During the Second World War, Canadian industries manufactured war materials and other supplies for Canada, the United States, Britain, and other Allied countries. The total value of Canadian war production was almost $10 billion - approximately $100 billion in today’s dollars. . . .

Canadian industrial production during the Second World war.
11 billion dollars of munitions
1.7 million small arms
43,000 heavy guns
16,000 aircraft
2 million tonnes of explosives
815,000 military vehicles, 50,000 tanks and armoured gun carriers
9,000 boats and ships
Anti-tank and field artillery
Naval guns
Small arms and automatic weapons
Radar sets and Electronics
Synthetic rubber
Uranium for the ’Manhattan Project’ . . .

It lent money to Britain interest-free, gave it a gift of war supplies in January 1942 and then donated surplus production to Canada’s allies through the Canadian Mutual Aid Board.
Canada was making war production available to the Allied countries which could not afford to buy it. . . .

Canadian war factories were safe from bombing. Canada became an arsenal, and was Britain’s chief overseas supplier of war materiel.

Canada did not accept American Lend-Lease aid. Actually Canada ran its own lend-lease program for its allies called "Mutual Aid", supplying its allies with four billion dollars worth of war materiel. A further credit of a billion dollars was given to Britain. . . .

By 1945 Canada’s war production was fourth among the Allied nations, less only than that of the United States, the Soviet Union and the United Kingdom. Only some 30% of this was needed for Canada’s armed forces: the remainder went overseas.. . .

Another of the most important was the mass production of 815,729 military vehicles, including 45,710 armoured vehicles. Canadian-made vehicles were crucial in equipping the British Eighth Army in North Africa and Italy. Canada also produced rifles, submachine guns, light machine guns, antitank guns and antiaircraft guns, as well as the multipurpose 25-pounder artillery piece.
Britain had entered the war with 80,000 military vehicles of all types; however, 75,000 of these British vehicles were left behind in the evacuation at Dunkirk in 1940. Virtually defenceless on the ground, Britain turned to Canada - and particularly the Canadian auto industry - to replace what had been lost. Canada not only replaced these losses, it did much more.
Canadian industry produced over 800,000 military transport vehicles, 50,000 tanks, 40,000 field, naval, and anti-aircraft guns, and 1,700,000 small arms.
Of the 800,000 military vehicles of all types built in Canada, 168,000 were issued to Canadian forces. Thirty-eight percent of the total Canadian production went to the British. The remainder of the vehicles went to the other Allies. This meant that the Canadian Army ’in the field’ had a ratio of one vehicle for every three soldiers, making it the most mechanized field force in the war. . . .

Of a population approximately 11.5 million, 1.1 million Canadians served in the armed forces in the Second World War.