Convert Kilotons of TNT to Megatons of TNT

Convert Kilotons of TNT (kt(TNT)) to Megatons of TNT (Mt(TNT)) instantly and accurately.

From: Kilotons of TNT (kt(TNT))

To: Megatons of TNT (Mt(TNT))

Conversion Formula

Mt(TNT) = kt(TNT) × 0.001

About Kilotons of TNT

A kiloton of TNT (kt(TNT)) = 10³ tons of TNT = exactly 4.184 TJ. It is the standard unit for sub-megaton nuclear weapon yields. Hiroshima's Little Boy: ~12-18 kt; Nagasaki's Fat Man: ~19-23 kt. The W88 warhead (Trident II) is ~475 kt; the W76 is ~100 kt. The Beirut port explosion (2020): estimated 0.5-1.1 kt. A magnitude 5.0 earthquake releases ~0.5-2 kt of seismic energy. A kiloton blast creates a fireball ~90-100 m radius and a lethal thermal radius of ~1-2 km. 1 kt(TNT) = 4.184 TJ = 1,162.8 MWh.

About Megatons of TNT

A megaton of TNT (Mt(TNT)) = 10⁶ tons of TNT = exactly 4.184 PJ. The Soviet Tsar Bomba (1961) yielded ~50 Mt - the largest human-made explosion ever, with a fireball 8 km in diameter. Castle Bravo (1954) yielded ~15 Mt, 2.5× its 6 Mt design yield. Modern thermonuclear warheads typically range from 0.1-1.2 Mt. The 2011 Tōhoku earthquake released ~500 Mt in seismic energy. The Krakatoa 1883 eruption released ~200 Mt; Tambora 1815 ~33,000 Mt. 1 Mt(TNT) = 4.184 PJ = 1,162,800 MWh.

Quick Reference Table

Kilotons of TNT (kt(TNT))	Megatons of TNT (Mt(TNT))
1 kt(TNT)	0.001 Mt(TNT)
2 kt(TNT)	0.002 Mt(TNT)
5 kt(TNT)	0.005 Mt(TNT)
10 kt(TNT)	0.01 Mt(TNT)
25 kt(TNT)	0.025 Mt(TNT)
50 kt(TNT)	0.05 Mt(TNT)
100 kt(TNT)	0.1 Mt(TNT)

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