I was tired of wrong KDV calculations in Turkey, so I built a free tool.
Live tool: https://www.invoiceluxe.com/tr/calculator.html
The Problem
Most calculators do this wrong:
600 TL including 20% KDV
Wrong: 600 - 20% = 480 TL
Correct: 600 / 1.20 = 500 TL net + 100 TL KDV
My tool does it correctly.
Features
- Add / Remove KDV (VAT) with %1, %8, %18 and custom rates
- Correct formula: net = gross / 1.20 for 20% case
- PWA - install on iPhone/Android, works offline, no App Store
- No signup, data stays on device
- International rates: Germany 19%, France 20%, Netherlands 21%
Why PWA?
I wanted a tool that works without App Store. It's a Progressive Web App with 25+ tools:
- Invoice Generator
- PDF Sign & Create
- JPG to PDF
- QR Code, Password Generator etc.
All 22 languages: TR, EN, DE, NL, FR, IT, ES, PT-BR, AR, JA, HI, ZH, RU...
TR version: https://www.invoiceluxe.com/tr/calculator.html
Built with Vanilla JS, offline-first.
Open source feedback welcome!
