Spool Remaining Calculator
Weigh a used spool to estimate its remaining grams, length and value.
Filament Weight & Length Converter
Convert mass, length and volume using your filament diameter and density.
Inputs
Material Summary / Results
Enter your inputs and calculate to see the result.
Theoretical solid filament geometry; density and diameter may vary.
Calculation method
Grams = meters × π × (diameter in mm ÷ 2)² × density in g/cm³. One meter of filament with a 1 mm² cross section has a volume of 1 cm³. One foot = 0.3048 meters.
How to use this tool
Choose the conversion direction and the corresponding input unit. Diameter and density are reference values, not brand guarantees. Measure the filament or consult its data sheet for a better estimate.
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Related guides
How to Convert Filament Grams to Meters
How can a mass reading be compared with a length-based estimate?
How Filament Diameter and Density Affect Length
Why do equal-weight spools contain different lengths?