How much does Astro Boy (Tobe) weigh?

Use your imagination. I mean he can't get crushed. I saw him when he lifted Zog's foot from smashing that one guy. I just want to know what your opinion is. How much does he weigh? If you think Astro Boy has human weight then let me know or if he is just super strong. Once he was trying to lift Metro City from falling it landed right on top of him and he survived. It was on top of his whole body too. Give me your weight and also tell me why you think he weighs that much and I promise you I will give the best answer ten points. And also tell me if you think he is strong too.