Convert between quads and other major units of energy.
In the United States, 1015 (1 quadrillion, American style) British thermal units, approximately 1.055 × 10¹⁸ joules. This unit is used for such purposes as reporting the total annual energy consumption in the American economy. One quad is roughly the amount of energy in:
“A proposed large unit of length = ten million metres, or approximately the length of an earth quadrant.”
A Dictionary of Metric and Other Useful Measures.
London: E. & F. N. Spon, 1891.
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Last revised: 3 August 2011.