How each tool works, in plain language
Every calculator on this site follows a rule. These guides write the rule out, show worked examples, and tell you where the tool stops and a human decision begins.
ہر ٹول کا طریقہ، مثالوں کے ساتھ — تاکہ آپ نتیجہ خود جانچ سکیں۔
How Zakat is calculated
The 2.5% rule, gold vs silver nisab, what counts as wealth, what to subtract, and a worked example in rupees.
Read guideHijri and Gregorian calendars
Why a Hijri year is 11 days shorter, how Umm al-Qura works, and why your mosque may announce Eid a day earlier.
Read guideWhat a correct invoice contains
The fields every invoice needs, how to number them, when to charge tax, and how to word payment terms.
Read guideMerge and split PDFs safely
What merging really does to a PDF, why quality is kept, and how to handle passwords, scans and large files.
Read guideQR codes: sizes and mistakes
How much data fits, what error correction means, how large to print, and why some codes fail in sunlight.
Read guideWhy we publish the method
A result you cannot check is a result you have to trust. For money and dates, trust should not be the only option. Each guide is written so that you can repeat the calculation on paper: the formula, the thresholds, the assumptions and an example with real numbers.
If you find a mistake in a guide or a tool, tell us — corrections are our first priority.