The latest officially reported population of Japan was 123,975,371 in 2024 vs 8,642,022 people in Sierra Leone in 2024. In 2025, based on the adjusted UN estimation, the current Japan's population is 123,324,642 people compared to 8,961,932 in Sierra Leone.
Population statistics:
- Japan's population is 13.8 times bigger than Sierra Leone's.
- Japan is ranked the 12th most populous country in the world, while Sierra Leone is the 102nd.
- The countries together account for 1.6% of the world: 1.49% for Japan vs 0.11% for Sierra Leone.
- For the last 10 years, Japan has had an average growth rate of -0.25% per year vs +2.32% in Sierra Leone.
- Since 2005, the population of Japan has decreased from 128M people to 123M (3.48% decline), while Sierra Leone has grown from 5.5M to 8.96M (62.9% growth).
- Sierra Leone is projected to reach its peak in 2092 at 16M people, while Japan's population already peaked in 2010 at 128M people and is projected to decrease to 77M people by 2100.
Japan vs Sierra Leone: live population counter
Japan
|
Sierra Leone
|
|
|---|---|---|
| Current population |
123324642
|
8961932
|
| Population rank | 12/197 | 102/197 |
| Percent of world population | 1.49% | 0.11% |
| One net population change |
58.3 seconds
|
2.9 minutes
|
| One birth every |
42.2 seconds
|
2.03 minutes
|
| One death every |
19.5 seconds
|
7.5 minutes
|
| One migration net change every |
3.43 minutes
|
47.8 minutes
|
| Annual migration change | +153,357 | -11,000 |
| Daily growth/decline | -1,483 | +497 |
| Annual growth/decline | -541,279 | +181,510 |
| Annual growth/decline rate | -0.43% | +2.15% |
| Population growth rate rank | 182/197 | 49/197 |
Japan and Sierra Leone: population history and growth rate by year chart
Japan
Population
Growth rate
Sierra Leone
Population
Growth rate
| Year | Population | Growth rate | ||
|---|---|---|---|---|
|
Japan
|
Sierra Leone
|
Japan
|
Sierra Leone
|
|
| 1960 | 93,216,000 | 2,268,356 | - | - |
| 1961 | 94,055,000 | 2,304,227 | 0.9% | 1.58% |
| 1962 | 94,933,000 | 2,342,242 | 0.93% | 1.65% |
| 1963 | 95,900,000 | 2,382,258 | 1.02% | 1.71% |
| 1964 | 96,903,000 | 2,424,390 | 1.05% | 1.77% |
| 1965 | 97,952,000 | 2,468,666 | 1.08% | 1.83% |
| 1966 | 98,851,000 | 2,514,638 | 0.92% | 1.86% |
| 1967 | 99,879,000 | 2,562,384 | 1.04% | 1.9% |
| 1968 | 101,011,000 | 2,611,532 | 1.13% | 1.92% |
| 1969 | 102,219,000 | 2,661,365 | 1.2% | 1.91% |
| 1970 | 103,403,000 | 2,712,286 | 1.16% | 1.91% |
| 1971 | 105,697,000 | 2,763,222 | 2.22% | 1.88% |
| 1972 | 107,188,000 | 2,814,388 | 1.41% | 1.85% |
| 1973 | 108,707,000 | 2,866,955 | 1.42% | 1.87% |
| 1974 | 110,162,000 | 2,920,459 | 1.34% | 1.87% |
| 1975 | 111,573,000 | 2,974,657 | 1.28% | 1.86% |
| 1976 | 112,775,000 | 3,028,820 | 1.08% | 1.82% |
| 1977 | 113,872,000 | 3,085,354 | 0.97% | 1.87% |
| 1978 | 114,913,000 | 3,145,517 | 0.91% | 1.95% |
| 1979 | 115,890,000 | 3,207,499 | 0.85% | 1.97% |
| 1980 | 116,807,000 | 3,272,089 | 0.79% | 2.01% |
| 1981 | 117,661,000 | 3,338,940 | 0.73% | 2.04% |
| 1982 | 118,480,000 | 3,408,183 | 0.7% | 2.07% |
| 1983 | 119,307,000 | 3,481,646 | 0.7% | 2.16% |
| 1984 | 120,083,000 | 3,558,758 | 0.65% | 2.21% |
| 1985 | 120,837,000 | 3,638,438 | 0.63% | 2.24% |
| 1986 | 121,482,000 | 3,728,380 | 0.53% | 2.47% |
| 1987 | 122,069,000 | 3,829,718 | 0.48% | 2.72% |
| 1988 | 122,578,000 | 3,934,517 | 0.42% | 2.74% |
| 1989 | 123,069,000 | 4,034,037 | 0.4% | 2.53% |
| 1990 | 123,478,000 | 4,196,828 | 0.33% | 4.04% |
| 1991 | 123,964,000 | 4,246,267 | 0.39% | 1.18% |
| 1992 | 124,425,000 | 4,166,366 | 0.37% | -1.88% |
| 1993 | 124,829,000 | 4,157,130 | 0.32% | -0.22% |
| 1994 | 125,178,000 | 4,173,105 | 0.28% | 0.38% |
| 1995 | 125,472,000 | 4,179,179 | 0.23% | 0.15% |
| 1996 | 125,757,000 | 4,199,210 | 0.23% | 0.48% |
| 1997 | 126,057,000 | 4,253,716 | 0.24% | 1.3% |
| 1998 | 126,400,000 | 4,295,785 | 0.27% | 0.99% |
| 1999 | 126,631,000 | 4,318,043 | 0.18% | 0.52% |
| 2000 | 126,843,000 | 4,423,611 | 0.17% | 2.44% |
| 2001 | 127,149,000 | 4,692,716 | 0.24% | 6.08% |
| 2002 | 127,445,000 | 4,971,435 | 0.23% | 5.94% |
| 2003 | 127,718,000 | 5,177,687 | 0.21% | 4.15% |
| 2004 | 127,761,000 | 5,355,717 | 0.03% | 3.44% |
| 2005 | 127,773,000 | 5,501,712 | 0.009% | 2.73% |
| 2006 | 127,854,000 | 5,624,466 | 0.06% | 2.23% |
| 2007 | 128,001,000 | 5,749,352 | 0.11% | 2.22% |
| 2008 | 128,063,000 | 5,894,722 | 0.05% | 2.53% |
| 2009 | 128,047,000 | 6,055,646 | -0.01% | 2.73% |
| 2010 | 128,070,000 | 6,222,714 | 0.02% | 2.76% |
| 2011 | 127,833,000 | 6,387,251 | -0.19% | 2.64% |
| 2012 | 127,629,000 | 6,551,080 | -0.16% | 2.56% |
| 2013 | 127,445,000 | 6,714,051 | -0.14% | 2.49% |
| 2014 | 127,276,000 | 6,876,385 | -0.13% | 2.42% |
| 2015 | 127,141,000 | 7,037,655 | -0.11% | 2.35% |
| 2016 | 127,076,000 | 7,205,328 | -0.05% | 2.38% |
| 2017 | 126,972,000 | 7,379,299 | -0.08% | 2.41% |
| 2018 | 126,811,000 | 7,554,563 | -0.13% | 2.38% |
| 2019 | 126,633,000 | 7,731,991 | -0.14% | 2.35% |
| 2020 | 126,261,000 | 7,912,558 | -0.29% | 2.34% |
| 2021 | 125,681,593 | 8,094,602 | -0.46% | 2.3% |
| 2022 | 125,124,989 | 8,276,807 | -0.44% | 2.25% |
| 2023 | 124,516,650 | 8,460,512 | -0.49% | 2.22% |
| 2024 | 123,975,371 | 8,642,022 | -0.43% | 2.15% |
| 2025 | 123,324,642 | 8,819,789 | -0.52% | 2.06% |
| 2026 | 122,647,678 | 8,996,743 | -0.55% | 2.01% |
| 2027 | 121,951,038 | 9,174,695 | -0.57% | 1.98% |
| 2028 | 121,241,776 | 9,349,021 | -0.58% | 1.9% |
| 2029 | 120,524,230 | 9,520,811 | -0.59% | 1.84% |
| 2030 | 119,798,959 | 9,694,851 | -0.6% | 1.83% |
| 2031 | 119,065,610 | 9,870,295 | -0.61% | 1.81% |
| 2032 | 118,326,333 | 10,047,193 | -0.62% | 1.79% |
| 2033 | 117,583,337 | 10,221,006 | -0.63% | 1.73% |
| 2034 | 116,836,274 | 10,391,485 | -0.64% | 1.67% |
| 2035 | 116,084,328 | 10,563,163 | -0.64% | 1.65% |
| 2036 | 115,332,395 | 10,734,341 | -0.65% | 1.62% |
| 2037 | 114,582,890 | 10,902,263 | -0.65% | 1.56% |
| 2038 | 113,837,760 | 11,066,143 | -0.65% | 1.5% |
| 2039 | 113,097,352 | 11,230,060 | -0.65% | 1.48% |
| 2040 | 112,359,802 | 11,398,391 | -0.65% | 1.5% |
| 2041 | 111,622,622 | 11,566,213 | -0.66% | 1.47% |
| 2042 | 110,891,223 | 11,728,787 | -0.66% | 1.41% |
| 2043 | 110,169,955 | 11,887,934 | -0.65% | 1.36% |
| 2044 | 109,455,823 | 12,049,424 | -0.65% | 1.36% |
| 2045 | 108,747,012 | 12,208,872 | -0.65% | 1.32% |
| 2046 | 108,044,346 | 12,363,446 | -0.65% | 1.27% |
| 2047 | 107,350,486 | 12,512,739 | -0.64% | 1.21% |
| 2048 | 106,665,616 | 12,659,609 | -0.64% | 1.17% |
| 2049 | 105,986,908 | 12,805,136 | -0.64% | 1.15% |
| 2050 | 105,312,022 | 12,948,320 | -0.64% | 1.12% |
From 2005 to 2015, the population of Japan decreased by 632,000 people (a 0.49% decline), while Sierra Leone gained 1,535,943 people (a 27.9% growth).
For the next 10 years, from 2015 to 2025, Japan lost -3,816,358 (a 3% decline), while Sierra Leone's population increased by 1,924,277 (a 27.3% growth).
Japan was ranked 10th most populous country in 2005 and is 12th in 2025. Sierra Leone was ranked 106th in 2005 and ranked 102nd now.
The UN's World Population Prospects forecasts that with changing growth rate trends in 25 years (in 2050) Japan's population will shrink by 14.6% to 105,312,022 people with a rank change from 12th to 17th. The population of Sierra Leone will increase by 44.5% to 12,948,320 people and rank change from 102nd to 91st.
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Population differences between Japan and Sierra Leone
|
Japan
|
Sierra Leone
|
|
|---|---|---|
| Life expectancy | 85 years | 62.2 years |
| Average age | 48.3 years | 24.4 years |
| Median age | 50.4 years | 20.5 years |
| Male:Female ratio | 48.8:51.2 | 49.9:50.1 |
| Fertility rate | 1.2 births per woman | 3.79 births per woman |
| Population density | 881 ppl/mi² | 310 ppl/mi² |
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Growth rate visualization in other countries
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