As of 2025, the population of Japan is approximately 123.37 million people (123 366 734), making it the 12th most populous country in the dataset of 217 countries, with a 1.51% share of the combined total.
Over the past five years the population of Japan changed by -2.29%, and over the past ten years by -2.97%. By five-year growth, Japan ranks 198th of 217 countries; in terms of momentum, the decline is accelerating — from -0.14% to -0.46% per year.
| Year | Population | Diff | Diff % | Share of Universe |
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