1	United States	120.5
2	Yemen	52.8
3	New Caledonia	42.5
4	Montenegro	39.1
4	Serbia	39.1
6	Canada	34.7
6	Uruguay	34.7
8	Cyprus	34.0
9	Finland	32.4
10	Lebanon	31.9
11	Iceland	31.7
12	Bosnia and Herzegovina	31.2
13	Austria	30.0
14	North Macedonia	29.8
15	Liechtenstein	28.8
15	Norway	28.8
17	Malta	28.3
18	Switzerland	27.6
19	New Zealand	26.3
20	Kosovo	23.8
21	Sweden	23.1
22	Greenland	22.3
22	Pakistan	22.3
24	Portugal	21.3
25	France	19.6
25	French Guiana	19.6
25	Germany	19.6
25	Iraq	19.6
25	Monaco	19.6
25	Reunion	19.6
31	Luxembourg	18.9
32	Bahamas	18.8
33	Jordan	18.7
34	Venezuela	18.5
35	Greece	17.6
36	Kuwait	16.7
36	Oman	16.7
36	Paraguay	16.7
36	Qatar	16.7
36	Saudi Arabia	16.7
36	United Arab Emirates	16.7
42	Virgin Islands	16.6
43	Turkiye	16.5
44	Suriname	15.9
45	Guyana	15.8
46	Slovenia	15.6
47	Namibia	15.4
48	Thailand	15.1
49	Australia	14.5
50	Italy	14.4
50	San Marino	14.4
52	Andorra	14.1
52	Honduras	14.1
54	Channel Islands	14.0
55	Croatia	13.7
56	Lithuania	13.6
57	Libya	13.3
58	Mexico	12.9
59	Bahrain	12.8
60	Belgium	12.7
61	Afghanistan	12.5
61	Czech Republic	12.5
61	Equatorial Guinea	12.5
64	Russian Federation	12.3
64	Somalia	12.3
66	Chile	12.1
66	Guatemala	12.1
68	Albania	12.0
68	El Salvador	12.0
70	Guam	11.5
70	Puerto Rico	11.5
72	Angola	11.2
73	Panama	10.8
74	Hungary	10.5
74	Latvia	10.5
76	Colombia	10.1
76	Georgia	10.1
76	Samoa	10.1
79	Belize	10.0
79	Costa Rica	10.0
81	Denmark	9.9
81	Faeroe Islands	9.9
81	Ukraine	9.9
84	South Africa	9.7
85	South Sudan	9.6
86	Cayman Islands	9.2
87	Jamaica	8.8
88	Guadeloupe	8.5
88	Martinique	8.5
88	St. Martin (French part)	8.5
91	Bulgaria	8.4
92	Brazil	8.3
92	Mauritius	8.3
94	Syrian Arab Republic	8.2
95	Ghana	8.0
95	Tonga	8.0
97	Mongolia	7.9
98	Spain	7.5
99	Argentina	7.4
99	Dominican Republic	7.4
101	Iran	7.3
102	Ireland	7.2
103	Israel	6.7
104	Sudan	6.6
105	Gambia	6.5
105	Slovakia	6.5
107	Dominica	6.2
107	Maldives	6.2
109	Armenia	6.1
109	Belarus	6.1
111	Cape Verde	5.7
112	Antigua and Barbuda	5.4
112	Montserrat	5.4
114	India	5.3
115	Nicaragua	5.2
116	Estonia	5.0
117	United Kingdom	4.9
118	Eswatini	4.8
118	Lesotho	4.8
118	Morocco	4.8
121	Bermuda	4.6
121	Grenada	4.6
123	Cambodia	4.5
123	Mozambique	4.5
125	Cote dIvoire	4.4
126	Sint Maarten (Dutch part)	4.2
127	Botswana	4.1
127	Egypt	4.1
127	Gibraltar	4.1
127	Seychelles	4.1
131	Vanuatu	3.9
132	Azerbaijan	3.6
132	China	3.6
132	Hong Kong, China	3.6
132	Macao, China	3.6
132	Philippines	3.6
137	Barbados	3.5
138	Gabon	3.4
138	Sao Tome and Principe	3.4
138	St. Kitts and Nevis	3.4
138	St. Lucia	3.4
138	St. Vincent and the Grenadines	3.4
143	Turks and Caicos Islands	3.3
144	Nigeria	3.2
144	Trinidad and Tobago	3.2
146	Djibouti	3.1
147	Laos	3.0
147	Moldova	3.0
149	Kazakhstan	2.8
149	Kyrgyzstan	2.8
149	Mauritania	2.8
149	Zimbabwe	2.8
153	Aruba	2.6
153	Curacao	2.6
153	Haiti	2.6
153	Netherlands	2.6
153	Northern Mariana Islands	2.6
153	Romania	2.6
159	French Polynesia	2.5
159	Poland	2.5
161	Ecuador	2.4
161	Republic of Congo	2.4
161	Sri Lanka	2.4
164	Algeria	2.1
164	Cameroon	2.1
164	Cuba	2.1
164	Liberia	2.1
168	Bolivia	2.0
168	Burundi	2.0
168	Peru	2.0
168	Senegal	2.0
172	Central African Republic	1.8
173	Myanmar (Burma)	1.6
173	Viet Nam	1.6
175	Comoros	1.5
175	Guinea-Bissau	1.5
175	Kenya	1.5
175	Nepal	1.5
179	Brunei Darussalam	1.4
180	Democratic Republic of Congo	1.2
180	Tuvalu	1.2
182	Mali	1.1
182	Palestinian Territory	1.1
182	Tunisia	1.1
185	Chad	1.0
185	Guinea	1.0
185	Papua New Guinea	1.0
188	Burkina Faso	0.9
188	Zambia	0.9
190	Bhutan	0.8
190	British Virgin Islands	0.8
190	Kiribati	0.8
190	Tanzania	0.8
190	Togo	0.8
190	Uganda	0.8
196	American Samoa	0.7
196	Madagascar	0.7
196	Malaysia	0.7
196	Micronesia, Federated States of	0.7
200	Fiji	0.5
200	Marshall Islands	0.5
200	Niger	0.5
200	Palau	0.5
200	Rwanda	0.5
200	Sierra Leone	0.5
206	Bangladesh	0.4
206	Eritrea	0.4
206	Ethiopia	0.4
206	Tajikistan	0.4
206	Turkmenistan	0.4
206	Uzbekistan	0.4
212	Benin	0.3
212	Japan	0.3
212	Malawi	0.3
212	North Korea	0.3
212	Singapore	0.3
212	Timor-Leste	0.3
218	Republic of Korea	0.2
218	Solomon Islands	0.2
220	Holy See (Vatican City)	0.0
220	Indonesia	0.0
220	Nauru	0.0
220	Taiwan	0.0

Original source
Aaron Karp, Estimating Global Civilian-held Firearms Numbers. Briefing Paper, Small Arms Survey, June 2018.