Google didn't give me satisfactory results, so I'm turning to the Playground for help: What's the density of a pumpkin (I'm trying to calculate the weight of one for a contest)? If you happen to have a (mostly spherical) one on hand, I could calculate it myself, but I'd need the weight or mass and the radius or diameter. Those, of course, wouldn't be quite accurate to the pumpkin I have to measure, but the density would be about the same. Then, I would just have to measure "my" pumpkin and calculate the volume of an ellipsoid.