You can use the following formulas to calculate the value of the corresponding relative unit (em and %)
Starting from points/pt (used in Word):
px = pt * 4/3
em = pt / 12
% = pt * 100/12
Starting from Pixels/px:
pt = px * 3/4
em = px / 16
% = px * 100/16
These formulas are generally used for these kind of calculations.
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