| Source | UN (World Population Prospects 2024) |
| Date | 23 May 2026 |
| Male Population | 25.73M |
| Female Population | 25.87M |
| Male (%) | 49.86% |
| Female (%) | 50.14% |
| Female Surplus | 146K |
| Total | 99.43 |
| At Birth | 106.00 |
| Age 0–14 | 105.10 |
| Age 15–64 | 105.89 |
| Age 65+ | 79.15 |
In 2026, South Korea is projected to have a nearly balanced sex ratio of 99.43 males per 100 females, indicating that females outnumber males by a small margin. Based on the overall female-to-male ratio, South Korea ranks 151st among 237 countries and territories worldwide, 24th among 51 entities in Asia, and seventh within East Asia. Its gender ratio is comparable to those of Dominica, Türkiye, and the Philippines.
There are 25,726,865 (25.73 million) males and 25,873,523 (25.87 million) females in South Korea, resulting in a female surplus of about 147K people. In percentage terms, females make up 50.14% of the population, compared to 49.86% for males. South Korea has the 20th-highest absolute female surplus in Asia and ranks 65th globally.
In South Korea, the male-to-female ratio fell from 104.36 males per 100 females in 1950 to below parity in 2019, when women began to outnumber men. This trend is expected to continue, with the ratio projected to decline further to about 89.10 males per 100 females by 2100.
The sex ratio at birth in South Korea is approximately 106.0 male births for every 100 female births. Historically, the ratio remained relatively stable from 1950 to 1989, then increased to 115.7 in 1990 before declining to 105.2 in 2016, illustrating shifts in birth sex ratios over time.
As of 2026, South Korea has more males than females in age groups under 55. The highest male-to-female ratio is found in the 30–34 age group, with 115.64 males per 100 females. Among children under 15, the sex ratio is 105.10, while in the working-age population (15–64), the ratio is moderately male-skewed at 105.89 males per 100 females. However, the ratio declines sharply among those aged 65 and older, with only 79.15 males for every 100 females. Among the elderly, women greatly outnumber men, with females outnumbering males by roughly 2 to 1 in the 85–89 age group and by about 18 to 1 among centenarians.
| Age group | Male | Female | M per 100 F | ||
|---|---|---|---|---|---|
| People | (%) | People | (%) | ||
| 00-04 | 635,278 | 51.30 | 603,105 | 48.70 | 105.335 |
| 05-09 | 818,472 | 51.25 | 778,681 | 48.75 | 105.110 |
| 10-14 | 1,142,171 | 51.21 | 1,088,176 | 48.79 | 104.962 |
| 15-19 | 1,205,370 | 51.48 | 1,136,089 | 48.52 | 106.098 |
| 20-24 | 1,344,765 | 51.94 | 1,244,313 | 48.06 | 108.073 |
| 25-29 | 1,752,250 | 52.33 | 1,596,531 | 47.67 | 109.754 |
| 30-34 | 1,965,051 | 53.63 | 1,699,289 | 46.37 | 115.640 |
| 35-39 | 1,753,722 | 52.88 | 1,562,905 | 47.12 | 112.209 |
| 40-44 | 1,897,659 | 51.75 | 1,768,961 | 48.25 | 107.275 |
| 45-49 | 2,008,271 | 51.03 | 1,927,543 | 48.97 | 104.188 |
| 50-54 | 2,112,897 | 50.60 | 2,062,726 | 49.40 | 102.432 |
| 55-59 | 2,184,638 | 49.90 | 2,193,613 | 50.10 | 99.591 |
| 60-64 | 2,020,054 | 49.78 | 2,038,251 | 50.22 | 99.107 |
| 65-69 | 1,874,646 | 48.40 | 1,998,626 | 51.60 | 93.797 |
| 70-74 | 1,275,951 | 46.90 | 1,444,420 | 53.10 | 88.337 |
| 75-79 | 835,452 | 44.92 | 1,024,362 | 55.08 | 81.558 |
| 80-84 | 529,063 | 40.23 | 786,090 | 59.77 | 67.303 |
| 85-89 | 275,754 | 33.03 | 559,159 | 66.97 | 49.316 |
| 90-94 | 82,873 | 23.51 | 269,594 | 76.49 | 30.740 |
| 95-99 | 11,844 | 13.09 | 78,663 | 86.91 | 15.057 |
| 100+ | 684 | 5.22 | 12,428 | 94.78 | 5.504 |
| Total | 25,726,865 | 49.86 | 25,873,525 | 50.14 | 99.433 |
| Year | Male | Female | Percentage (%) | M per 100 F | ||
|---|---|---|---|---|---|---|
| M | F | Birth | Total | |||
| 2024 | 25,814,137 | 25,903,453 | 49.91 | 50.09 | 105.9 | 99.655 |
| 2025 | 25,774,811 | 25,892,218 | 49.89 | 50.11 | 105.9 | 99.547 |
| 2026 | 25,726,865 | 25,873,523 | 49.86 | 50.14 | 106.0 | 99.433 |
| 2027 | 25,670,863 | 25,847,982 | 49.83 | 50.17 | 106.0 | 99.315 |
| 2028 | 25,607,300 | 25,816,130 | 49.80 | 50.20 | 106.0 | 99.191 |
| 2029 | 25,536,117 | 25,777,899 | 49.76 | 50.24 | 106.1 | 99.062 |
| 2030 | 25,456,248 | 25,732,336 | 49.73 | 50.27 | 106.1 | 98.927 |
| 2031 | 25,368,249 | 25,679,926 | 49.69 | 50.31 | 106.1 | 98.786 |
| 2032 | 25,271,391 | 25,619,898 | 49.66 | 50.34 | 106.1 | 98.640 |
| 2033 | 25,163,767 | 25,550,537 | 49.62 | 50.38 | 106.1 | 98.486 |
| 2034 | 25,045,109 | 25,471,699 | 49.58 | 50.42 | 106.1 | 98.325 |
| 2035 | 24,916,390 | 25,384,343 | 49.53 | 50.47 | 106.1 | 98.157 |
| 2036 | 24,777,949 | 25,288,594 | 49.49 | 50.51 | 106.1 | 97.981 |
| 2037 | 24,629,496 | 25,183,930 | 49.44 | 50.56 | 106.2 | 97.798 |
| 2038 | 24,470,931 | 25,070,226 | 49.40 | 50.60 | 106.2 | 97.610 |
| 2039 | 24,303,423 | 24,948,466 | 49.35 | 50.65 | 106.2 | 97.414 |
| 2040 | 24,128,614 | 24,820,072 | 49.29 | 50.71 | 106.2 | 97.214 |
| 2041 | 23,945,982 | 24,684,451 | 49.24 | 50.76 | 106.2 | 97.008 |
| 2042 | 23,756,994 | 24,542,750 | 49.19 | 50.81 | 106.2 | 96.798 |
| 2043 | 23,563,109 | 24,395,931 | 49.13 | 50.87 | 106.2 | 96.586 |
| 2044 | 23,361,951 | 24,241,415 | 49.08 | 50.92 | 106.2 | 96.372 |
| 2045 | 23,153,817 | 24,079,139 | 49.02 | 50.98 | 106.2 | 96.157 |
| 2046 | 22,940,522 | 23,910,376 | 48.96 | 51.04 | 106.2 | 95.944 |
| 2047 | 22,719,505 | 23,732,555 | 48.91 | 51.09 | 106.2 | 95.731 |
| 2048 | 22,489,513 | 23,544,281 | 48.85 | 51.15 | 106.2 | 95.520 |
| 2049 | 22,251,383 | 23,345,911 | 48.80 | 51.20 | 106.2 | 95.312 |
| 2050 | 22,005,605 | 23,137,529 | 48.75 | 51.25 | 106.2 | 95.108 |
| 2051 | 21,752,317 | 22,918,833 | 48.69 | 51.31 | 106.2 | 94.910 |
| 2052 | 21,490,326 | 22,688,515 | 48.64 | 51.36 | 106.2 | 94.719 |
| 2053 | 21,222,644 | 22,449,398 | 48.60 | 51.40 | 106.2 | 94.535 |
| 2054 | 20,952,765 | 22,204,687 | 48.55 | 51.45 | 106.2 | 94.362 |
| 2055 | 20,679,447 | 21,953,223 | 48.51 | 51.49 | 106.2 | 94.198 |
| 2056 | 20,401,327 | 21,693,770 | 48.46 | 51.54 | 106.2 | 94.042 |
| 2057 | 20,118,477 | 21,426,612 | 48.43 | 51.57 | 106.2 | 93.895 |
| 2058 | 19,831,679 | 21,152,863 | 48.39 | 51.61 | 106.2 | 93.754 |
| 2059 | 19,544,689 | 20,876,343 | 48.35 | 51.65 | 106.2 | 93.621 |
| 2060 | 19,258,713 | 20,598,515 | 48.32 | 51.68 | 106.2 | 93.496 |
| 2061 | 18,975,422 | 20,321,268 | 48.29 | 51.71 | 106.2 | 93.377 |
| 2062 | 18,694,504 | 20,044,540 | 48.26 | 51.74 | 106.2 | 93.265 |
| 2063 | 18,415,313 | 19,767,854 | 48.23 | 51.77 | 106.2 | 93.158 |
| 2064 | 18,139,686 | 19,493,137 | 48.20 | 51.80 | 106.2 | 93.057 |
| 2065 | 17,867,593 | 19,220,474 | 48.18 | 51.82 | 106.2 | 92.961 |
| 2066 | 17,599,644 | 18,950,668 | 48.15 | 51.85 | 106.2 | 92.871 |
| 2067 | 17,335,130 | 18,683,388 | 48.13 | 51.87 | 106.2 | 92.784 |
| 2068 | 17,074,376 | 18,419,044 | 48.11 | 51.89 | 106.2 | 92.700 |
| 2069 | 16,815,590 | 18,156,224 | 48.08 | 51.92 | 106.2 | 92.616 |
| 2070 | 16,558,229 | 17,894,758 | 48.06 | 51.94 | 106.2 | 92.531 |
| 2071 | 16,304,551 | 17,637,147 | 48.04 | 51.96 | 106.2 | 92.444 |
| 2072 | 16,054,595 | 17,383,540 | 48.01 | 51.99 | 106.2 | 92.355 |
| 2073 | 15,808,683 | 17,134,342 | 47.99 | 52.01 | 106.2 | 92.263 |
| 2074 | 15,566,225 | 16,889,257 | 47.96 | 52.04 | 106.2 | 92.166 |
| 2075 | 15,326,897 | 16,647,936 | 47.93 | 52.07 | 106.2 | 92.065 |
| 2076 | 15,090,665 | 16,410,523 | 47.91 | 52.09 | 106.2 | 91.957 |
| 2077 | 14,857,128 | 16,176,525 | 47.87 | 52.13 | 106.2 | 91.844 |
| 2078 | 14,626,736 | 15,946,215 | 47.84 | 52.16 | 106.2 | 91.725 |
| 2079 | 14,399,550 | 15,719,865 | 47.81 | 52.19 | 106.2 | 91.601 |
| 2080 | 14,174,901 | 15,496,607 | 47.77 | 52.23 | 106.2 | 91.471 |
| 2081 | 13,951,701 | 15,275,456 | 47.74 | 52.26 | 106.2 | 91.334 |
| 2082 | 13,730,869 | 15,057,478 | 47.70 | 52.30 | 106.2 | 91.190 |
| 2083 | 13,512,813 | 14,842,906 | 47.65 | 52.35 | 106.2 | 91.039 |
| 2084 | 13,297,263 | 14,631,338 | 47.61 | 52.39 | 106.2 | 90.882 |
| 2085 | 13,083,735 | 14,422,190 | 47.57 | 52.43 | 106.2 | 90.719 |
| 2086 | 12,871,767 | 14,214,801 | 47.52 | 52.48 | 106.2 | 90.552 |
| 2087 | 12,661,723 | 14,009,030 | 47.47 | 52.53 | 106.2 | 90.383 |
| 2088 | 12,454,063 | 13,804,860 | 47.43 | 52.57 | 106.2 | 90.215 |
| 2089 | 12,249,293 | 13,602,483 | 47.38 | 52.62 | 106.2 | 90.052 |
| 2090 | 12,047,453 | 13,401,641 | 47.34 | 52.66 | 106.2 | 89.895 |
| 2091 | 11,849,212 | 13,202,681 | 47.30 | 52.70 | 106.2 | 89.749 |
| 2092 | 11,655,011 | 13,005,809 | 47.26 | 52.74 | 106.2 | 89.614 |
| 2093 | 11,465,535 | 12,811,590 | 47.23 | 52.77 | 106.2 | 89.493 |
| 2094 | 11,281,486 | 12,620,588 | 47.20 | 52.80 | 106.2 | 89.390 |
| 2095 | 11,102,776 | 12,432,769 | 47.17 | 52.83 | 106.2 | 89.303 |
| 2096 | 10,930,118 | 12,248,974 | 47.16 | 52.84 | 106.2 | 89.233 |
| 2097 | 10,763,763 | 12,069,700 | 47.14 | 52.86 | 106.2 | 89.180 |
| 2098 | 10,602,446 | 11,894,034 | 47.13 | 52.87 | 106.2 | 89.141 |
| 2099 | 10,446,246 | 11,722,209 | 47.12 | 52.88 | 106.2 | 89.115 |
| 2100 | 10,294,718 | 11,554,074 | 47.12 | 52.88 | 106.2 | 89.100 |
| Year | Male | Female | Percentage (%) | M per 100 F | ||
|---|---|---|---|---|---|---|
| M | F | Birth | Total | |||
| 1950 | 10,089,463 | 9,667,859 | 51.07 | 48.93 | 106.2 | 104.361 |
| 1951 | 10,018,324 | 9,850,666 | 50.42 | 49.58 | 106.3 | 101.702 |
| 1952 | 10,144,220 | 10,085,659 | 50.14 | 49.86 | 106.3 | 100.581 |
| 1953 | 10,415,249 | 10,360,076 | 50.13 | 49.87 | 106.3 | 100.533 |
| 1954 | 10,751,397 | 10,664,176 | 50.20 | 49.80 | 106.3 | 100.818 |
| 1955 | 11,129,887 | 10,995,216 | 50.30 | 49.70 | 106.3 | 101.225 |
| 1956 | 11,516,740 | 11,357,694 | 50.35 | 49.65 | 106.3 | 101.400 |
| 1957 | 11,911,603 | 11,749,189 | 50.34 | 49.66 | 106.3 | 101.382 |
| 1958 | 12,319,762 | 12,154,165 | 50.34 | 49.66 | 106.2 | 101.362 |
| 1959 | 12,732,865 | 12,565,368 | 50.33 | 49.67 | 106.2 | 101.333 |
| 1960 | 13,142,885 | 12,972,495 | 50.33 | 49.67 | 106.2 | 101.313 |
| 1961 | 13,518,340 | 13,334,612 | 50.34 | 49.66 | 106.2 | 101.378 |
| 1962 | 13,859,317 | 13,649,921 | 50.38 | 49.62 | 106.2 | 101.534 |
| 1963 | 14,192,897 | 13,952,642 | 50.43 | 49.57 | 106.2 | 101.722 |
| 1964 | 14,508,782 | 14,236,194 | 50.47 | 49.53 | 106.2 | 101.915 |
| 1965 | 14,793,712 | 14,490,626 | 50.52 | 49.48 | 106.2 | 102.092 |
| 1966 | 15,079,543 | 14,766,397 | 50.52 | 49.48 | 106.2 | 102.121 |
| 1967 | 15,399,825 | 15,095,904 | 50.50 | 49.50 | 106.2 | 102.013 |
| 1968 | 15,734,718 | 15,440,572 | 50.47 | 49.53 | 106.2 | 101.905 |
| 1969 | 16,068,365 | 15,784,396 | 50.45 | 49.55 | 106.1 | 101.799 |
| 1970 | 16,408,688 | 16,133,509 | 50.42 | 49.58 | 106.1 | 101.706 |
| 1971 | 16,764,507 | 16,475,346 | 50.43 | 49.57 | 106.1 | 101.755 |
| 1972 | 17,132,133 | 16,804,333 | 50.48 | 49.52 | 106.1 | 101.951 |
| 1973 | 17,498,278 | 17,127,572 | 50.54 | 49.46 | 106.1 | 102.164 |
| 1974 | 17,854,607 | 17,433,230 | 50.60 | 49.40 | 106.1 | 102.417 |
| 1975 | 18,172,463 | 17,703,280 | 50.65 | 49.35 | 106.1 | 102.650 |
| 1976 | 18,431,423 | 17,948,502 | 50.66 | 49.34 | 106.1 | 102.691 |
| 1977 | 18,658,113 | 18,185,523 | 50.64 | 49.36 | 106.1 | 102.599 |
| 1978 | 18,872,127 | 18,409,807 | 50.62 | 49.38 | 106.1 | 102.511 |
| 1979 | 19,081,885 | 18,629,014 | 50.60 | 49.40 | 106.1 | 102.431 |
| 1980 | 19,294,155 | 18,846,952 | 50.59 | 49.41 | 106.1 | 102.373 |
| 1981 | 19,564,785 | 19,124,404 | 50.57 | 49.43 | 107.4 | 102.303 |
| 1982 | 19,894,327 | 19,461,827 | 50.55 | 49.45 | 107.3 | 102.222 |
| 1983 | 20,215,161 | 19,785,781 | 50.54 | 49.46 | 107.7 | 102.170 |
| 1984 | 20,514,881 | 20,083,419 | 50.53 | 49.47 | 108.7 | 102.148 |
| 1985 | 20,795,318 | 20,353,645 | 50.54 | 49.46 | 109.7 | 102.170 |
| 1986 | 21,096,896 | 20,621,608 | 50.57 | 49.43 | 111.2 | 102.305 |
| 1987 | 21,424,621 | 20,897,470 | 50.62 | 49.38 | 110.2 | 102.523 |
| 1988 | 21,753,730 | 21,169,248 | 50.68 | 49.32 | 112.7 | 102.761 |
| 1989 | 22,086,858 | 21,437,909 | 50.75 | 49.25 | 112.8 | 103.027 |
| 1990 | 22,397,804 | 21,683,623 | 50.81 | 49.19 | 115.7 | 103.294 |
| 1991 | 22,598,261 | 21,840,890 | 50.85 | 49.15 | 113.0 | 103.468 |
| 1992 | 22,718,936 | 21,934,758 | 50.88 | 49.12 | 113.8 | 103.575 |
| 1993 | 22,853,958 | 22,033,766 | 50.91 | 49.09 | 115.2 | 103.722 |
| 1994 | 22,996,873 | 22,133,967 | 50.96 | 49.04 | 115.0 | 103.899 |
| 1995 | 23,136,768 | 22,231,658 | 51.00 | 49.00 | 113.2 | 104.071 |
| 1996 | 23,285,924 | 22,352,776 | 51.02 | 48.98 | 111.5 | 104.175 |
| 1997 | 23,444,765 | 22,496,772 | 51.03 | 48.97 | 108.9 | 104.214 |
| 1998 | 23,597,630 | 22,633,247 | 51.04 | 48.96 | 110.0 | 104.261 |
| 1999 | 23,742,864 | 22,757,519 | 51.06 | 48.94 | 109.7 | 104.330 |
| 2000 | 23,887,084 | 22,879,577 | 51.08 | 48.92 | 110.0 | 104.404 |
| 2001 | 24,021,270 | 23,022,198 | 51.06 | 48.94 | 109.3 | 104.340 |
| 2002 | 24,130,655 | 23,168,466 | 51.02 | 48.98 | 109.7 | 104.153 |
| 2003 | 24,220,929 | 23,293,232 | 50.98 | 49.02 | 108.8 | 103.983 |
| 2004 | 24,295,854 | 23,401,222 | 50.94 | 49.06 | 108.2 | 103.823 |
| 2005 | 24,355,325 | 23,496,319 | 50.90 | 49.10 | 107.8 | 103.656 |
| 2006 | 24,416,622 | 23,589,895 | 50.86 | 49.14 | 107.4 | 103.505 |
| 2007 | 24,490,415 | 23,687,703 | 50.83 | 49.17 | 106.4 | 103.389 |
| 2008 | 24,568,989 | 23,787,503 | 50.81 | 49.19 | 106.3 | 103.285 |
| 2009 | 24,655,061 | 23,891,625 | 50.79 | 49.21 | 106.4 | 103.195 |
| 2010 | 24,755,452 | 24,013,880 | 50.76 | 49.24 | 106.6 | 103.088 |
| 2011 | 24,895,999 | 24,231,645 | 50.68 | 49.32 | 105.8 | 102.742 |
| 2012 | 25,068,874 | 24,530,706 | 50.54 | 49.46 | 105.7 | 102.194 |
| 2013 | 25,241,689 | 24,829,476 | 50.41 | 49.59 | 105.4 | 101.660 |
| 2014 | 25,412,647 | 25,126,408 | 50.28 | 49.72 | 105.3 | 101.139 |
| 2015 | 25,576,742 | 25,407,170 | 50.17 | 49.83 | 105.3 | 100.667 |
| 2016 | 25,698,156 | 25,599,683 | 50.10 | 49.90 | 105.2 | 100.385 |
| 2017 | 25,775,545 | 25,710,726 | 50.06 | 49.94 | 106.1 | 100.252 |
| 2018 | 25,836,216 | 25,804,678 | 50.03 | 49.97 | 105.5 | 100.122 |
| 2019 | 25,882,760 | 25,885,087 | 50.00 | 50.00 | 105.6 | 99.991 |
| 2020 | 25,903,431 | 25,955,050 | 49.95 | 50.05 | 105.7 | 99.801 |
| 2021 | 25,876,232 | 25,972,166 | 49.91 | 50.09 | 105.7 | 99.631 |
| 2022 | 25,840,655 | 25,941,857 | 49.90 | 50.10 | 105.8 | 99.610 |
| 2023 | 25,831,859 | 25,916,880 | 49.92 | 50.08 | 105.8 | 99.672 |