Standard cartesian grid papers in various sizes for engineering, mathematics, and design work.
Standard imperial measurements perfect for US-based projects and engineering work.

Also know as Quad paper four boxes make up an inch. Sometimes it's also been referred to quadrille paper. The only difference between this an the other graph paper listed here is the size of the boxes.

Working with inches? Having 10 squares per inch gives you a nice even number to work with that is both manageable and precise.

The half inch graph paper can handily function as a two dimensional ruler.

The larger size graph paper be useful when using the graph paper for measuring. Also when using it with underdeveloped motor skills, for example when working with children. It's also handy when giving presentations where the audience has to be able to see it from far away.
Metric measurements using millimeters and centimeters, ideal for international projects and scientific work.

This is a standard Cartesian system graphing paper. There are horizontal and vertical lines 5mm apart. Graph paper is often used in engineering, it's common to see engineering graph paper printed on light green paper.

This is standard graph paper similiar to the graph paper above except of course the lines are 1 centimeter apart instead.