Top Engineering subreddits

Largest Engineering subreddits

Largest Engineering subreddits

#	Subreddit	Members	12-mo growth	Commenters / mo
1	r/AskEngineers	2.75M	+2.0%	2,303
2	r/EngineeringPorn	1.44M	+5.8%	2,490
3	E r/engineering	748,644	+5.2%	187
4	r/dataengineering	483,367	+19%	1,910
5	r/ElectricalEngineering	378,449	+21%	3,747
6	r/robotics	343,253	+14%	1,610
7	r/MechanicalEngineering	291,680	+29%	4,640
8	E r/ECE	249,700	+12%	1,089
9	r/civilengineering	233,333	+19%	5,258
10	r/Automate	157,977	+6.6%	101
11	r/StructuralEngineering	155,936	+23%	3,144
12	r/AerospaceEngineering	146,820	+20%	798
13	r/ChemicalEngineering	141,747	+15%	1,604
14	r/engineeringmemes	135,375	+8.7%	382
15	A r/aerospace	129,740	+16%	1,073
16	r/robots	68,109	+52%	1,287
17	C r/chipdesign	62,231	+51%	961
18	r/ControlTheory	58,354	+34%	303
19	r/dataengineeringjobs	44,957	+74%	716
20	r/ROS	42,840	+32%	252
21	I r/inventors	38,636	+58%	675
22	E r/EngineeringManagers	35,835	–	953
23	C r/CivilEngineers_PH	35,822	+43%	1,566
24	P r/PE_Exam	34,658	+25%	955
25	r/beneater	33,195	+35%	289

Fastest growing Engineering subreddits

Member growth over 12 months, among subreddits that had at least 18,251 members a year ago.

Fastest growing Engineering subreddits

#	Subreddit	12-mo growth	Members gained	Members	Commenters / mo
1	r/dataengineeringjobs	+74%	+19,116	44,957	716
2	I r/inventors	+58%	+14,119	38,636	675
3	r/robots	+52%	+23,316	68,109	1,287
4	C r/chipdesign	+51%	+20,884	62,231	961
5	C r/CivilEngineers_PH	+43%	+10,820	35,822	1,566
6	M r/MEPEngineering	+40%	+7,829	27,570	829
7	M r/mechatronics	+40%	+7,875	27,775	206
8	r/beneater	+35%	+8,539	33,195	289
9	r/ControlTheory	+34%	+14,843	58,354	303
10	r/ROS	+32%	+10,409	42,840	252
11	r/MechanicalEngineering	+29%	+64,789	291,680	4,640
12	P r/PE_Exam	+25%	+7,009	34,658	955
13	r/materials	+24%	+6,067	31,456	364
14	M r/MechanicalEngineer	+23%	+5,574	29,371	225
15	r/StructuralEngineering	+23%	+28,827	155,936	3,144
16	r/ElectricalEngineering	+21%	+64,566	378,449	3,747
17	r/Inventions	+21%	+4,098	24,040	181
18	r/AerospaceEngineering	+20%	+23,994	146,820	798
19	r/civilengineering	+19%	+37,842	233,333	5,258
20	r/dataengineering	+19%	+77,579	483,367	1,910
21	A r/aerospace	+16%	+17,938	129,740	1,073
22	r/ChemicalEngineering	+15%	+18,237	141,747	1,604
23	r/robotics	+14%	+41,298	343,253	1,610
24	E r/ECE	+12%	+27,591	249,700	1,089
25	r/engineeringmemes	+8.7%	+10,889	135,375	382

Most members gained

Engineering subreddits that gained the most members

#	Subreddit	Members gained	12-mo growth	Members	Commenters / mo
1	r/EngineeringPorn	+78,849	+5.8%	1.44M	2,490
2	r/dataengineering	+77,579	+19%	483,367	1,910
3	r/MechanicalEngineering	+64,789	+29%	291,680	4,640
4	r/ElectricalEngineering	+64,566	+21%	378,449	3,747
5	r/AskEngineers	+55,078	+2.0%	2.75M	2,303
6	r/robotics	+41,298	+14%	343,253	1,610
7	r/civilengineering	+37,842	+19%	233,333	5,258
8	E r/engineering	+36,787	+5.2%	748,644	187
9	r/StructuralEngineering	+28,827	+23%	155,936	3,144
10	E r/ECE	+27,591	+12%	249,700	1,089
11	r/AerospaceEngineering	+23,994	+20%	146,820	798
12	r/robots	+23,316	+52%	68,109	1,287
13	C r/chipdesign	+20,884	+51%	62,231	961
14	r/dataengineeringjobs	+19,116	+74%	44,957	716
15	r/ChemicalEngineering	+18,237	+15%	141,747	1,604
16	A r/aerospace	+17,938	+16%	129,740	1,073
17	r/ControlTheory	+14,843	+34%	58,354	303
18	I r/inventors	+14,119	+58%	38,636	675
19	r/engineeringmemes	+10,889	+8.7%	135,375	382
20	C r/CivilEngineers_PH	+10,820	+43%	35,822	1,566
21	r/ROS	+10,409	+32%	42,840	252
22	r/Automate	+9,739	+6.6%	157,977	101
23	r/beneater	+8,539	+35%	33,195	289
24	M r/mechatronics	+7,875	+40%	27,775	206
25	M r/MEPEngineering	+7,829	+40%	27,570	829

Most active Engineering subreddits

People who comment in a month, the average of the three months ending September 2026.

Most active Engineering subreddits

#	Subreddit	Commenters / mo	Posts / mo	Members
1	r/civilengineering	5,258	1,166	233,333
2	r/MechanicalEngineering	4,640	1,234	291,680
3	r/ElectricalEngineering	3,747	886	378,449
4	r/StructuralEngineering	3,144	414	155,936
5	r/EngineeringPorn	2,490	178	1.44M
6	r/AskEngineers	2,303	417	2.75M
7	r/dataengineering	1,910	814	483,367
8	r/robotics	1,610	826	343,253
9	r/ChemicalEngineering	1,604	437	141,747
10	C r/CivilEngineers_PH	1,566	620	35,822
11	r/dataengineersindia	1,340	608	24,206
12	r/robots	1,287	247	68,109
13	E r/ECE	1,089	657	249,700
14	A r/aerospace	1,073	268	129,740
15	C r/chipdesign	961	431	62,231
16	P r/PE_Exam	955	385	34,658
17	E r/EngineeringManagers	953	177	35,835
18	M r/MEPEngineering	829	218	27,570
19	V r/vlsi	820	406	15,771
20	r/AerospaceEngineering	798	212	146,820
21	r/dataengineeringjobs	716	311	44,957
22	I r/inventors	675	192	38,636
23	r/BuildingAutomation	571	173	18,767
24	r/AmazonRME	512	146	10,533
25	r/AskRobotics	466	354	18,339

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How these lists are made

• Members are the member counts measured in October 2026.
• Activity (commenters and posts per month) is the average of the three months ending September 2026. Posts by known bots are not counted.
• 12-month growth compares members now with members a year earlier. A subreddit is ranked by growth only if it already had at least 18,251 members a year ago (the median for subreddits with a known growth), so brand-new communities don't top the list from a base of zero. Subreddits with more monthly active users than 0.808 per member, a sign of inflated activity, are left out of the growth and activity lists.
• NSFW communities are excluded: those Reddit marks as 18+, those where most posts are NSFW, and the Adult Content topic.
• Topics follow Reddit's own community categories.
• The lists are rebuilt every month. Each list shows the top 25 (100 for the largest subreddits overall). Download all lists as CSV (free to reuse under CC BY 4.0, with a link to this page).