Fissile material stocks
The global inventory of highly enriched uranium (HEU) is estimated to be about 1370 ± 125 tonnes as of the end of 2014. The global stockpile of separated plutonium as of the end of 2014 is estimated as 506 ± 10 tonnes, of which about 272 tonnes is the material in civilian custody.
|Non-civilian Pu, tonnes||Civilian Pu, tonnes|
Numbers for weapon plutonium for the United States and United Kingdom are based on official data. Most numbers for civilian plutonium are based on declarations submitted to IAEA and reflect the status as of December 31, 2014. Other numbers are non-governmental estimates, often with large uncertainties. HEU amount for Russia is 90% enriched HEU equivalent. The totals are rounded. See individual country entries for details.