Q. While studying the book of Revalation, I noticed in Rev 21:15 it gives the dimensions of heaven. If possible how does the size given relate to the way we measure things today. EX is it 1200 miles? I also heard it would be about the size of the Modern day U.S.
The measurement of the city described in Revelation chapters 21 and 22 is 12,000 furlongs. A furlong is 1/8 th of a mile. This makes the city about 1500 miles square, or 1500 miles in all directions. That is quite a large city. The total land area of the United States, including Alaska and Hawaii, is 3,717,796 sq miles. The literal land area of the city described in Revelation would be 2,250,000 sq miles. That would make the city a somewhat larger than 1/2 the size of the United States. In addition to that the wall of the city described in Revelation is 1500 miles high. That is an extremely high wall considering that most commercial airliners fly at an altitude of about 7 to 8 miles.
I have said these things to point out that the numbers in Rev. chapters 21 and 22 are not literal. They are figurative. They describe the holy city built by God which is defined in 21:9 as the Bride of Christ. According to scripture, the church which Jesus built on the day of Pentecost is the Bride of Christ. These numbers describe a spiritual city built by God. If you would like to take a look at my web site, http://www.churchofchrist.pair.com/revelation/index.htm you will find a couple of lessons dealing with the spiritual nature of the church and the meanings of the descriptions used in Rev. 21 and 22. It would be difficult for me to repeat all of that in an e-mail. I hope you will make a visit to the web site.
One other thing. This may seem a little strange to you considering the nature of your question, but just consider this for a moment. I have a difficult time believing that heaven will be as “small” as the city described in Revelation 21 and 22… even if the numbers were literal. Scientist who work with the Hubble telescope recently released pictures of our universe which contained galaxies as far away from the earth as 12 billion light years. That measurement is too great from most of us to even imagine. Now, God made this universe and the earth is only one tiny speck in the entire picture. Since God made this universe for man, I highly suspect that the heaven he creates for us to live in for all eternity will be a far greater place.