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Easily calculate 3D printer filament usage by length or weight with our free online calculator. Supports all materials, units, and filament sizes.
Ever started a 3D print and wondered, "Do I have enough filament left?"
You're not alone. Knowing how much filament a print will use saves time, money, and frustration.
We’ve built this 3D printer filament usage calculator to make that super easy. Whether you're planning a large print or managing a tight budget, our tool tells you how much filament you'll use in grams, meters, or dollars. It's fast, free, and beginner-friendly.
When your printer lays down plastic, it's using filament. This filament is a spool of plastic, often PLA or ABS. It comes in different sizes, weights, and materials. Every print consumes a bit of it some tiny, some a lot.
To avoid surprises (like your spool running out mid-print), it's smart to calculate filament usage before starting.
We’ve done the math so you don’t have to. But here’s the simple formula used behind the scenes:
Filament Mass = Density × π × (Diameter ÷ 2)² × Length
Let’s break that down:
If you already know the weight of the filament used (say from slicer software), you can reverse the math to find the length:
Length = Mass ÷ (Density × π × (Diameter ÷ 2)²)
All this is handled instantly by our calculator. Just enter your values and boom—you get your result.
Using our tool is easy. Just follow these steps:
You’ll instantly see:
It’s fast, clear, and accurate.
Say you want to print a model that uses 100 meters of PLA (1.75 mm diameter).
The calculator tells you that it’ll use around 298 grams of filament.
Have a 1kg spool? You’re good to go!
Or say you’ve only got 250g left on a spool and want to know if it's enough.
Pop in your mass, and we’ll tell you how many meters that gives you.
You might hear about the "5mm rule." It means always keeping at least 5mm of filament exposed above the extruder to avoid jams or underfeeding. It doesn’t affect filament calculation but helps avoid hardware issues.
It depends on what you’re printing. For example:
On average, 1kg of PLA equals about 330–340 meters of 1.75mm filament.
Again, assuming 1.75mm PLA:
3D printing is fun but wasted filament isn’t.
Our free 3D printer filament usage calculator helps you print smart and plan better.
It works for any filament type, diameter, or unit. Whether you’re a hobbyist or a pro, this tool helps you print confidently without waste.
Yes! Just choose the right density or enter a custom one.
You can use mm, cm, meters, inches, feet for length, and grams, kg, oz, lb for mass.
Absolutely. It uses real physics-based formulas and supports custom inputs.
Most filaments list it on the spool or datasheet. PLA is usually 1.24 g/cm³.