Windows 11 Home Registry Size, Number of Keys, Values

Here's some basic questions about registry size for Windows 11 Home default installation with Office Home Edition.

This is an excellent backgrounder on Registry.

1. https://googleprojectzero.blogspot.com/2024/10/the-windows-registry-adventure-4-hives.html
2. Windows Registry Forensics Cheat Sheet 2025 - Cyber Triage
3. Metadata Consulting [dot] ca - Blog: Windows 10 Registry Size, Number of Keys, Values
4. RegToText - Registry to Text Utility

Here some stats on how large the registry is

DU v1.62 - Directory disk usage reporter
Copyright (C) 2005-2018 Mark Russinovich
Sysinternals - www.sysinternals.com

Totals:
Files:        160
Directories:  1
Size:         253,415,744 bytes
Size on disk: 253,748,904 bytes or  242.01 MB on disk

Raw Counts for Entire Registry Export file

File Name    Size    

---------    ----    

win11org.reg 515.71 MB - full exported file for Win11 Home

Number of Subkey paths in registry export file. Line starts with [

698591

Number of Default key/value pairs in registry export file. Line starts with @ (default) key

290280

Number of Named key/value pairs in registry export file. Line starts with " a named key

902551

Total Number of key/value pairs in registry export file. Line starts with @ (default) key or " a named key

1,192,831

There are 1,192,866 registry paths. 

Counts this included keys and values, can also be empty keys! 
There are 70,145 plain keys/paths, that have no key/value pairs under them.

Dureg Command

C:\Program Files (x86)\Resource Kit>dureg /a

Size of HKEY_CLASSES_ROOT   :   33,754,161
Size of HKEY_USERS          :   10,603,222
Size of HKEY_LOCAL_MACHINE  :   74,425,586

    Total Registry data size:    118,782,969   

You can get dureg here....

https://web.archive.org/web/20060415040835/http://download.microsoft.com/download/win2000platform/WebPacks/1.00.0.1/NT5/EN-US/Dureg.exe

Depth of keys 

Depth counts number of 'subdirectories' for a key. For example this key below, would have a depth of 7 (don't count top hive HKEY_LOCAL_MACHINE).  

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\VolumeCaches\Content Indexer Cleaner] 

Length  Number  Percentage
1	2	0.00%
2	14	0.00%
3	943	0.13%
4	7083	1.01%
5	55661	7.97%
6	181103	25.92%
7	121044	17.33%
8	83524	11.96%
9	56718	8.12%
10	84210	12.05%
11	25604	3.67%
12	31723	4.54%
13	30203	4.32%
14	8822	1.26%
15	3673	0.53%
16	4814	0.69%
17	1440	0.21%
18	946	0.14%
19	573	0.08%
20	209	0.03%
21	34	0.00%
22	67	0.01%
23	65	0.01%
24	42	0.01%
25	58	0.01%
26	8	0.00%
27	4	0.00%
28	4	0.00%
	698591	

Registry Types for Win11

Windows 11 Strange New Values in Registry? 

"SCO Support Level"=hex(200000):
"ManufacturerName"=hex(20004)
"WUDF"=hex(100000):   

Hex ID	Meaning	Use Case
hex(100000)	Reserved / Kernel Flag	Used by the Configuration Manager for hive-loading instructions.
hex(20001)	Indirect String	Reference to a .dll resource (Vista+).
hex(20004)	Expandable Indirect	Reference to a .dll resource with environment variables.

         The above where added in Windows Vista for 2000x, and 1000000 in Win11.

These are all the windows registry types that appear in .reg file are translated. 

"value" alias hex(1)	Default or blank	String value data with escape characters
hex alias hex(3)	REG_BINARY	Binary data (any arbitrary data, override interpolated by /e, if not found by Mozilla Universal Charset Detector library)
dword alias hex(4)	REG_DWORD	A 32-bit unsigned integer coded in little-endian format
hex(0)	REG_NONE	No type (the stored value, if any)
hex(1)	REG_SZ	A string value, normally stored and exposed in UTF-16LE (when using the Unicode version of Win32 API functions), usually terminated by a NUL character
hex(2)	EXPAND_SZ	An “expandable” string value that can contain environment variables, normally stored and exposed in UTF-16LE, usually terminated by a NUL character
hex(3)	REG_BINARY	Binary data (any arbitrary data, override interpolated by /e, if not found by Mozilla Universal Charset Detector library)
hex(4)	REG_DWORD_LITTLE_ENDIAN equivalent to REG_DWORD	A 32-bit unsigned integer coded in little-endian format
hex(5)	REG_DWORD_BIG_ENDIAN	A 32-bit unsigned integer coded in big-endian format
hex(6)	REG_LINK	A symbolic link (UNICODE) to another Registry key, specifying a root key and the path to the target key
hex(7)	REG_MULTI_SZ	A multi-string value, which is an ordered list of non-empty strings, normally stored and exposed in UTF-16LE, each one terminated by a NUL character, the list being normally terminated by a second NUL character.
hex(8)	REG_RESOURCE_LIST	A resource list, as specified https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/ns-wdm-_cm_resource_list
hex(9)	REG_FULL_RESOURCE_DESCRIPTOR	A resource descriptor, as specified https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/ns-wdm-_cm_full_resource_descriptor
hex(a)	REG_RESOURCE_REQUIREMENTS_LIST	A resource requirements list, as specified https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/wdm/ns-wdm-_io_resource_requirements_list
hex(b)	REG_QWORD_LITTLE_ENDIAN equivalent to REG_QWORD	A 64-bit integer little-endian (introduced in Windows XP)

To convert these values to text, get my tool at RegToText - Registry to Text Utility. Version 6 converts all above registry types, except new ones.