Here are Joseph Prusa's and Nathan Zadoks helpful calculators mainly used for 3D printer building but a lot of the core features can be applied to a host of different machine builds as well.
Features
Click links below for different versions of the Reprap Calculator
- Steps per millimeter - belt driven systems
- Steps per millimeter - lead screw driven systems
- Optimal layer height for your Z axis
- Accelerations
RepRap Calculator - Prusa Printers
Thanks for sharing this great resource Joseph and Nathan!
OpenBuilds

Joseph Prusa's and Nathan Zadoks - RepRap Calculators
Useful set of calculators for RepRap users.