Contact us
Every message goes to one inbox, read by the person who maintains the site. There is no ticketing system, no support tier and no bot in between.
What to write about
Anything, but these four cover almost everything that arrives — and each lists what turns a message into something that can actually be acted on.
A conversion looks wrong
This is the one worth writing about above all others, and it goes to the front of the queue. Every figure on the site is plain arithmetic from a published constant, so a wrong answer is a real defect rather than a matter of opinion — and it can be checked and fixed the same way you found it.
Please include
- The page URL, or the exact values you entered
- The DPI or PPI the calculator was set to
- The number it gave you and the number you expected
- Where your expected number comes from, if you have a source
Something is broken
A control that will not respond, a diagram that draws in the wrong place, a layout that breaks at your window size, a page that will not load. Front-end faults are often specific to one browser or one screen width, so the details below are what make them reproducible.
Please include
- The page URL
- Your browser and version, and whether you are on a phone, tablet or desktop
- What you did, what happened, and what you expected instead
- A screenshot if the problem is visual
A page or size is missing
If you searched for a specific size and did not find it, that is useful to know — the size pages exist because people look for those exact dimensions, so a gap is worth closing.
Please include
- The size or conversion you were looking for
- What you were trying to do with it, so the page can answer the real question
A feature request, or anything else
A unit that is not supported, a preset worth adding, a guide that would have saved you time, or a question about how a number was derived. Press enquiries and licensing questions come here too.
Before you write about a result
Two things account for most reports that turn out not to be defects, and both take a moment to rule out:
- Check which density the calculator was set to. The same pixel count is a different physical size at every DPI — 1,920 px is 20 inches at 96 PPI and 6.4 inches at 300 DPI. Both are correct. The PPI calculator explains which figure applies to your case.
- Check whether you mean DPI or PPI. They are used interchangeably for this arithmetic, but a printer's DPI rating and an image's PPI are not the same measurement. DPI vs PPI sets out the difference.
If it still looks wrong after that, it probably is — please write.