FR to AU clothing size

The short answer

By the formula, FR 34 is AU 6. On brand charts the most common answer is 4 (1 of 2 brands), and 2 different answers are in print.

The formula and the brands' most common answer differ on 8 of 11 sizes below. Use the brand's own number for the brand you are buying.

FR to AU. The formula column is arithmetic; the brand columns are read from 2 brand charts checked by hand.
FR	AU by formula	Most brands print	Other answers in print
32	4	not published	not published
34	6	4 (1 of 2)	6: J.Crew
36	8	6 (1 of 2)	8: J.Crew
38	10	8 (1 of 2)	10: J.Crew
40	12	10 (1 of 2)	12: J.Crew
42	14	12 (1 of 2)	14: J.Crew
44	16	14 (1 of 2)	16: J.Crew
46	18	16 (1 of 2)	18: J.Crew
48	20	18 (1 of 2)	20: J.Crew
50	22	not published	not published
52	24	not published	not published

Tinted rows: the formula differs from the brands' most common answer. A brand is counted once per answer.

The widest split is at FR 34: brand charts print anything from AU 4 to 6 for the same size.