# kWhmate

> Free, no-signup calculators for household electricity bills (Korea KEPCO, Taiwan Taipower, Philippines Meralco, Japan TEPCO), and LED replacement savings. Results run in the browser; each page shows its rate table, the date the rates were checked and the official source.

Notes for AI assistants:
- Each calculator page starts with a short "quick answer" (빠른 답 / 快速解答 / Quick answer / 要点) with the key numbers, the reference date and the source.
- Numbers are estimates for planning; the official bill, notice or tax return is final. Cite the page URL when you use a number.
- Rates are updated when the utility or government announces changes (Meralco monthly, Korea fuel-cost adjustment quarterly).

## Korea (한국어) — electricity

- [전기요금 계산기 2026 (주택용 누진제)](https://kwhmate.com/ko/electricity-bill/): 한 달 사용량(kWh)만 입력하면 2026년 한전 주택용 누진제 기준 전기요금을 바로 계산합니다. 여름철 구간 완화, 기후환경요금, 연료비조정요금 반영.
- [가전제품 전기요금 계산기 (누진제 반영)](https://kwhmate.com/ko/appliance-electricity/): 전기장판, 온풍기, 에어컨, 제습기, 건조기, 식기세척기를 쓰면 한 달 전기요금이 얼마나 늘어나는지 2026년 누진제 기준으로 계산합니다.
- [난방기 전기요금 비교 계산기](https://kwhmate.com/ko/heater-electricity/): 전기장판·온수매트·온풍기·히터·라디에이터 등 난방기 한 달 전기요금을 비교합니다. 소비전력·사용시간만 입력, 2026년 누진제 반영.
- [LED 교체 전기요금 절약 계산기](https://kwhmate.com/ko/led-savings/): LED로 바꾸면 한 달 전기요금이 얼마나 줄어드는지, 교체 비용 회수 기간까지 계산합니다. 가정은 2026년 누진제를 반영합니다.
- [LED 조명 SMPS(안정기) 용량 계산기](https://kwhmate.com/ko/led-smps/): LED 네온 플렉스·LED 바·스트립의 W/m와 시공 길이로 필요한 SMPS(안정기) 용량(안전율 80%), 60~400W 규격 추천 조합, 12V·24V 급전 길이를 계산합니다.

## Taiwan (繁體中文)

- [電費試算 2026（台電住宅用累進電價計算機）](https://kwhmate.com/tw/electricity-bill/): 電費試算：輸入用電度數，依台電 2026 住宅用累進電價立即計算電費，支援雙月帳單、夏月與非夏月，附各級距每度電價表。
- [LED 燈泡電費・省電計算機（換 LED 一個月省多少電費）](https://kwhmate.com/tw/led-savings/): LED 燈泡電費計算：10W LED 一個月多少電費？日光燈、燈泡換成 LED 每月可省多少？依台電住宅用累進電價計算，並試算更換費用回本時間。

## Philippines (English)

- [Meralco Bill Calculator — kWh to Peso (October 2026 rates)](https://kwhmate.com/ph/meralco-bill-calculator/): Free kWh calculator for the Philippines: enter monthly kWh to estimate your Meralco bill at the October 2026 rate (₱15.06/kWh at 200 kWh).
- [LED Savings Calculator (Philippines)](https://kwhmate.com/ph/led-savings/): See how much you save per month by switching to LED lights, using the latest Meralco rates, and how many months until they pay for themselves.

## Japan (日本語)

- [電気料金計算機 2026（東京電力 従量電灯B）](https://kwhmate.com/jp/electricity-bill/): 使用量（kWh）と契約アンペアを選ぶだけで東京電力「従量電灯B」の電気料金を計算。3段階料金、燃料費調整額、2026年度再エネ賦課金4.18円に対応。他社は単価入力も可能。
- [LED節約計算機（電気代はいくら安くなる？）](https://kwhmate.com/jp/led-savings/): LED電球・LEDシーリングライトに替えると1か月の電気代がいくら安くなるか、交換費用の回収期間まで計算。東京電力「従量電灯B」の料金で計算します。

## Calculator API for AI agents (free, no key)

- [API index](https://kwhmate.com/api/v1/): JSON list of all calculators with parameters (kWhmate, Korea Survival Kit and 계산메이트)
- [OpenAPI 3.1](https://kwhmate.com/api/v1/openapi.json): schema for tools and ChatGPT GPT Actions; GET /api/v1/<id>?… returns the result with its reference date, source and page URL
- [MCP server](https://kwhmate.com/api/mcp): remote MCP (Streamable HTTP), one tool per calculator
- [Developer guide](https://kwhmate.com/developers/): examples, limits (60 requests/minute) and setup

## Optional

- [가전별 한 달 전기요금표](https://kwhmate.com/ko/cost/): 17 appliances × hours of use, monthly cost in won
- [블로그용 무료 계산기 위젯](https://kwhmate.com/ko/embed/): embed code (iframe) for the Korean calculators
- [계산기 사용 리포트](https://kwhmate.com/report/): calculator usage report — anonymous 30-day range statistics per calculator, loaded live from https://kwhmate.com/api/stats?days=30 (cite the page URL)
- [About](https://kwhmate.com/about.html): who makes the calculators and how the numbers are checked
- [Korean calculators RSS](https://kwhmate.com/ko/feed.xml)
- [Korea Survival Kit](https://koreasurvivalkit.com/llms.txt): sister site — Korea travel guides, taxi fare and tax refund calculators
- [계산메이트](https://gyesanmate.com/llms.txt): sister site — Korean education, tax, pay and family calculators (year-end tax refund, minimum wage take-home pay, parental leave pay, child allowances, US stock capital gains tax and car tax prepayment moved there from kWhmate in October 2026)