# List of aspect ratios of national flags

The following table shows the aspect ratio (height to width ratio) of national flags and subnational flags used by countries and dependencies. Variant flags such as ensigns are listed in the "Alternative flags" column if they have different proportions from the national flag. Territories without an official flag distinct from that of their controlling country are excluded.
The ratios most commonly used are 2:3, used by 88 of 195 sovereign states, such as Algeria and Pakistan, followed by 1:2, used by 55 sovereign states, such as Canada and Nigeria, followed by 3:5, used by 17 sovereign states, such as Germany and Bangladesh. Most dependencies and former colonies use the same proportions as their mother countries: all British Overseas Territories use 1:2 ratios, while the flags of most former and current Dutch and French areas have 2:3 proportions.
For comparison, the ratios are also given as a decimal number, which is the flag width divided by its height (e.g. a 2:3 flag has a decimal ratio of ⁠3/2⁠ = 1.5). Flags with irrational ratios have only a decimal approximation, and have the exact form given in the "Notes" column (which also includes additional information such as similar flags, recent flag changes, etc.).
| Aspect ratio | Number of sovereign countries |
| 11:28 | 1 (Qatar) |
| 1:2 | 55 (Abkhazia, Afghanistan (Islamic Emirate), Anguilla, Armenia, Australia, Azerbaijan, Bahamas, Belarus, Bermuda, Bosnia and Herzegovina, British Antarctic Territory, British Indian Ocean Territory, British Virgin Islands, Brunei, Canada, Cayman Islands, Christmas Island, Cocos (Keeling) Islands, Cook Islands, Croatia, Cuba, Dominica, Eritrea, Ethiopia, Falkland Islands, Fiji, Gibraltar, Guinea-Bissau, Honduras, Hungary, Ireland, Isle of Man, Jamaica, Jordan, Kazakhstan, Kiribati, North Korea, Kuwait, Latvia, Libya, Malaysia, Moldova, Mongolia, Montenegro, Montserrat, Nauru, New Caledonia, New Zealand, Nigeria, Niue, Norfolk Island, Northern Mariana Islands, North Macedonia, Palestine, Philippines, Pitcairn Islands, Sahrawi Arab Democratic Republic, Saint Lucia, Samoa, São Tomé and Príncipe, Seychelles, Slovenia, Solomon Islands, Somaliland, South Georgia and the South Sandwich Islands, South Ossetia, South Sudan, Sri Lanka, Sudan, Tajikistan, Timor-Leste, Tokelau, Tonga, Transnistria, Turks and Caicos Islands, Tuvalu, United Arab Emirates, United Kingdom, Uzbekistan, Zimbabwe) |
| 10:19 | 4 (American Samoa, Liberia, Marshall Islands, Micronesia, United States) |
| 22:41 | (Guam) |
| 11:20 | 1 (Paraguay) |
| 189:335 | 1 (El Salvador) |
| 4:7 | 3 (Iran, Mexico, Oman) |
| 10:17 | 1 (Cape Verde) |
| 3:5 | 17 (Bahrain, Bangladesh, Belize, Bulgaria, Burundi, Comoros, Costa Rica, Germany, Grenada, Guyana, Haiti, Jersey, Kyrgyzstan, Liechtenstein, Lithuania, Luxembourg, Nicaragua, Trinidad and Tobago) |
| 11:18 | 1 (Finland) |
| 1:φ | 1 (Togo) |
| 5:8 | 5 (Argentina, Guatemala, Palau, Poland, Sweden) |
| 7:11 | 1 (Estonia) |
| 16:25 | 1 (Cambodia) |
| 17:26 | (Åland) |
| 2:3 | 88 (Afghanistan (Islamic Republic), Algeria, Angola, Antigua and Barbuda, Aruba, Austria, Barbados, Benin, Bhutan, Bonaire, Botswana, Burkina Faso, Cameroon, Central African Republic, Chad, Chile, China, Colombia, Republic of the Congo, Curaçao, Cyprus, Czech Republic, Djibouti, Dominican Republic, Ecuador, Egypt, Equatorial Guinea, Eswatini, France, French Guiana, French Polynesia, French Southern and Antarctic Lands, Gambia, Georgia, Ghana, Greece, Greenland, Guadeloupe, Guernsey, Guinea, Hong Kong, India, Indonesia, Iraq, Iraqi Kurdistan, Italy, Côte d'Ivoire, Japan, Kenya, South Korea, Laos, Lebanon, Lesotho, Macau, Madagascar, Malawi, Maldives, Mali, Malta, Martinique, Mauritania, Mauritius, Morocco, Mozambique, Myanmar, Namibia, Netherlands, Northern Cyprus, Pakistan, Panama, Peru, Portugal, Puerto Rico, Romania, Russia, Rwanda, Saba, Saint Kitts and Nevis, Saint-Pierre and Miquelon, Saint Vincent and the Grenadines, Saudi Arabia, Senegal, Serbia, Sierra Leone, Singapore, Sint Eustatius, Sint Maarten, Slovakia, Somalia, South Africa, Spain, Suriname, Syria, Taiwan, Tanzania, Thailand, Tunisia, Turkey, Turkmenistan, Uganda, Ukraine, United States Virgin Islands, Uruguay, Vanuatu, Venezuela, Vietnam, Yemen, Zambia) |
| 15:22 | 1 (Bolivia) |
| 7:10 | 2 (Andorra, Brazil) |
| 5:7 | 2 (Albania, Kosovo) |
| 18:25 | 1 (Iceland) |
| 8:11 | 2 (Israel, Norway, Faroe Islands) |
| 3:4 | 4 (Democratic Republic of the Congo, Gabon, Papua New Guinea, San Marino) |
| 28:37 | 1 (Denmark) |
| 4:5 | 1 (Monaco) |
| 6:7 | 1 (Niger) |
| 13:15 | 1 (Belgium) |
| 1:1 | 2 (Switzerland, Vatican City) |
| ≈50:41 | 1 (Nepal) |
Legend:
* Bold: Sovereign states (UN member states and UN General Assembly non-member observer states)
* Bold italics: States with limited recognition
* Italics: Dependencies, constituent countries, and other non-sovereign territories
Click on the "Flag" header to sort by status: first sovereign states, then de facto countries, then dependencies.

## Main list

| Country or region | Ratio | Alternative flags | Sources and notes |
| Abkhazia | 1:2 (2) | | Another alternative government of that region has a more squarish unofficial flag. |
| Afghanistan (Islamic Emirate) | 1:2 (2) | | Currently disputed following the Fall of Kabul in 2021. |
| Afghanistan (Islamic Republic) | 2:3 (1.5) | | From 2001 until 2004, a 1:2 version of the flag was used. Currently disputed following the Fall of Kabul in 2021. |
| Åland (Finland) | 17:26 (1.529) | | Nordic cross |
| Albania | 5:7 (1.4) | Civil, state and naval ensigns: 2:3 | |
| Algeria | 2:3 (1.5) | | |
| American Samoa (US) | 10:19 (1.9) | | |
| Andorra | 7:10 (1.429) | | Compare to the flags of Chad, Moldova, and Romania |
| Angola | 2:3 (1.5) | | |
| Anguilla (UK) | 1:2 (2) | | The 1967–1969 Republic of Anguilla's "Dolphin Flag" has a ratio of 3:5. |
| Antigua and Barbuda | 2:3 (1.5) | | |
| Argentina | 5:8 (1.6) | Civil flag and ensign: 9:14 (without sun) | |
| Armenia | 1:2 (2) | | |
| Aruba (Kingdom of the Netherlands) | 2:3 (1.5) | | |
| Australia | 1:2 (2) | | Compare to the flag of New Zealand |
| Austria | 2:3 (1.5) | | |
| Azerbaijan | 1:2 (2) | | |
| Bahamas | 1:2 (2) | | |
| Bahrain | 3:5 (1.667) | | |
| Bangladesh | 3:5 (1.667) | Civil, naval and air force ensigns: 1:2 | |
| Barbados | 2:3 (1.5) | Naval ensign: 1:2 | |
| Belarus | 1:2 (2) | | |
| Belgium | 13:15 (1.154) | Civil and naval ensigns: both 2:3 | The 2:3 civil version is used more commonly on land, although the 13:15 version is official. |
| Belize | 3:5 (1.667) | | |
| Benin | 2:3 (1.5) | | Pan-African colours |
| Bermuda (UK) | 1:2 (2) | | |
| Bhutan | 2:3 (1.5) | | |
| Bolivia | 15:22 (1.467) | Civil ensign: 2:3 Qulla Suyu's banner: 1:1 | |
| Bonaire (Netherlands) | 2:3 (1.5) | | |
| Bosnia and Herzegovina | 1:2 (2) | | |
| Botswana | 2:3 (1.5) | | |
| Brazil | 7:10 (1.429) | Naval jack: 3:4 | |
| British Antarctic Territory (UK) | 1:2 (2) | | |
| British Indian Ocean Territory (UK) | 1:2 (2) | | |
| British Virgin Islands (UK) | 1:2 (2) | | |
| Brunei | 1:2 (2) | War flag: 2:3 | |
| Bulgaria | 3:5 (1.667) | Naval ensign and jack: 2:3 War flag: 1:1 | |
| Burkina Faso | 2:3 (1.5) | | Pan-African colours |
| Burundi | 3:5 (1.667) | | Until 1982, a 2:3 version of the flag was used. |
| Cambodia | 16:25 (1.563) | | |
| Cameroon | 2:3 (1.5) | | Pan-African colours. Compare to the flag of Senegal |
| Canada | 1:2 (2) | | |
| Cabo Verde | 10:17 (1.7) | 3:5 (1.667) 4:7 (1.75) 47:80 (1.702) 2:3 (1.5) | Constitution does not specify an official aspect ratio. Alternative ratios seen are listed. |
| Cayman Islands (UK) | 1:2 (2) | | |
| Central African Republic | 2:3 (1.5) | | Varying sources give 2:3 and 3:5 ratios. |
| Chad | 2:3 (1.5) | | Compare to the flag of Romania, in which the colours are a slightly lighter shade |
| Chile | 2:3 (1.5) | | The original version of the flag had an aspect ratio of ⁠1/2⁠φ$^2$tan(54°) ≈ 1.8017. |
| China | 2:3 (1.5) | | |
| Christmas Island (Australia) | 1:2 (2) | | |
| Cocos (Keeling) Islands (Australia) | 1:2 (2) | | |
| Colombia | 2:3 (1.5) | | Compare to the flag of Ecuador |
| Comoros | 3:5 (1.667) | | |
| Dem. Rep. of the Congo | 3:4 (1.333) | | All of the DRC's previous flags had 2:3 ratios. |
| Republic of the Congo | 2:3 (1.5) | | Pan-African colours |
| Cook Islands (New Zealand) | 1:2 (2) | | |
| Costa Rica | 3:5 (1.667) | | |
| Croatia | 1:2 (2) | Civil and state ensign, naval ensign and naval jack: all 2:3 | Pan-Slavic colours |
| Cuba | 1:2 (2) | Naval jack: 2:3 | The naval jack, a white and blue bicolour with a white star in a red canton, was briefly the national flag during the Ten Years' War, from 1868 until 1878. |
| Curaçao (Kingdom of the Netherlands) | 2:3 (1.5) | | |
| Cyprus | 2:3 (1.5) | | Until 2006, a slightly different design was used, which had an aspect ratio of 3:5. |
| Czech Republic | 2:3 (1.5) | | Pan-Slavic colours |
| Denmark | 28:37 (1.321) | State flag and ensign: 56:107; naval ensign: 7:17 (both swallowtails) | Nordic cross. Officially between 28:34 (1.214) and 28:37 (1.321), but the longer version is used more often. |
| Djibouti | 2:3 (1.5) | | |
| Dominica | 1:2 (2) | | |
| Dominican Republic | 2:3 (1.5) | | |
| Ecuador | 2:3 (1.5) | | Compare to the flag of Colombia |
| Egypt | 2:3 (1.5) | | Pan-Arab colours |
| El Salvador | 189:335 (1.772) | Civil flag (a plain tricolour): 3:5 Alternative state flag (with the text "Dios Union Libertad"): 3:5 or 18:29 | |
| Equatorial Guinea | 2:3 (1.5) | | |
| Eritrea | 1:2 (2) | | The first versions of the flag were 2:3, as well as the flag of the EPLF, on which the national flag is based. |
| Estonia | 7:11 (1.571) | Naval ensign: 7:13 (swallowtail) | |
| Eswatini | 2:3 (1.5) | | |
| Ethiopia | 1:2 (2) | | |
| Falkland Islands (UK) | 1:2 (2) | | |
| Faroe Islands (Denmark) | 8:11 (1.375) | | Nordic cross |
| Fiji | 1:2 (2) | | |
| Finland | 11:18 (1.636) | War flag/ensign: 11:19 (swallowtail) | Nordic cross |
| France | 2:3 (1.5) | | |
| French Guiana (France) | 2:3 (1.5) | | |
| French Polynesia (France) | 2:3 (1.5) | | |
| French Southern and Antarctic Lands (France) | 2:3 (1.5) | | |
| Gabon | 3:4 (1.333) | | |
| Gambia | 2:3 (1.5) | | |
| Georgia | 2:3 (1.5) | | The 1990–2004 flag had a 3:5 ratio. |
| Germany | 3:5 (1.667) | | The version used from 1919 to 1933 was 2:3. |
| Ghana | 2:3 (1.5) | | Pan-African colours |
| Gibraltar (UK) | 1:2 (2) | | |
| Greece | 2:3 (1.5) | | |
| Greenland (Denmark) | 2:3 (1.5) | | |
| Grenada | 3:5 (1.667) | Civil/state ensign and naval ensign: 1:2 | |
| Guadeloupe (France) | 2:3 (1.5) | | |
| Guam (US) | 22:41 (1.864) | | |
| Guatemala | 5:8 (1.6) | | |
| Guernsey (UK) | 2:3 (1.5) | Civil and state ensigns: 1:2 | |
| Guinea | 2:3 (1.5) | | Pan-African colours. Compare to the flag of Mali |
| Guinea-Bissau | 1:2 (2) | | Pan-African colours |
| Guyana | 3:5 (1.667) | National ensign: 1:2 Civil air ensign: 7:11 | |
| Haiti | 3:5 (1.667) | | |
| Honduras | 1:2 (2) | | |
| Hong Kong (China) | 2:3 (1.5) | | |
| Hungary | 1:2 (2) | Civil flag/ensign: 2:3 War flag and naval ensign: 3:4 | Compare to the flag of Tajikistan |
| Iceland | 18:25 (1.389) | State/war flag/ensign: 9:16 (swallowtail) | Nordic cross |
| India | 2:3 (1.5) | | |
| Indonesia | 2:3 (1.5) | | Compare with Flag of Monaco. |
| Iran | 4:7 (1.75) | | |
| Iraq | 2:3 (1.5) | | Compare to the flag of Yemen. Pan-Arab colours |
| Iraqi Kurdistan (Iraq) | 2:3 (1.5) | | Flag also occasionally used by Kurds in other countries |
| Ireland | 1:2 (2) | | Compare to the flag of Côte d'Ivoire |
| Isle of Man (UK) | 1:2 (2) | | |
| Israel | 8:11 (1.375) | Civil, naval and air force ensigns: 2:3 | |
| Italy | 2:3 (1.5) | War flag: 1:1 | |
| Côte d'Ivoire | 2:3 (1.5) | | Compare to the flag of Ireland |
| Jamaica | 1:2 (2) | | |
| Japan | 2:3 (1.5) | | |
| Jersey (UK) | 3:5 (1.667) | Civil and state ensigns: 1:2 | |
| Jordan | 1:2 (2) | | Compare to the flag of Palestine. Pan-Arab colours. |
| Kazakhstan | 1:2 (2) | | |
| Kenya | 2:3 (1.5) | Naval ensign: 1:2 | Pan-African colours |
| Kiribati | 1:2 (2) | | |
| North Korea | 1:2 (2) | War, naval and air force flags: 3:4 | The North and South Korean Unification Flag has 2:3 proportions. |
| South Korea | 2:3 (1.5) | | |
| Kosovo | 5:7 (1.4) | | |
| Kuwait | 1:2 (2) | | Pan-Arab colours |
| Kyrgyzstan | 3:5 (1.667) | | |
| Laos | 2:3 (1.5) | | |
| Latvia | 1:2 (2) | Naval ensign and jack: 2:3 | |
| Lebanon | 2:3 (1.5) | | |
| Lesotho | 2:3 (1.5) | | |
| Liberia | 10:19 (1.9) | | |
| Libya | 1:2 (2) | Naval ensign: 2:3 | The proportions were the same before 2011: 1:2 for the national flag (a solid green flag) and 2:3 for the naval ensign. Pan-Arab colours. |
| Liechtenstein | 3:5 (1.667) | | |
| Lithuania | 3:5 (1.667) | Naval ensign and jack: 1:2 | Officially specified in the Law on the National Flag and Other Flags. |
| Luxembourg | 3:5 (1.667) | Civil ensign: 5:7 | By law, both 1:2 and 3:5 ratios can be used, but 3:5 is more common. The civil ensign (a blue-and-white striped flag charged with a red lion) may be flown as a civil flag alongside the national flag, in which case it should have the same proportions as the tricolour. |
| Macau (China) | 2:3 (1.5) | | |
| Madagascar | 2:3 (1.5) | | |
| Malawi | 2:3 (1.5) | | Pan-African colours |
| Malaysia | 1:2 (2) | | |
| Maldives | 2:3 (1.5) | | |
| Mali | 2:3 (1.5) | | Pan-African colours. Compare to the flag of Guinea |
| Malta | 2:3 (1.5) | | |
| Marshall Islands | 10:19 (1.9) | | |
| Martinique (France) | 2:3 (1.5) | | Adopted 2023 and used alongside French national flag. Previously had several unofficial flags, some of which with a 2:3 ratio. From 2018 to 2019, the Ipséité flag used had a ratio of 8:11. |
| Mauritania | 2:3 (1.5) | | Pan-African colours |
| Mauritius | 2:3 (1.5) | Civil and state ensigns: 26:57 Naval ensign: 1:2 | |
| Mexico | 4:7 (1.75) | Naval Jack: 1:1 | |
| Micronesia | 10:19 (1.9) | | |
| Moldova | 1:2 (2) | War flag: 2:3 | Compare to the flag of Andorra |
| Monaco | 4:5 (1.25) | State flag: 2:3 | 4:5 are the official proportions, though the flag is commonly displayed with a 2:3 ratio. Compare with Flag of Indonesia. |
| Mongolia | 1:2 (2) | | |
| Montenegro | 1:2 (2) | Naval ensign: 2:5 | |
| Montserrat (UK) | 1:2 (2) | | |
| Morocco | 2:3 (1.5) | | |
| Mozambique | 2:3 (1.5) | | Pan-African colours |
| Myanmar | 2:3 (1.5) | Naval ensign: 5:9 | The pre-2010 national flag had the same 5:9 proportions as the current naval ensign. |
| Namibia | 2:3 (1.5) | | |
| Nauru | 1:2 (2) | | |
| Nepal | ≈50:41 (0.82) ≈5000000000:4101687939 (0.82) | | The only non-rectangular or non-square national flag. Also the only flag with a decimal ratio below 1 (i.e. taller than it is wide). While the red inner part has a ratio of exactly 4:3 (0.75), the complete flag has an irrational aspect ratio of approximately 1.21901:1 due to the blue border. |
| Netherlands | 2:3 (1.5) | | Compare to the flag of Luxembourg. Flag ratio not explicitly specified in law, but set by convention. |
| New Caledonia (France) | 1:2 (2) | | New Caledonia is one of the few regions with two official national flags: both the Kanak flag (shown) and the French tricolour (with 2:3 proportions) have official status. |
| New Zealand | 1:2 (2) | | Compare to the flag of Australia |
| Nicaragua | 3:5 (1.667) | | |
| Niger | 6:7 (1.167) | | The flag is sometimes displayed with other proportions than the unusual 6:7 ratio, even by the Nigerien government. The constitution does not give a specific aspect ratio, although the 6:7 version appears to be commonly displayed. A 2:3 variant is also seen. |
| Nigeria | 1:2 (2) | | |
| Niue (New Zealand) | 1:2 (2) | | |
| Norfolk Island (Australia) | 1:2 (2) | | |
| Northern Cyprus | 2:3 (1.5) | | |
| Northern Mariana Islands (US) | 1:2 (2) | | |
| North Macedonia | 1:2 (2) | | |
| Norway | 8:11 (1.375) | State/war flag/ensign: 16:27 (swallowtail) | Nordic cross |
| Oman | 4:7 (1.75) | Naval ensign: 2:3 | |
| Pakistan | 2:3 (1.5) | Naval ensign: 1:2 | |
| Palau | 5:8 (1.6) | | |
| Palestine | 1:2 (2) | | Compare to the flags of Jordan and Sudan. Pan-Arab colours |
| Panama | 2:3 (1.5) | | |
| Papua New Guinea | 3:4 (1.333) | | |
| Paraguay | 11:20 (1.818) | | |
| Peru | 2:3 (1.5) | Naval jack: 1:1 | |
| Philippines | 1:2 (2) | | Formerly was in 19:8 (2.375). |
| Pitcairn Islands (UK) | 1:2 (2) | | |
| Poland | 5:8 (1.6) | | Compare to the flags of Indonesia and Monaco, which have the colours positioned on the opposite side |
| Portugal | 2:3 (1.5) | Naval jack: 1:1 | |
| Puerto Rico (US) | 2:3 (1.5) | | Compare to the flag of Cuba, where the blue and red colours are swapped |
| Qatar | 11:28 (2.545) | | Qatar's flag is the only national flag having a width more than twice its height. |
| Romania | 2:3 (1.5) | Naval jack: 1:1 | Compare to the flag of Chad, in which the colours are a slightly darker shade |
| Russia | 2:3 (1.5) | | |
| Rwanda | 2:3 (1.5) | | |
| Saba (Netherlands) | 2:3 (1.5) | National ensign: 1:2 Civil air ensign: 7:11 | |
| Sahrawi Arab Dem. Rep. | 1:2 (2) | | Compare to the flag of Palestine, Jordan, and Sudan |
| Saint Kitts and Nevis | 2:3 (1.5) | Naval ensign: 1:2 | |
| Saint Lucia | 1:2 (2) | | |
| Saint-Pierre and Miquelon (France) | 2:3 (1.5) | | |
| Saint Vincent and the Grenadines | 2:3 (1.5) | | Several websites list 7:11 proportions. |
| Samoa | 1:2 (2) | | |
| San Marino | 3:4 (1.333) | | |
| São Tomé and Príncipe | 1:2 (2) | | |
| Saudi Arabia | 2:3 (1.5) | War flag: 5:7 (pennant) Naval ensign: 12:25 | |
| Senegal | 2:3 (1.5) | | Pan-African colours. Compare to the flag of Cameroon |
| Serbia | 2:3 (1.5) | | The former flag of Yugoslavia had a 1:2 ratio, as did the flag of Serbia and Montenegro. Pan-Slavic colours. |
| Seychelles | 1:2 (2) | | |
| Sierra Leone | 2:3 (1.5) | | |
| Singapore | 2:3 (1.5) | Civil, state and naval ensigns: 1:2 | |
| Sint Eustatius (Netherlands) | 2:3 (1.5) | | |
| Sint Maarten (Kingdom of the Netherlands) | 2:3 (1.5) | | |
| Slovakia | 2:3 (1.5) | | Pan-Slavic colours |
| Slovenia | 1:2 (2) | Civil ensign: 2:3 | Pan-Slavic colours |
| Solomon Islands | 1:2 (2) | | |
| Somalia | 2:3 (1.5) | | |
| Somaliland | 1:2 (2) | | |
| South Africa | 2:3 (1.5) | | |
| South Georgia and the South Sandwich Islands (UK) | 1:2 (2) | | |
| South Ossetia | 1:2 (2) | | |
| South Sudan | 1:2 (2) | | Pan-African colours |
| Spain | 2:3 (1.5) | Army flag: 1:1 | |
| Sri Lanka | 1:2 (2) | | |
| Sudan | 1:2 (2) | | Pan-Arab colours |
| Suriname | 2:3 (1.5) | | |
| Sweden | 5:8 (1.6) | War flag/ensign: 1:2 (swallowtail) | Nordic cross |
| Switzerland | 1:1 (1) | Civil/state ensign: 2:3 | One of two square national flags (the other being Vatican City, of which a 1:1 variant is one of a few that are acceptable). |
| Syria | 2:3 (1.5) | | The 1932–1958 and 1961–1963 flag, which is still used by some groups in the Syrian civil war, has 1:2 proportions. Pan-Arab colours. |
| Taiwan | 2:3 (1.5) | | |
| Tajikistan | 1:2 (2) | | Compare to the flag of Hungary |
| Tanzania | 2:3 (1.5) | | |
| Thailand | 2:3 (1.5) | | |
| Timor-Leste | 1:2 (2) | | |
| Togo | 1:φ (1.618) | | The sides of the flag are in the golden ratio φ = ⁠1+√5/2⁠ ≈ 1.618034, making the flag of Togo one of two national flags with irrational proportions (the other being that of Nepal). Pan-African colours. |
| Tokelau (New Zealand) | 1:2 (2) | | |
| Tonga | 1:2 (2) | | |
| Transnistria | 1:2 (2) | | The civil flag (without the hammer and sickle and star) is also sometimes used with a 2:3 ratio. |
| Trinidad and Tobago | 3:5 (1.667) | Civil/state and naval ensigns: 1:2 | |
| Tunisia | 2:3 (1.5) | | |
| Turkey | 2:3 (1.5) | | |
| Turkmenistan | 2:3 (1.5) | | |
| Turks and Caicos Islands (UK) | 1:2 (2) | | |
| Tuvalu | 1:2 (2) | | |
| Uganda | 2:3 (1.5) | | |
| Ukraine | 2:3 (1.5) | Naval ensign 2:3 | |
| United Arab Emirates | 1:2 (2) | | Pan-Arab colours. |
| United Kingdom | 1:2 (2) | | |
| United States | 10:19 (1.9) | | Law does not specify flag proportions. They were detailed in executive order 10834 in 1959. |
| United States Virgin Islands (US) | 2:3 (1.5) | | |
| Uruguay | 2:3 (1.5) | | |
| Uzbekistan | 1:2 (2) | | |
| Vanuatu | 2:3 (1.5) | | State Flag and Armorial Bearings Public Declaration (March 19,1980) shows an image with a 2:3 ratio. This takes precedence over unofficial sources that claim the ratio is 19:36, 11:18, or 3:5. |
| Vatican City | 1:1 (1) * | | * Explicitly undefined, although 1:1 is considered an acceptable ratio. If 1:1 ratio assumed, one of two square national flags (the other being Switzerland). Variants of ratios between 1:1 and 1:2 (2) have been seen as well. |
| Venezuela | 2:3 (1.5) | | |
| Vietnam | 2:3 (1.5) | | |
| Yemen | 2:3 (1.5) | | Compare to the flag of Iraq. Pan-Arab colours. |
| Zambia | 2:3 (1.5) | | |
| Zimbabwe | 1:2 (2) | | Pan-African colours |
* Nine of the thirteen overseas regions and territories of France (the other four being French Polynesia, Martinique, New Caledonia and the French Southern and Antarctic Lands) do not have official flags other than the French tricolour. A flag for the department of French Guiana has been officially adopted, though this flag has not been approved by the regional council. Most of the other territories however have unofficial flags, and some of these flags are used locally. See Flags of the regions of France.
* Akrotiri and Dhekelia, Sovereign Base Areas of the United Kingdom, do not have an official flag other than the Union Jack. A reported green flag defaced with two golden lions is actually the flag of the Dhekelia Garrison, and is not an official flag of the entire territory.
* The British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha has no separate flag and uses the Union Jack. The three constituent parts have their own flags, which all follow the "blue ensign with territorial arms" pattern of most other BOTs. See Flag of Saint Helena, Flag of Ascension Island and Flag of Tristan da Cunha.
* The nine United States Minor Outlying Islands do not have official flags, though there are unofficial local flags for five of the islands and island groups (Johnston Atoll, the Midway Islands, Palmyra Atoll, Wake Island and Navassa Island).
* None of the Norwegian overseas territories have flags.
* Antarctica has no government and as such cannot officially adopt a flag, though there are a few proposed flags used to represent the continent.