Original calc. Credit to some guy on Naruto Forum calcing this in the first place, and credit to Matthew Schroeder for bringing it here.
After discussing here, we should either use 0.77, 0.92 or 1 as the emissivity.
Credit to Kepekley23 for the scaling.

- Ring finger diameter = 28px = 19.8mm (average ring size for men is 10)
- Edge size = 164px = 0.115971428571m
- Surface area = 6*0.115971428571^2 = 0.08069623346m²
Credit to Zanybrainy2000 for the calculation.
Low-end: 0.77*5.6703e-8*120000000^4*0.08069623346 = 7.30592165e23 Joules, or 174.61571821223708412 Teratons of TNT - Large Country level
Mid-end: 0.92*5.6703e-8*120000000^4*0.08069623346 = 8.72915314e23 Joules, or 208.63176720841300948 Teratons of TNT - Large Country level
High-end: 1*5.6703e-8*120000000^4*0.08069623346 = 9.48820994e23 Joules, or 226.77366013384320809 Teratons of TNT - Large Country level
And credit to myself for making this blog. :P
So what-end does my fellow calc group members support?
Use 0.77: Kepekley23
Use 0.92: TataHakai, Zanybrainy2000, Me
Use 1: No one yet
Still Large Country level anyway. Consistency is consistency.