Free Online Calculators
Print weight → cost, filament length & print time
This calculator tells you how much filament your 3D print will use — showing material cost, filament length in metres, volume and a rough print-time guide (5 g per hour). Just enter the print weight, filament diameter (1.75 mm or 2.85 mm), material, spool weight and spool price. It's the quickest way to plan your prints and keep material costs under control.
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Slice the model first — your slicer reports the filament length and weight for the exact settings you chose. If you only know the length, convert it to volume using the strand's cross-section and multiply by the material density to get grams.
Yes, filament and print cost calculators are freely available online, including this one. Here you enter the print weight, filament diameter, material, spool weight and spool price to get the material cost per print; electricity is not included.
Divide the spool price by the spool weight in grams — that gives you the cost per gram for your specific material and brand. Standard PLA sits at the low end, while engineering materials like PC, PA or carbon-filled blends cost several times more per gram.
Multiply your cost per gram (spool price divided by spool weight) by one hundred. For a common PLA spool this is a small fraction of the spool price, since a standard spool holds many times that amount.
That is a full standard spool for most brands, so the price equals the spool price you paid. Enter the spool price and weight in the calculator to see the cost per gram and per print.
It's a moderate amount — enough for a medium-sized functional part or several small prints, but only a fraction of a standard spool. Large decorative or structural prints can easily exceed it.
Take the spool price, divide it by the spool weight to get a cost per gram, then multiply by the weight of your print from the slicer. Add electricity cost (printer wattage times print time times your energy tariff) and a waste allowance for purges and failed prints.
One of the most common questions before hitting "print" is simple: how much filament will this actually take? Whether you're running a print farm or just making a single prototype, knowing your filament usage upfront saves money and prevents mid-print failures from running out of material. This calculator converts filament weight to length, estimates material cost, and adds a rough print-time guide — all in one place.
The math behind filament usage isn't immediately obvious. A 1 kg spool doesn't tell you how many meters you have — that depends entirely on the material's density and the filament diameter. For example, 1 kg of PLA at 1.75mm diameter gives you roughly 335 meters of filament, while the same weight of ABS (1.04 g/cm³, much lighter) yields about 400 meters. Getting this wrong means either buying too much material or, worse, watching a long print fail at hour six because you ran out.
Understanding your true print cost matters whether you're pricing jobs for customers or just tracking personal project expenses. A typical 200 g functional bracket in PLA costs roughly $3 to $5 in raw filament with spools at $15–25 per kilogram, depending on the brand. PETG and ABS sit in a similar price range, while specialty materials like Nylon or flexible TPU can push your per-print cost significantly higher.
This filament calculator lets you input your spool cost, total spool weight, and the estimated filament usage for a given print to get a precise cost per print figure. If you're selling prints, this is your baseline — you still need to factor in electricity, machine wear, and time, but filament cost is usually the biggest variable. On simple-calculator.online, the calculator supports six common materials: PLA, PETG, ABS, TPU, Nylon, and ASA, each with pre-loaded density values so your weight-to-length conversion is accurate without manual lookup.
The print time shown is only a rough guide: the calculator assumes 5 g of filament per hour, so a 50 g print shows 10 h 0 min. Real print times depend on speed, layer height, infill and the printer — use your slicer's estimate when you schedule jobs or quote turnaround times.
Start by pulling the filament weight from your slicer software — Cura, PrusaSlicer, and Bambu Studio all display estimated filament usage in grams before you export the G-code. Enter that weight into the calculator along with your material type and spool price, and you'll get the length used, the material cost and the rough time guide instantly.
For multi-material prints or prints with support structures, run the calculation separately for each material and add the results. It only takes a few extra seconds and gives you a much more accurate total cost breakdown.
Slice your model in any slicer software (Cura, PrusaSlicer, etc.) and check the filament estimate before printing. It will show the grams used — enter that figure here and the calculator converts it to meters.
They're usually similar in spool price, but PETG is slightly denser than PLA, so the same weight yields a bit less filament length. Cost per print ends up very close between the two materials.
Yes — the material cost output gives you a solid cost floor for quoting jobs. Add your electricity rate and desired margin on top of the filament cost for a complete pricing model.