DE to FR clothing size

The short answer

By the formula, DE 40 is FR 42. On brand charts the most common answer is 42 (1 of 2 brands), and 2 different answers are in print.

The formula and the brands' most common answer agree on every size below. Use the brand's own number for the brand you are buying.

DE to FR. The formula column is arithmetic; the brand columns are read from 2 brand charts checked by hand.
DE	FR by formula	Most brands print	Other answers in print
30	32	not published	not published
32	34	not published	not published
34	36	36 (2 of 2)	38: J.Crew
36	38	38 (1 of 2)	40: J.Crew
38	40	40 (1 of 2)	42: J.Crew
40	42	42 (1 of 2)	44: J.Crew
42	44	not published	not published
44	46	not published	not published
46	48	not published	not published
48	50	not published	not published
50	52	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 DE 34: brand charts print anything from FR 36 to 38 for the same size.