xraytools.

Contact

If a number here looks wrong, or something is broken, or there is a calculation you keep doing by hand that this site could do for you, this is where to say so.

You supply
A name, an e-mail address to reply to, and the message. If a result looks wrong, the URL of the page showing it is the single most useful thing to include.
Reading it
Nothing is stored: the message is sent on and no copy is kept here. The form needs JavaScript, because every submission is checked by reCAPTCHA before it reaches the server.
What it is about
Message

If a result looks wrong, the most useful thing you can include is the URL of the page showing it — every calculator here puts its whole input in the address bar, so that one line reproduces exactly what you saw.

This form needs JavaScript, because every submission is checked by reCAPTCHA before it reaches the server. Nothing is stored: the message is sent on and the page keeps no copy of it.

What is useful to send

  • A URL. Since every calculator’s input lives in the query string, one link reproduces the exact result you are looking at — which is faster than any description and removes the guessing.
  • What you expected instead, and where it comes from. A textbook, a paper, a value from other software: a number to compare against turns a report into something that can be checked.
  • What you were trying to do. A feature request that says what problem it solves is far easier to judge than one that names a feature.

This is a one-person site and replies are not instant. Corrections to the numbers are taken seriously and dealt with first — several of the calculators here carry their working precisely so that a wrong answer can be argued with.