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Plain-language guides to the things our tools calculate — land units, Zakat, income tax, gold, body metrics, and construction estimating. Written to be read, not just skimmed.
Why the same word — Marla — can mean two different sizes a few kilometres apart, and how to check what you are actually buying.
Read guideThe 2.5% is the easy part. The real questions are what counts, when the clock starts, and which nisab to use — answered here.
Read guideWhy your whole salary is never taxed at the top rate, and how to read the slab table without panicking about a raise.
Read guideThe sticker rate is only half the bill. Here's how karat, weight, and making charges combine into the number you actually hand over.
Read guideBMI is a screening shortcut, not a verdict. Here's how to read it honestly and which numbers to check alongside it.
Read guideUnder-order and the job stops; over-order and money sits in a corner hardening. Here's how the trade gets it right.
Read guideThe monthly number is the easy part. The expensive part is the total — and tenure controls it more than the interest rate does.
Read guideFaraiz is one of the most precise systems in Islamic law. Here's how an estate is settled, in order, before any share is worked out.
Read guideMost of the planet is metric; a few big holdouts aren't. Here's how to move between them without the errors that have crashed spacecraft.
Read guidePrayer times are astronomy, not a fixed timetable. Understanding the sun angles explains why your two favourite apps don't always agree.
Read guideA calculator hands you a number in a second, but the number is only as useful as your understanding of it. These guides are the context the tools can't fit on a results screen — why a Marla in the city differs from one in a village, what actually makes Zakat due, how a tax slab really behaves when you cross it.
Every guide is hand-written, dated, and maintained against the standards on our methodology page, and links to the relevant free tools so you can move straight from understanding to doing.
A calculator gives you a number; a guide explains the reasoning behind it. Guides are long-form articles written to teach a topic — what a Marla really is, how Zakat's nisab works, why a tax raise isn't a trap — and they link out to the relevant tools so you can act on what you've read.
They're written and maintained by Muhammad Salman Saleem, the developer who builds the calculators themselves, against the standards documented on the methodology page. Each guide is dated and updated when the underlying rules change.
Several are — land units, Zakat, income tax, and gold buying reflect Pakistani and broader South-Asian practice, which is also useful to the Gulf diaspora. Others, like the body-metrics and construction-estimating guides, are universal.
Browse 159 free calculators and converters across 10 categories.
Zakat, Mahr, Qurbani, Faraiz inheritance, Salah times, Qibla direction, Hijri calendar, and Sehri/Iftar — all in one place.
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Price, purity, weight, and karat calculators for precious-metal buyers, sellers, and jewellers.
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Essential tools for property, land, and building work.
Handy utilities for developers, writers, and everyday use.
Shareable, lighthearted tools for curiosity and entertainment.