This is more a test than a recalc
Calculation (Low-End)[]
Area[]
Mountain (Pink Line) = 70 px / 610 m
Crater Width (Red Line) = 465.25 px / 4054.32142857 m
Crater Length = 502.77 px / 4381.28142857 m
Formula for an ellipse is πab, where a and b is radius
π * 2027.16071429 * 2190.64071428 = 13951124.3221 m²
13951124.3221 / 2 = 6975562.16105 m²
Height[]
Entrance Width = 125.85 px / 4054.32142857 m
Panel Height = 401 px
2*atan(tan(70/2 deg)*(125.85/401)) = 24.78788340405 degrees
Using the Angular Size Calculator gets 9224.7 m
Volume/Destruction[]
6975562.16105 * 9224.7 = 64347468267 m³
64347468267 m³ = 6.4347468267e+16 cm³
6.4347468267e+16 * 214 (pulverization of rock) = 1.3770358e+19 J
Calculation[]
Assuming Danafor is equal in size to Liones, which was mostly enveloped by an attack with a 3 mile radius
Area[]
Crater Length = 502.77 px / 9656.064 m
Crater Width = 465.25 px / 8935.46511 m
Formula for an ellipse is πab, where a and b is radius
π * 4828.032 * 4467.73255 = 67765271.0616 m²
Height[]
Entrance Width = 125.85 px / 8935.46511 m
Panel Height = 401 px
2*atan(tan(70/2 deg)*(125.85/401)) = 24.78788340405 degrees
Using the Angular Size Calculator gets 20331 m
Volume/Destruction[]
20331 * 67765271.0616 = 1.3777357e+12 m³
1.3777357e+12 m³ = 1.3777357e+18 cm³
1.3777357e+18 * 214 = 2.9483544e+20 J
Final Tally[]
Demon Meliodas' AP (Low-End) = 3.29119460065 Gigatons (Large Mountain level+)
This is higher to some extent — high enough to make anyone Island level if they're a single gigaton stronger.
Demon Meliodas' AP (High-End) = 70.4673613289 Tons of TNT (Island level+)