impact factors for IUCr journals

All IUCr Journals are tracked by Thomson Scientific (ISI). A summary of the impact factors for IUCr Journals is given below.

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	1997	1998	1999	2000	2001	2002	2003	2004	2005	2006	2007
Acta Crystallographica Section A	1.806	2.146	1.601	1.491	1.749	1.417	1.558	1.829	1.791	1.676	2.385
Acta Crystallographica Section B	1.463	1.612	1.700	1.734	1.955	2.026	3.643	5.418	1.910	2.172	2.163
Acta Crystallographica Section C	0.459	0.577	0.581	0.543	0.570	0.659	0.828	0.728	0.777	0.896	0.719
Acta Crystallographica Section D	2.118	2.244	2.935	3.067	2.124	1.760	2.208	1.693	1.401	1.687	2.620
Acta Crystallographica Section E							0.453	0.491	0.581	0.567	0.508
Acta Crystallographica Section F											0.645
Journal of Applied Crystallography	1.988	1.569	1.901	1.752	2.583	1.871	2.324	3.534	5.248	2.495	3.629
Journal of Synchrotron Radiation	1.688	1.874	1.114	0.924	1.519	0.885	1.144	1.919	2.392	2.38	2.978

Impact factors are generally calculated based on a three-year period. For example, the 2007 impact factor for a journal would be calculated as follows:

2007 Impact Factor = A/B

where A = number of times articles published in 2005-2006 were cited in tracked journals during 2007 and B = number of articles published in 2005-2006.