List of countries by proven oil reserves

This list gives the oil reserve in Million Barrels.

1 ton = 7 barrels.

Complete List see Here

Total world oil reserve is 1,481,526 million barrels.
281,526 million tons
281 billion tons

So roughly, we can go with oil for 281/5=50 years, let’s say, in 30 years, we will run out of oil.