An open-source utility used by thousands
A slab-accurate electricity-bill calculator for Bangladesh, with the core algorithm published as an open-source library.
- Role
- Creator & Developer
- Year
- 2022
- Hosting
- Static/edge hosting, with the algorithm published on npm
- Slab-accurate tariffs
- BERC
- Open-source library
- npm
- Localised for its users
- i18n
The story
Households in Bangladesh had no simple, trustworthy way to understand and check their electricity bills. E-Bill calculates monthly bills with slab-aware accuracy across all distribution companies and consumer categories.
The core calculation logic is open-sourced as an npm library, so other developers can build on it, and the whole project is public on GitHub.
What the build involved
- 1
Built a focused, accessible calculator with a clean UI and full localisation.
- 2
Extracted the slab-based calculation logic into a reusable open-source npm library.
- 3
Open-sourced the full project on GitHub for the community.
Hard parts, and how I solved them
The problem
Electricity tariffs are slab-based and vary by company and category.
What I did
A tested calculation engine that models BERC slabs precisely, packaged so it can be reused and verified.
The problem
The audience is non-technical and multilingual.
What I did
A simple, accessible interface with localisation, so anyone can check a bill in their own language.
Built with
- Next.js
- React
- TypeScript
- NextUI
- i18next
This is aWeb App Developmentproject.
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