I'd like to go back to what that person said 1 or 2 page ago about namek being at least 8.8 millions km long (it's actually a lowball because it's the distance between him (Frieza) and someone, not the actual size of the planet so unless he is at the other side compared to that person, namek is likely even bigger than that. But if we pretend 8.8 millions KM is what you'd need to cross to get to the other side of planet namek it means Namek's radius is 8.8 millions KM (assuming the device does not consider circumference and does it "as the crow flies").
Earth's radius is 6 371.0097714 km
if Namek's radious is 8 829 401 km it's 1385.8715206553 times bigger than the earth's radius so in terms of Volume, Namek is a "sphere" that can contain 2 661 760 100 times planet Earth. Which makes it 2 000 (since the shun can contain a bit more than 1 200 000 planet Earth in volume) times more voluminous than the sun. If we estimate the sun is a small star then since planet namek is 2 000 times more voluminous, according to our page about
attack potency Frieza is large star level (lowest small star level is 7.505x10 to the 30th power (in terms of energy in tonnes of TNT equivalent). And to reach large star level you need to get 7.605x10 to the 32nd power. Multiplying it by 2 000 is more than enough. Frieza even at Namek Saga in his final form and anyone who scales above or around him is large star level easily.
Edit stupid mistake: 8.8 millions would be Namek's diameter not namek's radius. Still I believe it qualifies for large star level