PLA
PETG
TPU
ABS
Digital kitchen scale
Digital calipers
Filament dry box
Desiccant packs
Spool holder
Creality K2 Pro Combo (enclosed, multicolor)Weigh the spool
Put your current spool on a scale. Then weigh an empty spool of the same type, if you know it.
100% free 3D printing tool
Free 3D Filament
Calculator & Checker
Track every spool, work out exactly what you have left, and see the feet, meters, dollars and printing hours still on the shelf. No account required.
✓Free forever, no account required
✓Saved privately in your browser
✓Works with PLA, PETG, ABS, TPU and more
FREE FILAMENT CALCULATOR
Calculate how much filament is left
How much filament do you have left? Weigh your spool, enter the basics, and we’ll handle the math.
Gear for your setup
Everything near your printer, in one place
Useful things to have on hand when you track your spools. These are shortcuts to Amazon searches, so you can compare brands and prices yourself.
Filament
Weigh and measure
Keep it dry and organized
Thinking of upgrading your printer?
As an Amazon Associate I earn from qualifying purchases. Prices, shipping and availability are set by Amazon and may change.
MY FILAMENT
Your free private spool inventory
Save spools on this device and keep track of the whole collection. No account or server required.
Spools0tracked on this device
Filament0 gremaining
Length0 ft0 m total
Estimated value$0.00remaining filament
Print time0 minat your saved rates
Private by design: your inventory is stored in your browser’s local storage. Use Export backup if you want a file you can keep or move to another device.
HOW IT WORKS
Three simple steps
You don't need a slicer, account or spreadsheet for the basic calculation.
Enter your details
Choose the material and diameter, then enter the original, empty and current spool weights.
Use the result
See grams, feet, meters, value and estimated print time. Save the spool to your inventory if you want.
How do I know how much filament is left?
The easiest method is to weigh the spool you are using, then subtract the weight of the empty spool. The result is the approximate grams of filament still on the roll.
Current spool−Empty spool=Filament remaining
How is filament length calculated?
Length is estimated from the remaining filament weight, material density and filament diameter. Because real filament density can vary by material and manufacturer, the length result is an estimate rather than a laboratory measurement.
Why show feet and inches as well as meters?
3D-printing users work in both metric and imperial units. The tracker shows both so you don't have to convert them yourself. The imperial result is rounded to the nearest inch.
How is printing time estimated?
The tracker uses your average grams-per-hour figure. For example, 327 g remaining at 12 g/hour is approximately 27.25 hours of printing. This is intentionally an inventory estimate, not a replacement for the model-specific material and time numbers in OrcaSlicer, Cura, PrusaSlicer or Bambu Studio.
How can I keep track of many spools?
Save each spool to My Filament. You can search and filter your inventory, see total remaining filament and value, flag low spools, and record where each spool is stored. Everything is saved locally in your browser.
GUIDES
Filament guides & cost explainers
Short, practical reads on what prints use, what they really cost, and how to keep track of every spool.
How much filament does a print use?
Phone cases, planters and helmets worked out in grams, meters and dollars — plus the spool math behind the numbers.
PLA vs PETG vs ABS: true cost
Density, failure-rate waste and moisture spoilage compared — why the cheapest spool is rarely the cheapest print.
Track filament usage
Four ways to know what is left on a spool, and the 30-second check to run before any long print.
How much does 3D printing cost?
Filament, electricity, wear and failed prints added up in one worked monthly example.
FAQ
Filament calculator FAQ
Simple answers for the things 3D-printer owners run into all the time.
Is this filament calculator really free?
Yes. It is completely free to use — no account, no sign-up, no hidden limits. Your spools are saved privately in your own browser.
What does the filament checker show?
It shows the grams, feet, meters, dollar value and estimated printing hours left on your spool. Enter your empty spool weight and the current scale weight, and the calculator does the rest.
How do I know how much filament is left on a spool?
Weigh the spool with the remaining filament, subtract the weight of the empty spool, and use the result as your remaining filament weight. The calculator above does that subtraction for you.
Can I calculate filament length from grams?
Yes. The tracker estimates length from filament weight, material density and diameter. Choose the material and filament diameter, or enter a custom density when you know the manufacturer's value.
How many feet are in a 1 kg spool of PLA?
It depends on filament diameter and the PLA's density. Use the calculator with 1,000 g and your diameter to get an estimate in feet and inches as well as meters.
How accurate is the filament length calculation?
It is an estimate. Density varies between materials and manufacturers, and the exact filament diameter may vary slightly. Use the density published by your filament manufacturer when available.
Can I use this for PETG, ABS and TPU?
Yes. The calculator includes common materials and a custom-density option for other materials or manufacturer-specific values.
Does this replace OrcaSlicer or another slicer?
No. Slicers tell you what a specific model is expected to use. This tracker helps you understand what is already on your spool and how long that remaining inventory may last based on your average usage.
Do I need an account?
No. The calculator works without an account, and saved spools are stored locally in your browser on this device.