Simply (and obviously) put, pianos are heavy. Most of the weight associated with a piano of any kind comes from the solid, cast iron harp; the core feature of the instrument that holds all of the strings in place. No matter what size piano, add to the harp a heavy wooden sound board and specialized wooden casing, thousands of mechanical parts made of various materials and along with a lot more. Even the smallest pianos (spinets, consoles) easily weigh in at 300-400lbs or more.
Larger upright pianos vary in both size and height but usually start weighing in at around 500 lbs. The largest upright pianos can weigh up to 800 lbs or more and upright player pianos can easily weigh over 900 lbs. Grand pianos, of course, aren't any different.
The smallest grand pianos (usually 54 inches long) average in weight between 500-600 lbs. As grand pianos increase in size and length they naturally also become heavier. Larger grand pianos can weigh up to 1000 lbs and some of the largest "specialty" grand pianos weigh 1,200 lbs or more. So with an average weight of a quarter to over half of a ton, it's advisable not to take moving your piano "lightly!" Call the experts - Duffy Piano Moving and Storage has been moving these instruments for Philadelphians and their neighbors for over 100 years.