Measuring String Left in Reel

Most who favour a particular brand of strings end up buying reels. 

However, many of my friends still get caught not knowing how much string there is left in the reel.

Depending on the brand, gauge and type of string, the more common strings weigh between 15 grams to 20 grams per set of 40 ft. It is easy to use weight as a proxy to estimate how much string there is left.

Below is a partially used reel of poly a friend handed to me. It weighs 331 grams.

He wanted 3 rackets strung with full poly, so I cut out 3 sets of 40 ft each, total 120 ft of string from the reel.

That left me with 275 grams.

The simple calculations that follow:

120 ft of string weighs 56 grams (331-275)

Each set of 40 ft weighs ~19 grams (56/3)

This full reel of strings only should weigh ~308 grams (56/120 x 660)

So when you next buy a new reel, measure and record the weight of the entire reel before using it. You will have a better idea how much string there is left.