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Filament cost calculator
RUNS OFFLINEEnter your spool price and the print weight from your slicer. Cost updates instantly as you type. Need machine time, labor and batch pricing too? Use the full quote workspace.
= 20 ÷ 1000 ×100 × 1.1 =€0.00
= €0.00 material +€0.00 waste allowance
How the filament cost is calculated
Material cost is (print weight ÷ spool weight) × spool price. The slicer weight already includes supports, skirts and brims, so the extra waste percentage covers what the slicer can't predict — failed first layers, stringing, reprints. 10% is a realistic default for most prints. Purge/prime waste adds a fixed gram amount instead of a percentage, which matches how AMS color-change flush actually works. With copies above 1, the print weight is multiplied before any of this.
Want the full cost including electricity and printer wear? Use the print time cost calculator. Selling prints? Try price your prints.
Frequently asked questions
Where do I find the weight of my print?
Your slicer reports it after slicing — PrusaSlicer, OrcaSlicer and Bambu Studio all show filament used in grams on the print summary. Enter that number directly; weighing a finished part also works but tells you nothing about waste.
What waste percentage should I use?
Remember the slicer weight already includes supports, skirts and brims — the waste % here is extra on top of that, for failed first layers, stringing losses and the odd reprint. 10% is a realistic default; lower it for reliable setups and simple single-wall parts. For AMS/multicolor prints with a known flush volume, the purge grams field is more accurate than a percentage.
Is cost per gram just the spool price divided by 1000?
For a 1 kg spool, yes — price per gram is spool price ÷ spool weight, shown in the breakdown. A spool costing 20 at 1000 g works out to 0.020 per gram, whatever your currency.
How should I account for failed prints?
Divide by the success rate, don’t add a flat markup: at a 20% failure rate each good print costs 1 ÷ 0.8 = 1.25× the material, not 1.20×. Some tools apply failure as a simple markup and understate the cost. The price your prints calculator uses the correct ÷(1 − failure) math for material, machine time and labor.
Does this include electricity and machine wear?
No — this is material cost only. Use the print time cost calculator for electricity and printer amortization, or price your prints for a full sale price with labor and margin.