Filament cost per print
Total for all prints
Price per gram
Filament used per print (with waste)
How filament cost per print is worked out
Your slicer reports the weight of a model in grams. Divide the spool price by the spool weight to get a price per gram: a 1 kg spool at $20 costs $0.02 per gram, so a 100 g print uses $2.00 of filament before waste.
Why waste matters
Skirts, brims, purge towers, failed first layers and colour changes all use filament that never ends up in the finished part. A flat 5% is a reasonable starting point for single-colour prints. Multi-material printing can waste far more, so weigh a spool before and after a few jobs and use your own number.
Slicer weights are estimates and can differ a little from the real part. This calculator is for planning only.