Ok to make the math easier this is metric
Using Southwire RX

width...........area
14-2 9mm ...63.6 mm2
12-2 10mm..78.5 mm2
14-3 7mm....38.5 mm2
12-3 8mm....50.24 mm2
10-3 9mm....63.6 mm2

From Table 4
Trade size..one wire 53%...2 wires 31%....3 or more 40%
1/2"EMT....104 mm2 ...........61mm2............78mm2
3/4"EMT....102 mm2 ...........106mm2...........137mm2
1" EMT......295 mm2 ...........172mm2...........222 mm2