4 centimeters Ruler — Actual Size
Use this ruler to visualize and measure exactly 4 centimeters on your screen. After calibrating with a credit card or reference object, the ruler above displays 4 cm at its true physical size on any device — phone, tablet, or desktop.
Unit Conversions for 4 centimeters
4.00
centimeters
40.0
millimeters
1.57
inches
How to Measure 4 centimeters
- Open this page on the device you want to measure with and use the ruler displayed above.
- Calibrate by placing a credit card on the screen and adjusting the slider until the outline matches the card. This takes about 10 seconds.
- Place the object you want to measure against the ruler. The markings show centimeters, millimeters, and inches, so you can read 4 cm directly.
- Your calibration is saved in the browser, so the ruler remains accurate on your next visit.
About This Measurement
4 centimeters equals 40.0 millimeters or 1.57 inches. One centimeter is one-hundredth of a meter, or about 0.394 inches. The centimeter is part of the metric system used by most countries worldwide.