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Show HN: Online Ruler – Measuring in inches/centimeters

Free online ruler for accurate measuring in inches, centimeters, and millimeters. Use our real size digital ruler on any phone, tablet, or computer.

Place a standard credit or debit card directly on the blue rectangle below. Adjust the slider until the rectangle exactly matches your card's size. This method provides the highest accuracy since credit cards have standardized global dimensions.

Get the Android app