Contact us

We read every message. Error reports are our top priority.

Reporting an error

To help us fix it fast, please include:

• the calculator page,
• the numbers you entered,
• the result you got and the result you expected,
• a link to the official source for the correct rate, if you have one.

Other enquiries

• Suggest a calculator you would like us to build.
• Embed a calculator on your website.
• Partnerships and sponsorship for businesses such as solar installers, tax consultants and academies.

We cannot give personal tax, legal or religious rulings. For decisions about your own case, please consult a qualified professional or scholar.