How much does sweet potato cost in Japan?

¥691 per kg, as of September 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 September 2026, Mito was cheapest at ¥358 and Tottori the most expensive at ¥949.

How much have sweet potato prices changed in Japan over the past year?

As of September 2026, -3.1% 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?

+6.1% compared with the same month five years earlier. The index now reads 119.3.

When were sweet potato prices in Japan at their highest?

The series peaked at 126.4 in July 2021. The latest reading is -5.6% 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).

Food · code 1411

Sweet potato price in Japan

さつまいも

Average retail price

¥691per kg-0.3% year on year

2026-09 · unweighted average of 81 surveyed cities

Cheapest surveyed city: ¥358 Mito
Priciest surveyed city: ¥949 Tottori

Price in your city:

¥658per kg-4.7% vs national average#14 cheapest of 52 cities

See all 52 cities, cheapest first

#	City	Price (JPY) · per kg
1	Mito	¥358
2	Utsunomiya	¥513
3	Nagano	¥515
4	Fukushima	¥540
5	Tsu	¥584
6	Kagoshima	¥597
7	Akita	¥604
8	Sagamihara	¥613
9	Aomori	¥616
10	Chiba	¥619
11	Oita	¥647
12	Fukuoka	¥648
13	Nagasaki	¥648
14	Tokyo (23 wards)	¥658
15	Saitama	¥658
16	Nara	¥667
17	Yokohama	¥670
18	Kumamoto	¥671
19	Toyama	¥675
20	Otsu	¥676
21	Sapporo	¥682
22	Niigata	¥682
23	Kofu	¥685
24	Kawasaki	¥685
25	Hamamatsu	¥691
26	Naha	¥695
27	Yamagata	¥698
28	Hiroshima	¥699
29	Tokushima	¥701
30	Nagoya	¥707
31	Matsuyama	¥709
32	Kitakyushu	¥727
33	Sendai	¥741
34	Kobe	¥751
35	Saga	¥761
36	Yamaguchi	¥762
37	Gifu	¥763
38	Takamatsu	¥766
39	Sakai	¥782
40	Wakayama	¥789
41	Morioka	¥791
42	Kochi	¥794
43	Kyoto	¥814
44	Okayama	¥821
45	Shizuoka	¥825
46	Osaka	¥825
47	Miyazaki	¥827
48	Fukui	¥851
49	Maebashi	¥881
50	Kanazawa	¥920
51	Matsue	¥922
52	Tottori	¥949

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 ¥691 per kg in Japan as of September 2026 — the unweighted average of 81 surveyed cities, down 0.3% from a year earlier. Measured as an index, the official CPI for sweet potato reads 119.3 (2020 = 100) in September 2026, down 3.1% year on year and up 6.1% over five years.

Sweet potato sits in the food group of Japan's CPI basket, with 681 monthly observations from January 1970 to September 2026. The series peaked at 126.4 in July 2021 and bottomed at 13.2 in November 1972; the latest reading is -5.6% against that peak. Against ten years ago it is +35.3%.

Latest CPI

119.3

2026-09 (2020=100)

YoY %

-3.1%

5y change %

+6.1%

Change since 1970-01

+734.3%

Annual average index by year

Annual average consumer price index for Sweet potato in Japan (2020 = 100)
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%	9

Average of the monthly index values in each year (2020 = 100). Blank months are excluded.

Average retail price by month

2026-09	¥691
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

Frequently asked questions

How much does sweet potato cost in Japan?: ¥691 per kg, as of September 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 September 2026, Mito was cheapest at ¥358 and Tottori the most expensive at ¥949.
How much have sweet potato prices changed in Japan over the past year?: As of September 2026, -3.1% 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?: +6.1% compared with the same month five years earlier. The index now reads 119.3.
When were sweet potato prices in Japan at their highest?: The series peaked at 126.4 in July 2021. The latest reading is -5.6% 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).