When you are going to purchase windows 10 online from website or CD the approx size of windows 10 is 4.50 GB before installation means the size of windows 10 setup file is 4.50 GB.

When you are going to install windows 10 setup on your desktop or laptop it takes 20 GB Space.

How many GB does Windows 10 take up?

Here’s what Microsoft says you need to run Windows 10: Processor: 1 gigahertz (GHz) or faster. RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit) Free hard disk space: 16 GB.

How big is the Windows 10 install?

Here are the system requirements for Windows 10 (and what your options are if your PC doesn’t meet them): Processor: 1 gigahertz (GHz) or faster processor or SoC. RAM: 1 gigabyte (GB) for a 32-bit version, or 2GB for 64-bit. Hard disk space: 16GB for a 32-bit OS; 20GB for 64-bit OS.