So, this guy who looks like a gal shoots a beam that launchs Meliodas a few meters/kilometers away than explodes
The feet[]
So, there is a mountain right there, so I suppose we can use that to scale, if I recall, we use 609.6 meters for an elevation to be considered a mountain, so
The mountain is 358 px, giving us 1.7027932960893855 meters per pixel
The explosion diameter is 1174 px, or 1999.079329608938577 meters for its diameter and 999.5396648044692885 meters for its radius, almost 2 Km, nice
It looks like the explosion happened airborne, so I'll use this little formula
R = Y^(1/3)*0.28
R = Radius in Kilometers
Y = Yield in Kilotons
0.9995396648044692885 = Y^(1/3)*0.28
Y = 45.49105457549816240813 Kilotons of TNT, or Town level
Lower by a long margin to what he is currently, F