3D printing filament is sold in spools classified by weight. They are often in 500-gram or 1-kilogram spools, although there are both bigger and smaller options. This is likely the most convenient unit of measurement in terms of sales and logistics.

Unfortunately, it’s easier to estimate how long a spool would last if you knew exactly how long the filament is. Here is a handy way to calculate for the meters of filament in your spool given its weight.

How to Calculate The Length?

Based on our calculations, there are around 333 meters of filament in a 1-kilogram spool of PLA filament with a diameter of 1.75 millimeters. Take note that these calculations assume that the diameter of the filament is perfectly consistent throughout its length.

This approach may be used for any type of filament or spool SKU. You can also use the same calculations to estimate the length of leftover filament in a spool that has been partially consumed if you have a weighing scale at home. Just make sure to account for the weight of the empty spool.

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