There are some that do. Small upright pianos stand 43 inches high and can weigh from 300 to 400 lbs.

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How much does a keyboard weigh. Size and weight height. Grand pianos come in a variety of sizes including. The magic keyboard features sleek new design and a rechargeable battery that powers it for a month between charges and pairs automatically with your mac. 452 inches 1149 cm. This just isnt true. How much does this keyboard weigh.
Large upright pianos stand from 48 to 60 inches tall and weigh from 600 to 1000 lbs. 016043 inch 041109 cm width. It turns out that a 129 inch ipad pro with the magic keyboard comes in slightly heavier than a 13 inch macbook air and in fact closer to the weight of a macbook pro. The specs say it weighs about 52 pounds. 527 lbs or 239043 kg. The 129 inch ipad pro and magic keyboard weigh in at 3 pounds 1362 grams more than the 28 pounds 1290 grams of the 13 inch macbook air but the same as the 13 inch macbook pro.
The average weight of an upright piano. 1098 inches 279 cm depth. A weighted hammer action 88 key mechanism will weigh 20 pounds or so and that doesnt include the electronics. Other significant factors include the amplifier and speakers if any. However most come in closer to 400 and 500 lbs. You will notice that a lot of people claim that upright pianos weigh around 300 lbs.
Small grand pianos which stand 4 ½ to 5 feet tall and weigh 400 to 500 lbs. For much of the pressure treated lumber available today for residential use the additional weight will be less. If you are attempting to move a piano the easiest way is to have two people and to use a 4 caster dolly. Ground contact lumber treated with the widely used ca c copper azole type c for instance will only weigh about 037 more than untreated wood. So for a piano with a full size mechanical keyboard with an amp and speakers that sound like the real thing expect something in the 100300 lb category.