Contact
One address, read by the person who runs the site.
Write in English if you can. We aim to reply to anything that needs a reply within three working days; a reported arithmetic error gets looked at the day we read it, because a wrong number on a grade calculator is the one bug worth dropping everything for. The site is run by one person, so a long thread about academic strategy is not something it can offer — see the last bullet below.
What to send
- Corrections. A wrong number, a broken link, a scale that does not match your school's published table, a sentence that says one thing while the calculator does another. Use the template below and the fix is usually quick.
- Suggestions. If there is a grade question you keep computing by hand, describe it — the useful ones become tools. Tell us the inputs you have and the answer you want; that is enough to judge whether it is a calculator or a paragraph.
- Permissions and citation. Teachers and student-newspaper writers ask about quoting a table or linking a tool from a syllabus or an LMS page. The short answer is yes, with attribution and a link; the terms say the same thing more carefully.
- Privacy questions. Requests about data — access, deletion, or how the consent defaults work — go to the same address and are answered by us. The short version is that the calculators send nothing anywhere; the long version is the privacy policy.
- Anything else. Questions about the site itself are welcome. Requests for academic advice will get the same honest answer every page gives: confirm with your school. We do not know your syllabus, your registrar's rounding rule, or what your scholarship requires, and guessing at them would be worse than useless.
Reporting a wrong number
Corrections are the mail we most want. Arithmetic is checkable, so a report either holds up or does not, and either way it takes minutes rather than argument. Copy this and fill it in:
- Page: the URL you were on.
- Inputs: every value you typed, including the ones you left at their defaults. If you used the tool's copy-link button, the link alone carries all of them.
- What it printed: the figure the page showed.
- What you expected: the figure you believe is right, and the arithmetic or the published policy behind it.
Here is what happens next. We reproduce it from your inputs. If the page is wrong, the wrong figure becomes a failing assertion in that tool's mirror test before anything is edited, so the corrected number is locked in and the same mistake cannot come back in a later change. If the page is right, we write back with the derivation, and if the confusion was the page's fault rather than yours, the wording gets fixed too. Either way you hear the outcome.
What we cannot do
We cannot tell you whether your instructor will round, whether a D counts for your major, whether to drop a class, or what a school will make of your transcript. Those are decisions with real consequences and they belong to the people who hold the policy — your instructor, your registrar, your advisor. Every page on this site says the same thing in a box near the bottom, and this page is where the site says it directly.