Contact

Email

The fastest way to reach us is hello@daytodaytools.online. It goes to Mubarak Marzoon, who builds and writes everything here, and who reads it personally. There is no support desk and no ticket queue, so replies usually take a couple of working days rather than minutes.

Corrections come first

If you think a calculator is giving a wrong answer, that is the most valuable message this site receives, and it goes to the front of the queue. Several tools here have been fixed because the arithmetic was checked against a published reference and did not match: the shoe and ring size converters were both re-anchored after their constants turned out to be interpolated rather than sourced.

Corrections that change a result or the meaning of an article are made visibly, with the revision date shown on the page, rather than edited in silently. The editorial policy sets out how that works and how the content is researched in the first place.

What to include

To get a useful answer quickly, tell us:

• Reporting a wrong result? The tool, the exact numbers you entered, what it showed, and what you expected.
• Something broken? Your browser and device, and what you'd clicked just before.
• Suggesting a tool? What you're trying to work out and how you currently do it. The problem is more useful than the proposed solution.
• Reporting an ad? A screenshot and the page it appeared on. We can report specific advertisers to Google.

Common questions we can answer here

Can I use these tools on my own site?

Link to them freely, no permission needed. Embedding or copying the tools themselves isn't permitted; see the terms of use.

Do you store what I type into the tools?

No. Everything runs in your browser and nothing is transmitted to us. The privacy policy covers what we do and don't collect.

Who writes this, and are they qualified?

Everything is written by Mubarak Marzoon, a software engineer. Not a doctor, a dietitian or a regulated financial adviser, and the site does not claim otherwise. The health and money articles summarise guidance published by bodies such as the NHS, the World Health Organization and the Office for National Statistics, and each one lists the specific pages it drew on so you can read the original. The author page covers this in full.

Can I trust the numbers?

Check them. Every calculator states its formula in the page body, so any result here can be reproduced by hand. Where a tool relies on published constants, such as the MET values in the calories tool or the rise limits in the stair calculator, it names the source those came from. If a tool cannot reproduce an independently verifiable result, it does not ship.

Can I advertise on the site?

Advertising is handled entirely through Google AdSense, we don't sell placements directly, and we don't accept paid links, sponsored posts or guest articles. Advertisers have no involvement in what gets written, no advance sight of it, and no ability to change or remove it.

Will you link to my site?

Only if it's genuinely useful to readers of a specific page. We don't do link exchanges and we don't accept payment for links.

Privacy and data requests

For questions about your data, or to make a request under GDPR, CCPA or similar legislation, email the address above with “Privacy request” in the subject line. See the privacy policy for what we hold. Which is very little.