All items in this post are sourced from publicly available information. Like all By The Numbers posts, this is intended to be a reference for your information and use, updated regularly, with every item linked back to a source document for further information. Since many details of the Iranian program are sketchy, these numbers are subject to frequent change and may deviate from other published sources.

• 3:: Number of known Iranian research reactor sites ¹
• 2:: Number of known Iranian uranium enrichment plants: Qom and Natanz ²
• 10 to 15:: Possible number of secret Iranian nuclear development sites, including recently revealed Qom site. ³
• 1,400:: Number of uranium mines claimed by Iranian Government⁴
• 36,000+: Proven Iranian Uranium Reserves available for mining, in tons ⁵
• Less than 1%: Percentage of naturally occurring uranium composed of the fissile uranium isotope U-235 ⁶
• 176:: Approximate number of kilograms of natural Uranium needed to produce 1 kg of highly enriched uranium. ⁷
• 30:: Annual highly enriched uranium production capacity, in grams, of a typical gas centrifuge. ⁸
• 1,000 – 3,500:: Number of centrifuges required to produce the 20-25 kg of highly enriched uranium needed for one implosion weapon per year. ⁹
• 8,000:: Estimated number of gas centrifuges in Iran. It’s estimated that 4,600 are in use ¹⁰
• 50,000:: Number of gas centrifuges planned for the Natanz enrichment plant. ¹¹
• 60,000: Estimated size in square meters of two main underground enrichment halls at Natanz site ¹²
• 3,000: Estimated centrifuge capacity of recently disclosed Qom plant ¹³
• 20,000:Number of barrels of gasoline to be exported daily by Venezuela to Iran under an agreement announced 7-Sept-2009. Despite being the fifth-largest oil exporter in the world, Iran has the refinement capacity to meet only about 60 per cent of its needs. ¹⁴
• 2: Possible number of Venezuelan uranium mines in Amazonas state,¹⁵
• 50,000: Estimated Venezuelan Uranium Reserves, in Tons ¹⁶