Spool remaining filament calculator

Put the spool on a kitchen scale, pick your spool brand, and see exactly how much filament is left — in grams, meters, and money. Wet spool? Check the drying times first; need grams for a given meter count, use the filament length to weight calculator.

Estimate only — tare weights vary by batch and spool revision. For an exact number, weigh an empty spool of the same brand and use the custom tare field.

How it works

The scale reads spool + filament, so remaining = scale − tare. The tare presets are a community consensus of typical empty-spool weights (compiled by spool trackers such as filamiq and sigmafilament) — cardboard spools are light (~140 g), plastic ones heavy (up to ~250 g). Meters are derived from the material density and strand cross-section, exactly as in the filament length to weight calculator. The value line prices the remainder at your per-spool price — the filament cost calculator does the same per print.