About kWhmate
kWhmate is a small, independent site that turns official electricity tariffs into free calculators for households in Korea, Taiwan, the Philippines and Japan. It is operated by 토탈맥(TOTALMAC), a lighting and electrical installation company in Korea, so the LED and SMPS calculators come from day-to-day work with lighting jobs.
Editorial policy
- Official sources only. Tariffs come from the utility or government that sets them (KEPCO, Taipower, Meralco, TEPCO and Japan’s Ministry of Economy, Trade and Industry). Each calculator page shows the rate table it uses, the date the rates apply from and a link to the source.
- No invented numbers. We do not publish statistics we cannot source. Appliance wattages and household usage in examples are labelled as example inputs, and you can replace them with the value on your own label or bill.
- Checked by code. The worked examples on each page are computed from the same formula as the calculator when the site is built, and automated tests compare them with the calculator scripts, so a rate change cannot leave an old number in the text.
- Estimates, not bills. Discounts, contract types and billing-period details are listed on each page when they are not included. Your bill or utility is always the final amount.
When rates are updated
| Country | What changes | When we check |
|---|---|---|
| Korea | Fuel-cost adjustment, tariff revisions | Every quarter (announcements at the end of March, June, September and December) and whenever KEPCO revises the tariff |
| Taiwan | Residential tiered tariff | After each electricity price review (March and September) |
| Philippines | Meralco residential rate and distribution brackets | Every month, after Meralco’s announcement |
| Japan | TEPCO fuel-cost adjustment; renewable energy levy | Every month; the levy every fiscal year |
Contact and corrections
Found a wrong number or an outdated rate? Email [email protected] with the page address and, if you can, the official notice or your bill line. We check it against the official source and fix the calculator, the rate table and the examples together. Questions about advertising go to the same address (see Advertise).
Free to use, and how the site is funded
All calculators are free, with no sign-up. The exact numbers you type stay in your browser (see the privacy policy). The site may show ads and affiliate links, under these rules:
- Ads and affiliate links are always labelled (“Ad”, “제휴”, “廣告”, “広告”) and use rel="sponsored".
- Ads never change a tariff, a formula or a result, and are never made to look like a calculator button.
- Links to products sold by the operator’s own company are marked as such and are not affiliate links.
소개 (한국어)
kWhmate는 나라별 공식 전기요금표를 무료 계산기로 만드는 사이트입니다. 운영: 토탈맥(TOTALMAC)(조명·전기 공사 회사). 요금은 한전·台電·Meralco·東京電力 등 요금을 정하는 기관이 공개한 값만 쓰고, 계산기마다 요금표·적용 시점·출처를 함께 보여 줍니다. 페이지의 계산 예시는 빌드할 때 계산기와 같은 식으로 다시 계산해 넣으므로 요금이 바뀌면 함께 바뀝니다. 한국 연료비조정요금은 분기마다, 필리핀·일본은 매달 확인합니다.
틀린 숫자나 지난 요금을 발견하시면 페이지 주소와 함께 [email protected]로 알려 주세요. 공식 자료로 확인한 뒤 계산기·요금표·예시를 함께 고칩니다. 모든 계산기는 무료이며, 광고·제휴 링크에는 항상 ‘광고’·‘제휴’를 표시하고 계산 결과에는 영향을 주지 않습니다.
關於本站／運営者について
kWhmate 由韓國照明・電氣工程公司 토탈맥(TOTALMAC) 經營，台灣頁面使用台灣電力公司公告的住宅用電價，並在電價審議（3 月、9 月）後更新。發現錯誤請來信：[email protected]。
kWhmateは韓国の照明・電気工事会社 토탈맥(TOTALMAC) が運営しています。日本のページは東京電力エナジーパートナーの公表単価を使い、燃料費調整単価は毎月確認して更新します。誤りのご連絡：[email protected]。