About
A quiet tool, built with care.
We built this calculator because the others insulted us. They blinked. They begged for our email address. They served three advertisements before they served an answer. We wanted something a Bond Street accountant could use without embarrassment, and a market trader in Leeds could use without a manual.
So we wrote it. One page. One purpose. One clean answer, every time. The arithmetic follows HMRC's published rounding conventions. The interface follows nobody's conventions but our own — quietly Edwardian, unapologetically functional.
We charge nothing because nothing is what this should cost. If it saves you ten seconds on a Tuesday, our work is done.