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3D Printing Filament Estimator

Weight ↔ length ↔ cost. Estimate remaining filament by spool weight or dimensions. Everything runs locally, ad-free.

Material (density)

Density ρ (g/cm³)

Diameter

Custom diameter (mm)

Price per kg (optional)

Net filament grams (if known)

Gross spool weight g

Empty spool weight g

If “Net grams” is empty, we’ll use gross − empty. Leave these blank if you prefer the dimensions method below.

Spool outer diameter D_o (mm)

Spool inner hub D_i (mm)

Wound width W (mm)

Packing factor k (0–1)

If “Net grams” and “Gross/Empty” are blank, we’ll estimate remaining length from spool dimensions using k·π·W·(D_o²−D_i²)/(4·A).

g per metre: –

m per kg: –

Remaining grams: –

Estimated metres remaining: –

Cost per metre: –

Cost of remaining: –

Assumes round, solid filament and constant density. CF-filled materials vary by brand — adjust density if known.

Estimator mode

Safety margin (%)

Required length (m)

Required grams: –

Required metres: –

Estimated material cost: –

For volume-based estimates we use mass = ρ · volume. For length-based, we use g per metre. Both include your safety margin.