Quadrillion (quad)

General & non-SICurrent unit

10¹⁵ in the short scale.

1 quadrillion = 1×10¹⁵ pieces (exactly).

1 quadrillion = 1×10¹⁵ pieces

About the quadrillion

Quadrillion is 10¹⁵, a thousand trillion, on the short scale, and it is a number most people meet only through energy statistics. The U.S. Energy Information Administration defines a quad as a quadrillion British thermal units and notes that national energy use typically reaches quadrillions of Btu. Its examples include 35.43 quads from petroleum, 33.61 from natural gas, and 8.17 from coal.

The name uses the Latin quadri-, four. It appears among the terms in Nicolas Chuquet's unpublished manuscript of 1484, alongside byllion and tryllion. On the long scale the same 10¹⁵ is called a billiard, and a quadrillion means 10²⁴. The SI prefix for 10¹⁵ is peta-. A quadrillion seconds is about 31.7 million years.

Sources: U.S. EIA: British thermal units (Btu); Wikipedia: Names of large numbers; BIPM SI Brochure, 9th edition (2019)

Quadrillion conversion chart

1 quadrillion expressed in every other counting & quantity unit:

Unit1 quadrillion
Pieces1×10¹⁵
Dozens83,333,333,333,333
Lakhs10,000,000,000
Millions1,000,000,000
Crores100,000,000
Billions (short Scale)1,000,000
Pairs500,000,000,000,000
Hundred10,000,000,000,000
Gross6,944,444,444,444
Thousand1,000,000,000,000
Trillions (short Scale)1,000
Score50,000,000,000,000
Half Dozens166,666,666,666,667
Reams2,000,000,000,000
Moles1.660539067×10⁻⁹
Baker's Dozens76,923,076,923,077
Small Gross8,333,333,333,333
Great Gross578,703,703,704
Myriads100,000,000,000
Yi / Oku10,000,000
Arab (Indian)1,000,000
Kharab (Indian)10,000
Billions (long Scale)1,000
Quires40,000,000,000,000

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