“The 1815 eruption is rated 7 on the Volcanic Explosivity Index, the only such eruption since the Lake Taupo eruption in about 180 CE. With an estimated ejecta volume of 160 cubic kilometers, Tambora’s 1815 outburst was the largest volcanic eruption in recorded history.”
(…)
“It had roughly four times the energy of the 1883 Krakatoa eruption. An estimated 160 cubic kilometers (38 cubic miles) of pyroclastic trachyandesite was ejected.”
en.wikipedia.org/wiki/Mount_Tambora