Toronto is 5.1 times larger than Boston.
Area: 129 km2 calculated
Boston is the capital and largest city of the Commonwealth of Massachusetts in the United States. Boston also serves as county seat of Suffolk County. Wikipedia
Area: 665 km2 calculated
Toronto is the most populous city in Canada and the provincial capital of Ontario. It is located in Southern Ontario on the northwestern shore of Lake Ontario. The history of Toronto began in the late 18th century when the British Crown purchased its land from the Mississaugas of the New Credit. Wikipedia