Sweet potato
Average retail price
- Cheapest surveyed city
- ¥386 Utsunomiya
- Priciest surveyed city
- ¥951 Tottori
Retail price survey conducted by the Statistics Bureau of Japan. This is a survey average, not a shop price — actual prices vary by store. 総務省統計局 小売物価統計調査 · Surveyed items and specifications
Key facts
Sweet potato costs ¥702 per kg in Japan as of August 2026 — the unweighted average of 81 surveyed cities, down 2.2% from a year earlier. Measured as an index, the official CPI for sweet potato reads 122.9 (2020 = 100) in August 2026, down 2.8% year on year and up 3.0% over five years.
Sweet potato sits in the food group of Japan's CPI basket, with 680 monthly observations from January 1970 to August 2026. The series peaked at 126.4 in July 2021 and bottomed at 13.2 in November 1972; the latest reading is -2.8% against that peak. Against ten years ago it is +24.3%.
Annual average index by year
| Year | Index | YoY % | Months |
|---|---|---|---|
| 2015 | 90.4 | +16.0% | 12 |
| 2016 | 89.9 | -0.6% | 12 |
| 2017 | 84.4 | -6.1% | 12 |
| 2018 | 87.4 | +3.6% | 12 |
| 2019 | 94.0 | +7.6% | 12 |
| 2020 | 102.0 | +8.5% | 12 |
| 2021 | 110.2 | +8.0% | 12 |
| 2022 | 112.6 | +2.2% | 12 |
| 2023 | 110.5 | -1.9% | 12 |
| 2024 | 111.1 | +0.5% | 12 |
| 2025 | 118.5 | +6.7% | 12 |
| 2026 | 118.9 | +0.3% | 8 |
Average of the monthly index values in each year (2020 = 100). Blank months are excluded.
Average retail price by month
| 2026-08 | ¥702 |
|---|---|
| 2026-07 | ¥711 |
| 2026-06 | ¥699 |
| 2026-05 | ¥672 |
| 2026-04 | ¥651 |
| 2026-03 | ¥652 |
| 2026-02 | ¥648 |
| 2026-01 | ¥673 |
| 2025-12 | ¥674 |
| 2025-11 | ¥669 |
| 2025-10 | ¥669 |
| 2025-09 | ¥693 |
| 2025-08 | ¥718 |
Frequently asked questions
- How much does sweet potato cost in Japan?
- ¥702 per kg, as of August 2026 — the unweighted average of 81 surveyed cities in the government's retail price survey.
- Which Japanese city has the cheapest sweet potato?
- Among the surveyed cities in August 2026, Utsunomiya was cheapest at ¥386 and Tottori the most expensive at ¥951.
- How much have sweet potato prices changed in Japan over the past year?
- As of August 2026, -2.8% year on year, measured by Japan's official consumer price index (2020 = 100).
- How much have sweet potato prices changed in Japan over the past five years?
- +3.0% compared with the same month five years earlier. The index now reads 122.9.
- When were sweet potato prices in Japan at their highest?
- The series peaked at 126.4 in July 2021. The latest reading is -2.8% against that peak.
- What is the difference between the index and the yen price?
- This page carries two kinds of number. The index (2020 = 100) measures percentage change over time and is not a yen amount; the yen figure is an actual average retail price from the government's retail price survey. Source: 総務省統計局 消費者物価指数 (e-Stat table 0003427113, nationwide, monthly).