# Circles on the Outside of a Circle

## The numbers of circles on the outside of an inner circle or the geometry of rollers on a shaft

The calculator below can be used to calculate the maximum numbers of rollers on a shaft - or - the maximum number of circles on the outside of an inner circle.

The calculator is generic and any kind of units can be used - as long as the same units are used for all values.

*Shaft or Inner Circle Diameter (in, mm, m)*

*Rollers or Outside Circles Diameters (in, mm, m)*