On-screen ruler – actual size, no app
Open the page for your phone or tablet and the right edge of the screen becomes a millimetre ruler at true scale. Each page is drawn for that model's pixel density, so it is accurate the moment it opens.
Pick your device below. If it is not listed, the Japanese version can detect the model automatically or calibrate with a credit card (the long side is 85.6 mm).
The strip has millimetres on the right and inches (1/16 steps) on the left. Every device page also shows the screen size in inches and lists what fits on it in one go – a credit card, a dollar bill, Letter paper – and what you have to measure in two passes. Settings like display zoom can change the scale by a few percent; the pages say how to check.
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iPhone
- iPhone 16e2025
- iPhone 172025
- iPhone 17 Pro2025
- iPhone 17 Pro Max2025
- iPhone Air2025
- iPhone 162024
- iPhone 16 Plus2024
- iPhone 16 Pro2024
- iPhone 16 Pro Max2024
- iPhone 152023
- iPhone 15 Pro2023
- iPhone 15 Plus2023
- iPhone 15 Pro Max2023
- iPhone SE(第3世代)2022
- iPhone 142022
- iPhone 14 Plus2022
- iPhone 14 Pro2022
- iPhone 14 Pro Max2022
- iPhone 13 mini2021
- iPhone 132021
- iPhone 13 Pro2021
- iPhone 13 Pro Max2021
- iPhone SE(第2世代)2020
- iPhone 12 mini2020
- iPhone 122020
- iPhone 12 Pro2020
- iPhone 12 Pro Max2020
- iPhone 11 Pro2019
- iPhone 112019
- iPhone 11 Pro Max2019
- iPhone XS2018
- iPhone XR2018
- iPhone XS Max2018
- iPhone 82017
- iPhone 8 Plus2017
- iPhone X2017
- iPhone SE(第1世代)2016
- iPhone 72016
- iPhone 7 Plus2016
- iPhone 6s2015
- iPhone 6s Plus2015
- iPhone 62014
- iPhone 6 Plus2014
- iPhone 5s2013
- iPhone 5c2013
- iPhone 52012
- iPhone 4S2011
- iPhone 42010
iPad
- iPad(第11世代)2025
- iPad Air 11インチ(M2)2024
- iPad Pro 11インチ(M4)2024
- iPad Pro 13インチ(M4)2024
- iPad Air 13インチ(M2)2024
- iPad mini(第7世代)2024
- iPad(第10世代)2022
- iPad Air(第5世代)2022
- iPad(第9世代)2021
- iPad mini(第6世代)2021
- iPad(第8世代)2020
- iPad Air(第4世代)2020
- iPad mini(第5世代)2019
- iPad(第7世代)2019
- iPad(第6世代)2018
- iPad Pro 11インチ2018
- iPad Pro 12.9インチ2018
- iPad(第5世代)2017
- iPad Pro 9.7インチ2016
- iPad mini 42015
- iPad Air(第2世代)2014
- iPad mini 32014
- iPad mini 22013
Google Pixel
- Pixel 9a2025
- Pixel 8a2024
- Pixel 92024
- Pixel 9 Pro2024
- Pixel 9 Pro XL2024
- Pixel 7a2023
- Pixel 82023
- Pixel 8 Pro2023
- Pixel 6a2022
- Pixel 72022
- Pixel 7 Pro2022
- Pixel 62021
- Pixel 6 Pro2021
- Pixel 4a2020
- Pixel 52020
Samsung Galaxy
- Galaxy S252025
- Galaxy S25 Ultra2025
- Galaxy S242024
- Galaxy S24 Ultra2024
- Galaxy A55 5G2024
- Galaxy S232023
- Galaxy S23 Ultra2023
- Galaxy A54 5G2023
- Galaxy S222022
- Galaxy S22 Ultra2022
- Galaxy A23 5G2022
- Galaxy A33 5G2022
- Galaxy S212021
- Galaxy S21 Ultra2021
- Galaxy A32 5G2021
Sony Xperia
- Xperia 1 VI2024
- Xperia 10 VI2024
- Xperia 1 V2023
- Xperia 5 V2023
- Xperia 10 V2023
- Xperia 1 IV2022
- Xperia 5 IV2022
- Xperia 10 IV2022
Sharp AQUOS
- AQUOS sense92024
- AQUOS wish42024
- AQUOS sense82023
- AQUOS wish32023
- AQUOS sense72022
- AQUOS sense62021
OPPO
- OPPO Reno11 A2024
- OPPO Reno9 A2023
- OPPO Reno7 A2022
How it works
A screen's pixel density (ppi) and its device pixel ratio tell you how many CSS pixels make one millimetre: ppi ÷ 25.4 ÷ ratio. The page draws the ticks from that number and from the live pixel ratio reported by the browser, rebuilding them whenever the window changes. Nothing is uploaded, and nothing is stored except an optional calibration value on your device.
KuraLab is a small Japanese site of tools and explainers. The ruler started as a page for the iPhone 5 in 2012; this is the 2026 rebuild. 日本語版