixel-ruler.html
Online Ruler | On screen pixel image ruler
Online on screen pixel image ruler.
NAPPA DORI
nappadori.co.uk › translation missing: en.general.breadcrumb.home › leather ruler
Buy Leather Ruler Online in UK | Premium Craftsmanship Measuring Tool – NAPPA DORI
Product Description Crafted in Genuine Leather, this quintessential leather ruler features embossed measures in Centimetre or Inches. Dimension 6" ruler Care Instructions Leather is a natural material and ages beautifully, however, please avoid using your product in extreme conditions like ...
Zyougi
zyougi.com › en › iphone13pro
Online Ruler — Real Size Measurement for iPhone13 & 13 Pro (cm & inch)
Free online ruler for iPhone13 and iPhone13 Pro. — measure real size in cm or inch directly in your browser with no app installation required.
Google Play
play.google.com › store › apps › details
Ruler Cm - Apps on Google Play
Ruler Cm includes the following functions: length measurement, thread pitch determination, length calculation, straight line, unit converter (inches to millimeters, inches to centimeters), online ruler, vernier caliper, etc. mm ruler ( Roulette) is a beautiful, functional and easy to use tool ...
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.