Does Iran Have Nuclear Weapons? How Close Is Iran to a Bomb?

About nine to 12 months, by the most recent US intelligence estimate on record. In May 2026, US officials familiar with the assessment said the intelligence agencies still placed Iran nine to 12 months from being able to build a weapon, the same range they set after the June 2025 strikes. Before those strikes the estimate was three to six months. In July 2024, Secretary of State Antony Blinken said Iran’s breakout time, the time needed to make enough weapons-grade uranium for one bomb, was “probably one or two weeks.”

The clock slowed because the factories were hit, not the fuel. All three of Iran’s known enrichment plants, two at Natanz and one at Fordow, were destroyed or badly damaged in June 2025. The 60 percent stockpile, however, is believed to have survived, most of it in tunnels at Isfahan; IAEA Director General Rafael Grossi said on March 9, 2026, that a bit more than 200 kg was stored there. By the agency’s yardstick, about 42 kg of 60 percent uranium is enough for one weapon once enriched to about 90 percent. We track the numbers in How Much Enriched Uranium Does Iran Have?

The estimate rests on assumptions. It supposes that Iran can dig out and reach its buried uranium and enrich it again in a plant that inspectors have never seen, and some analysts say that is the optimistic end for Tehran. Grossi told the UN Security Council on October 27, 2026, that since June 2025 the agency had not identified “any activity to repair or reconstruct” the damaged sites, while warning that satellite monitoring cannot replace inspections.

There is no public evidence that it is. Grossi said on March 3, 2026, days after the war began on February 28, that the IAEA had found no evidence that Iran was building a nuclear bomb, while calling the stockpile of near-weapons-grade uranium a serious concern.

US intelligence has said much the same. In March 2025 Director of National Intelligence Tulsi Gabbard told Congress that the intelligence community assessed that Iran was not building a nuclear weapon and that Supreme Leader Ali Khamenei had not authorized the weapons program he suspended in 2003. In her written testimony on March 18, 2026, Gabbard said there had been no effort to rebuild Iran’s enrichment capability since the 2025 strikes; reading her statement aloud, she said instead that Iran was trying to recover from severe damage to its nuclear infrastructure.

Washington’s leaders put it differently. On March 4, 2026, President Donald Trump said, “If we didn’t hit within two weeks, they would’ve had a nuclear weapon,” and the White House says the 2025 strikes obliterated Iran’s nuclear facilities. Iran says it does not want a bomb: in March 2026 Foreign Ministry spokesman Esmaeil Baghaei said Iran “has never sought, and does not seek, nuclear weapons.”

Yes, until 2003. In its final assessment on December 2, 2015, the IAEA concluded that Iran ran a coordinated set of activities relevant to building a nuclear explosive device before the end of 2003, that some activities continued until 2009, and that it had no credible sign of such work after 2009. A US National Intelligence Estimate in 2007 had reached a similar judgment, that Iran halted its weapons work in the fall of 2003.

For two decades Tehran pointed to a religious ruling by Ali Khamenei that nuclear weapons are forbidden. Ali Khamenei was killed in a US-Israeli strike on Tehran on February 28, 2026, and on March 8 the Assembly of Experts named his son, Mojtaba Khamenei, as Supreme Leader. Any decision to build a bomb would now be his.

Because Iran promised not to build them. It signed the Non-Proliferation Treaty on July 1, 1968, and ratified it on February 2, 1970, as a state without nuclear weapons, and Article II of the treaty bars such states from making or acquiring them. Only five countries may hold nuclear weapons under the treaty: the United States, Russia, the United Kingdom, France and China. India, Pakistan and Israel built theirs outside it, as we set out in How Many Nuclear Weapons Does Israel Have?, and North Korea left it.

Iran could leave the treaty with 90 days’ notice, but it has not given that notice, and the government says it remains bound. UN sanctions on Iran, lifted under the 2015 nuclear deal, came back into force on September 28, 2025. The United States and Israel say they will not allow Iran a bomb, and Washington wants the stockpile removed in any settlement; on November 11, 2026, Mohsen Rezaei, secretary of Iran’s Supreme National Security Council, said “not a single particle of enriched nuclear material will leave Iran.”

It has the missiles, but not a proven warhead. Iran’s longest-range ballistic missiles, such as the Khorramshahr, are rated at about 2,000 km, enough to reach every Gulf base, Israel, Turkey, Cyprus and the edge of southeastern Europe, as we show in How Far Can Iran’s Missiles Reach? A missile warhead needs a device small and light enough to fit, and there is no public evidence that Iran has designed one.

US intelligence assessments in 2025 and 2026 said Iran could begin developing a militarily viable intercontinental ballistic missile before 2035 if it chose to, drawing on its space-launch rockets. Iran has not tested one.