is if you require "hot partitioning" (resizing the system drive while Windows is running without rebooting). The calculator itself? Always free. Conclusion: Download Smarter, Partition Safer Don't fall into the trap of "eyeballing" partition sizes. That wasted 10GB here and 20GB there adds up to an entire operating system's worth of lost storage.
Guessing the wrong size leads to two nightmares: a C: drive that constantly flashes red warnings of low disk space, or a game drive where you waste 200GB of unused space that could have gone to a backup partition.
Bookmark a reliable today. Whether you choose a lightweight portable EXE or an open-source Linux tool, the key is consistency. Use the calculator every single time you create or resize a volume.
