City gas rates for homes in Seoul: the residential price per MJ, base charge and how your gas bill is calculated
Numbers checked against the official source on 2026-10-19
The residential gas tariff of Seoul City Gas is KRW 22.5268 per MJ for both cooking and heating, plus a base charge of KRW 1,250 per month per household, with 10% VAT added to the bill. The figure is unchanged between the table that took effect on 2026-10-01 and the one before it. The company's formula for a residential bill is: (usage x correction factor) x average heat value x unit price + base charge + replacement cost, plus 10% VAT. Your usage in cubic metres, the correction factor and the average heat value appear on your bill, so the estimator below asks you to type them in; none of those three values is stated on the tariff pages.
Read on 2026-10-19: Seoul City Gas tariff page (table column "2026.10.01", residential unchanged, 0.0%), Seoul City Gas "gas fee guide", Seoul's price-information page for the adjustment "from 2026. 9. 1. 00:00", and the Korea Gas Corporation wholesale table "(2026. 10. 1 기준 ... 부가세 별도)".
Residential tariff
| Use | Before | After | Change |
|---|---|---|---|
| Residential, cooking | 22.5268 | 22.5268 | 0.0% |
| Residential, heating | 22.5268 | 22.5268 | 0.0% |
| Heat-only equipment for apartment complexes (HOB) | 22.5268 | 22.5268 | 0.0% |
Seoul City Gas states the residential base charge as KRW 1,250 per month. Seoul's price-information page gives the same: "1,250원/월 ･가구" for residential users, with social welfare facilities billed at the industrial rate. The company's page also offers discounts for people it names as socially supported households, near-poverty households, basic living security recipients (housing benefit) and households with many children, with winter (December to March) and other-month rates; the amounts are on the company website.
What the unit price is made of
| Part | Amount |
|---|---|
| Wholesale price (KOGAS): raw material cost 17.712 + supply cost 3.1375 | 20.8495 |
| Retail (city gas company's supply cost) | 1.6773 |
| Consumer price (wholesale + retail) | 22.5268 |
Seoul City Gas explains the structure: the wholesale price (raw materials plus the Korea Gas Corporation's supply cost) is approved by the Minister of Trade, Industry and Energy and is adjusted automatically when the wholesale price changes under the pass-through system; the retail price adds the city gas company's supply cost, and a change to that part needs a review by the price committee and the local government head's approval. KOGAS says the wholesale price is the same nationwide, while the retail rate a consumer pays is decided by the city or provincial governor and differs by region.
Bill estimator
Type the three values from your gas bill. The estimator applies only the published formula: ((usage x correction factor) x average heat value) x 22.5268 + 1,250 + replacement cost, then plus 10% VAT. The default numbers in the boxes are arbitrary examples, not typical values. Social discounts and arrears are not included.
Other points on the company pages
- The "average heat value" is the monthly weighted average heat value (MJ/Nm3) of the billing period.
- A temperature and pressure correction factor is applied automatically on the bill for supply pressure of 250 mmAq or less (a city or provincial governor's notice under the City Gas Business Act, as quoted by the company).
- The company's tariff is posted with a list of effective dates going back many years, so you can check the rate in force for an earlier bill.
Where the sources differ
| Item | Seoul price-information page | Seoul City Gas table | What we show |
|---|---|---|---|
| Residential unit price | 22.5268 (adjusted from 2026-09-01, no change) | 22.5268 (table of 2026-10-01, no change) | Agree |
| Office heating ("업무난방용") | 29.0762 after the 2026-09-01 adjustment | "Before" 29.0762, "after" 29.8989 on 2026-10-01 | Not a residential rate; the two pages show two consecutive adjustments |
If you pay electricity too, see KEPCO residential rates; for waste and other monthly costs see garbage rules in Seoul. Other cities and Gyeonggi use other companies and rates. This page is not billing advice; confirm your bill with Seoul City Gas (customer service number 1588-5788 on its site).
Checked 2026-10-19.
Official sources
- Seoul City Gas — Gas rate table (가스요금표) — residential cooking and heating KRW/MJ, base charge KRW 1,250 per month; table of 2026.10.01 (checked 2026-10-19)
- Seoul City Gas — Gas fee guide (가스요금안내) — bill formula, 10% VAT, who approves wholesale and retail price changes, correction factor (checked 2026-10-19)
- Seoul Metropolitan Government price information — city gas (도시가스) — wholesale and retail split, adjustment effective 2026-09-01, base charge KRW 1,250 (checked 2026-10-19)
- Korea Gas Corporation — wholesale price of natural gas for city gas — residential wholesale KRW 20.8495/MJ as of 2026-10-01, VAT excluded; retail set by governors (checked 2026-10-19)
- Seoul City Gas — Bill calculation (요금계산) — same formula on the calculator page; average heat value defined (checked 2026-10-19)
Prices change. If an official page shows a different number from this page, the official page wins — and please tell us so we can fix it.