This calculator is intended to help selection of Stepper Motors for Delta / Kossel 3D printers. The formulas and information on which it is based (and the initial values) are derived from: https://duet3d.com/wiki/Choosing_stepper_motors
Torque Ratio over 100 is 'good'.
It means there is 'headroom' in the system.
Of course, there will never be more torque at speed than holding torque.
Torque Ratio under 100% may be OK, it depends on how much torque is really needed to move your printer vs. how much torque is available from the motors.
Since Voltage and Resistance of the stepper motor are not part of this calculator, it is worth noting that you should avoid motors with rated voltage (or product of rated current and phase resistance) > 4V or inductance > 4mH.
The input fields can be pre-set via URL arguments:
Hint: Data Sheets may have N.cm, In-OZ, Kg.m, etc. Be certain that you convert to Nm.
Hint: Set the rod angle to 45° and the belt speed will equal the input desired speed, useful for calculating cartesian printers.