http://www.historynet.com/did-russia-re ... ermans.htm
Particularly important for the Soviets in late 1941 were British-supplied tanks and aircraft. American contributions of the time were far fewer. In fact, for a brief period during December 1941, the relative importance of British aid increased well beyond levels planned by the Allies as a result of American reaction to the outbreak of war with Japan; some American equipment destined for the Soviet Union was actually unloaded from merchant vessels and provided to American forces instead.
. By the end of 1941 Britain had delivered 466 tanks out of the 750 promised.
A steady stream of British-made tanks continued to flow into the Red Army through the spring and summer of 1942. Canada would eventually produce 1,420 Valentines, almost exclusively for delivery to the Soviet Union. By July 1942 the Red Army had 13,500 tanks in service, with more than 16 percent of those imported, and more than half of those British
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That means that the Soviets already had more than 2000 imported tanks by mid-1942.
A total of 699 Lend-Lease aircraft had been delivered to Archangel by the time the Arctic convoys switched to Murmansk in December 1941. Of these, 99 Hurricanes and 39 Tomahawks were in service with the Soviet air defense forces on January 1, 1942, out of a total of 1,470 fighters. About 15 percent of the aircraft of the 6th Fighter Air Corps defending Moscow were Tomahawks or Hurricanes.
Once again, raw figures do not tell the whole story. Although British shipments amounted to only a few percent of Soviet domestic production of machine tools, the Soviet Union could request specific items which it may not have been able to produce for itself. Additionally, many of the British tools arrived in early 1942, when Soviet tool production was still very low, resulting in a disproportionate impact. The handing over of forty imported machine tools to Aviation Factory No. 150 in July 1942, for example, was the critical factor in enabling the factory to reach projected capacity within two months.
I don't know how to convert the LL itens in their practical utility, but certainly the material help to the Soviets was significative, and without the Soviets in the war it would be all avaliable to Britain.