Depends on who's included in the count.
Heaven: 2, to hell: billions.
God and Jesus are the only non-angelic beings in heaven at this time. And, since 'hell' is the place where people are buried, or more generally where the dead are, all humanity that have died thus far are in hell. Hell is not a place of fire and torture, as is commonly supposed.
However, after the return of Jesus Christ, the ratio will be vastly changed. (For this I interpret your reference to 'heaven' as the Kingdom of God, since nowhere in the Bible does it say that people will go to heaven.) All those who have put God's Way of life first in their lives will be resurrected into the Kingdom of God. But, the ratio will still favor those who are dead and "in hell."
It won't be until after the 1000 year reign of Christ on the earth that the vast majority of people will be resurrected to life and offered, for the first time, the opportunity to enter into the Kingdom of God.
At the end of that period of judgment, I believe that the ratio will finally turn around to favor, by a very wide margin, those who have changed their lives and been judged worthy to enter the Kingdom of God. The remaining few will not be sent back to their graves, but rather they will be completely and utterly destroyed in the Lake of Fire, never to live again (their spirits destroyed).