Getting started with the calculators
How a calculator page is laid out, how results update as you type, how the link keeps your inputs, and what Copy link and Reset do.
How to use the calculators
Where to find each input, how the defaults were chosen, how to share a filled-in calculator and how to read what comes out.
Help last revised
Read article
Finding your inputs
Where to find the numbers the calculators ask for: slicer grams and hours, spool price, electricity tariff, printer watts, breaker rating and enclosure size.
Defaults and sources
How each calculator's default values were chosen, which are cited figures and which are placeholders, how to override them, and what the check date means.
Reading your results
How the calculators round numbers, what the fits, tight and over verdicts mean, why results differ from slicer estimates, and when to call an electrician.
FAQ
Common questions about how the calculators work
Are the calculators free?
Yes. Every calculator is free to use, needs no account and carries no ads.
How accurate are the results?
Each result is only as good as its inputs. The formula and the default values are shown under every tool, so you can check the math and swap in your own numbers.
Where do the default material values come from?
Defaults such as filament density come from published manufacturer data sheets and are cited on the calculator page. Override any of them with your own measurements.
Can I share a filled-in calculator?
Yes. Your inputs are stored in the page URL, so copying the link shares the calculator with every value already filled in.
Is my data stored anywhere?
No. Calculations run in your browser and nothing you type is sent to a server.