I looked at a table with AWG to mm² conversions and it occured to me the sizes are very close to each other. If you fit the AWG to a metric size: E.g. #18 to 0.80 mm², #17 to 1.00 mm² and #16 to 1.25 mm² you end up with something that is only five percent or less smaller than the true value.
As I know that these 1.25 mm², 2.00 mm² etc. sizes are used in some countries, I got the idea to devise a new wire gauge. Let's call it MWG, Metric/Metricated(???)/Metrified(???) Wire Gauge.
The scale then goes like this:
30______0.0500 mm²
29______0.0630 mm²
28______0.0800 mm²
27______0.100 mm²
26______0.125 mm²
25______0.160 mm²
24______0.200 mm²
23______0.250 mm²
22______0.315 mm²
21______0.400 mm²
20______0.500 mm²
19______0.630 mm²
18______0.800 mm²
17______1.00 mm²
16______1.25 mm²
15______1.60 mm²
14______2.00 mm²
13______2.50 mm²
12______3.15 mm²
11______4.00 mm²
10______5.00 mm²
9_______6.30 mm²
8_______8.00 mm²
7_______10.0 mm²
6_______12.5 mm²
5_______16.0 mm²
4_______20.0 mm²
3_______25.0 mm²
2_______31.5 mm²
1_______40 mm²
0_______50 mm²
00______63 mm²
000_____80 mm²
0000____100 mm²