Disclaimer
Last updated: 2026-09
Accuracy
Online Ruler is provided free of charge and “as is”, without warranty of any kind. The accuracy of on-screen measurements depends on your display’s pixel density, operating-system display scaling, browser zoom level, and the quality of calibration. Before relying on any measurement for critical work, verify it against a physical ruler or a calibrated instrument.
Intended use
This tool is intended for quick, everyday measurements of small objects. It is not a precision measuring instrument and must not be used for engineering tolerances, medical purposes, legal measurements, or any application where error could cause harm or loss.
External links and advertising
This website may contain links to third-party sites and display advertising. We are not responsible for the content, accuracy, or privacy practices of third-party websites, and the presence of an ad or link does not imply endorsement.
Liability
To the maximum extent permitted by law, we shall not be liable for any loss or damage arising from the use of, or inability to use, this website or its tools.