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Questions, corrections and missing grading scales all reach the same place. We read everything that comes in.

Is a calculator giving the wrong answer? Every calculator page has a reporting form at the foot of it. Sending it from there tells us which calculator you mean and gets it looked at first.

Send a message

So we can reply. Nothing else is done with it.

If it is about a specific calculation, the numbers you entered and the answer you expected help most.

We keep your message, your name and your email so we can reply and so we can tell whether the same problem has been reported before. Nothing else is collected. See the privacy policy.