Soviet losses approx during the first six months of operation Barbarossa:

Soviet Weapons Losses in 1941 (The First Six Months Of The War):

http://www.wargamer.com/articles/lldocefx.asp

One of the most compelling reasons for Western Allied assistance to the Soviet Union was the incredible heavy losses of weapons and equipment caused by the German invasion. The following few examples illustrate the severity of the Russian losses. The percentage of Weapons available, lost by Soviet Forces during 1941:

56% of all Small-arms and Machine guns.
69% of all Anti-Tank guns.
59% of all Field guns and Mortars.
72% of all Tanks.
34% of all Combat Aircraft.



Approximately 20,000 Tanks and 10,000 Combat Aircraft were lost by Soviet forces in this period.


The article also includes very interesting data on lend lease.

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