Tri-Chord Piano Strings


Ok time to do the math.  Here’s the question of the day: How many pounds of string tension are there on one piano, meaning… each string is tightened to produce tone – how many pounds of tension are the combined strings?  Well to answer that, you need some data.  First of all, how many pounds are pulling on one wire? The answer – on average, about 160 lbs.  Next question – how many wires are on a piano?  Well this varies greatly from piano to piano.  “IT DOES?”, you ask.  Yes – it all depends on the design or “scale” of the piano, the length, and the amount of bass strings there are.  “Well aren’t there the same notes on each piano?” 

Bi-Chord Piano Strings


Yes, of course there are 88 notes on each instrument but if you’ve ever looked inside you’ll see that there are Monochord, Bichord and Trichord strings.  (Think: Monocycle, Bicycle and Tricycle – need i say more?)  Some notes have one string, some two and others three.  Depending on the manufacturer, the length of the piano (usually longer has fewer bass strings), string amounts will vary considerably.  All pianos have “crossover” meaning that the copper bass strings cross over the steel wire strings.  Sometimes that crossover point is quite high on the piano, sometimes it’s lower.  Having said ALL that… on average there are about 225 wires on a piano (45 bass strings and about 180 treble strings).  

Mono-Chord Piano Strings


 So whipping out my handy dandy calculator… 160 pounds of pressure on 225 strings (on average) = 36,000 pounds! or about 18 tons of string tension.  This necessitates having a cast iron frame (which in turn makes the piano REALLY heavy). There…. small piece of trivia you can talk about at the next cocktail party. Enjoy!