Contact
We usually reply within a few days.
Get in touch
Found a mistake in a formula or a translation? Have an idea for a new calculator, or a question about how a result was computed? Write to us using the form below.
To help us answer quickly, please include the page address and, for a calculation issue, the values you entered and the result you expected.
What we cannot help with
We cannot give personal medical, legal or financial advice. For decisions based on a result, please consult a qualified professional.