The GIMP graphics editing program places a ruler above and to the left of the images you are working on. You can use these rulers to measure parts of your image, draw straight lines, layout image ...

You can change the ruler unit from inches to centimeters, millimeters, points, and Picas. Points are used when you need to simulate pixels, while Picas are typically used to represent fixed horizontal ...

Designers, engineers, builders and students looking for a versatile ruler which offers both millimeters and inches together with a unique aluminum design may be interested in the Re-ruler created by ...

When you need a quick measurement and have no ruler around, the common objects you have in your wallet can give you an approximation. Here are the dimensions for US paper money, coins, credit cards, ...