What to write to us about
We read every message. Four kinds help the most: a bug, a wrong number, a missing tool, or a question about how something is calculated. A fifth, partnership or press questions, is welcome too.
You don't need an account, and you don't need to explain yourself at length. A sentence or two is plenty.
Reporting a bug
Tell us which tool, what you typed and what you expected. If you can, include your browser and device. A screenshot helps, though a short description is often enough.
Bugs that give a wrong number come first. Then layout problems, then small annoyances.
- The page address, or the tool name
- The exact inputs you entered
- What you saw and what you expected
- Your browser and whether you're on a phone
Suggesting a tool
Say what job you're trying to do, not just the tool's name. "I need to split a hotel bill between three couples" is more useful than "bill splitter." Requests with a clear use case move up the list.
We add tools when we can build them well. Some take a day. Others need research into rules or rates first, and that takes longer.
Questions about the math
If a result looks off, check the Learn guide for that tool first. It usually shows the formula and a worked example. If the guide doesn't clear it up, write to us and include your numbers.
We can explain how a tool works. We can't give personal financial, medical, tax or legal advice. For that, talk to a qualified professional.
What happens next
We reply when there's something to say, usually within a few days. Fixes get checked against the source, then shipped. Your message is used to answer you and to improve the site, and the privacy page explains how data is handled.
A good message, and a weak one
Weak: "Calculator doesn't work." We have no idea which calculator, which browser or what "doesn't work" means. We'll have to write back with questions, and that costs you a day.
Better: "Mortgage calculator, Chrome on Android. I entered 300000, 6.5 and 30 years. The monthly payment shows 0 until I tap the term field twice." That one we can reproduce in minutes.
You don't need to be technical. Just say what you did and what you saw. If you're unsure what a result means, say that instead. We'd rather explain it than have you walk away guessing.
Corrections, sources and rates
Many tools depend on numbers that change. Tax thresholds, platform fees, exchange rates, lease terms and unit factors all move over time. If you spot a figure that's out of date, tell us the figure, where you saw the current one and the date. A link to the official page is perfect.
We check the source before we update, and we'd rather take a day to confirm than ship a second mistake. When a correction changes how a tool behaves, the page's last-updated date changes too.
Privacy, data requests and legal notices
The calculators run in your browser, so we don't hold your inputs. The contact form is different. When you send a message, we receive your name, email and text, and nothing else is needed to reply.
If you want a message deleted, say so in a follow-up and mention the email you used. For rights requests under privacy laws, name the law and the request, such as access or deletion, and we'll answer within the time the law allows.
Takedown and legal notices should include your contact details, the page address, and a clear description of the problem.
Press, partnerships and ads
Journalists and creators are welcome to quote our tools and explain how they work. Please link back and check the numbers you cite against the page, since rates and fees change.
For partnerships, tell us what you have in mind in two or three lines: who you are, what you want to do and why it helps people using the site. We turn down offers that would push readers toward a product just for a commission. We say yes more often to simple things, like a data source, a correction or a useful guide.
Advertising enquiries get a short reply and no pressure.
Before you hit send
Check the FAQ on the tool page. Many answers live there. Look at the guide in Learn if you want a worked example. And if you only wanted to say thanks, that's welcome too. It helps us decide what to build next.
How fast we reply
We're a small team, so replies aren't instant. A clear message about a bug or an error in a result usually gets an answer within a few working days. Longer requests can take a bit more time. If you don't hear back in a week, send a short nudge, since mail sometimes lands in spam.
Messages with a screenshot, the page address and the exact numbers you typed get fixed fastest. We can't check a problem we can't reproduce.
We read everything, though we can't reply to every message, especially sales pitches and bulk outreach.
What we can't help with
We can't give legal, medical, tax or financial advice. The tools here are calculators and guides, and they don't replace a professional who knows your situation.
We also can't reset accounts on other websites, recover files or change results on third-party services we link to. If a link is broken, though, tell us and we'll fix it.
Where to send what
Bug reports, wrong results and broken links are all welcome, and so are kind words. Please write one topic per message, since it keeps threads tidy and speeds up the reply.