Linkfa Tools is a small collection of free calculators and checkers made by DaveBukar Technologies, a software studio. We build a tool only when people are searching for it and the existing answers are thin, hard to use, or do not show their working.
How every tool is made
- It shows its working. Each page explains the rule the calculator follows, with a worked example you can check by hand.
- It cites its sources. Rates, thresholds and rules come from official or scholarly sources, linked on the page with the date we last checked them.
- It is tested. Every calculator's logic is checked against known answers before it is published, and again on every change.
- It stays on your device. Calculations run in your browser. Nothing you type is sent to us or anyone else.
What the tools are not
The tools help you understand and estimate. They are not financial, tax, legal or religious advice. For a decision that matters, such as dividing an estate or filing a tax return, confirm the result with a qualified adviser or scholar.
Corrections
If you find a mistake or a rule that has changed, please use the contact form on linkfa.de. We fix errors and note the review date on the page.