Reasonably simple actually for 1914 gold standard ates and the amounts in the peace treaties were all using these.
French, Swiss and Belgian franc, Italian lire, Greek drachma, Bulgarian leva, Romanian lei, Serb dinar and some Latin Americans were all the same, thanks Latin Monetary Union! Gold content 0.29gr
Post that.
1 krone = 1.05 francs (0.305hr gold)
1 mark = 1.23 francs (0.358gr gold)
1 ruble = 2.67 francs (0.774gr gold)
1 dollar = 5 francs (slightly more in reality 1.505 gr gold so 5.19 )
1 Ottoman pound = 22.8 francs (6.61gr gold)
1 British pound = 25.22 francs or 4.86 dollars (7.3gr gold)
So to bring out Mitchell's European historical statistics Italian GDP in 1913 was 21.4 billion lire. Germany 52.44 billion marks. By comparison Britain was 2,354 billion pounds and France 49,573 million francs. Or to turn everything to francs
Italy: 21,400
France: 49,573
Britain: 59,369
Germany: 64,501
If memory serves the Ottoman empire in 1914 was 235 million or 5,358 million francs, with the territory lost in the Balkan wars it should be ~280-300 million or 8.84 billion francs. Greece in 1914 1,236 million francs (and would go up to 4,267 million by 1918, stabilize at 3,950 in 1919-20 then drop like a rock in 1921-23 to 1,412 before bouncing up again after 1924.)