I already did that in this calculation from earlier in the discussion:
Calculations for Eleven
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Total Electric Power Consumption in 1983: 1606.17 kWh (kilowatt hours)
1606.17 kWh = 5,782,212,000 joules (5.782212 × 10^9 joules in sci. notation)
1 Gram of TNT has 4184 joules.
5,782,212,000 (J)/4.184 (J/1 gram of TNT) = 1,381,981,836 grams of TNT (or 1.381981836*10^9)
(1.381981836*10^9)/(10^6 (kg of TNT)) = 1381.981836 kilogram tons
Eleven opening/closing the Gate requires several times more energy than Earth could produce in 1983, which equates to being 1.381981835564 Tons of TNT when running the joules consumed in 1983 through a converter provided by Google (joules to TNT Ton was the exact search requirement to bring up the converter).
From Stranger Things Wikia:
After Will's funeral, the boys asked Mr. Clarke about other dimensions and how to possibly travel to them. Using an acrobat and flea on a tightrope as a metaphor, he explained that inter-dimensional travel is currently impossible due to requiring a massive amount of energy that humans are not yet capable of. He then explained that, theoretically, if the energy requirements were met, it would create a tear in space-time, creating a doorway—or gate— to another dimension. When Mike asked if it was possible that such a gate already existed, Mr. Clarke responded that they would know as it would disrupt gravity, the magnetic field, the environment, and possibly "swallow them up whole."
Quote: Mr. Clarke: You guys have been thinking about Hugh Everett's Many-Worlds Interpretation, haven't you? Well, basically, there are parallel universes. Just like our world, but just infinite variations of it. Which means there's a world out there where none of this tragic stuff ever happened. Well Picture an acrobat standing on a tightrope. Now, the tightrope is our dimension. And our dimension has rules. You can move forwards, or backwards. But, what if right next to our acrobat, there is a flea? Now, the flea can also travel back and forth, just like the acrobat. Here's where things get really interesting. The flea can also travel this way along the side of the rope. He can even go underneath the rope. In this metaphor, yes, we're the acrobat. More than humans are currently capable of creating, mind you, to open up some kind of tear in time and space, and then you create a doorway. Well, if it did, I think we'd know. It would disrupt gravity, the magnetic field, our environment. Heck, it might even swallow us up whole.
From VS Battles Wikia: Atomization: Applied only if clearly stated. It describes the energy to separate all atoms in a chemical substance. The value is 30852.2 (j/cc).
Eleven was shown atomizing the Demogorgon
Height of the Demogorgon:
7 feet tall.