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GNU Units vs bcal: catalog facts
GNU Units	bcal
Free Free software under the GPL, part of the GNU Project.	Free Free and open source under the GPL-3.0-or-later license.
Windows, Command line	Command line
Handles nonlinear conversions such as temperature and wire gauge Converts to and from sums of units like feet plus inches	Converts between SI and IEC storage units Handles byte addresses and LBA or CHS calculations
Command-line only, with no graphical interface Takes some learning to write complex expressions	Supports 64-bit operating systems only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.