Standard ZDoom units

distance – mapunits

velocity – mapunits per tic

acceleration – mapunits per tic^2

time – tics (or seconds in non-gameplay contexts)

angle – turns counterclockwise

Gravity is defined by free fall acceleration, and is measured using the same units as normal acceleration.

Non-standard units

These units should be converted to standard units before performing any operations with them.

seconds (35:1)

octics (4.375:1)

degrees (360:1)

radians (tau:1)

byte angles(256:1)

sv_gravity units (800:1)