Contact us
We are happy to hear from you, whether you found a mistake, have an idea for a new calculator or simply have a question about how a result was worked out.
Write to [email protected]. We usually reply within two to three working days.
Reporting a mistake
To help us check quickly, please include:
- the address of the calculator page,
- the numbers you entered,
- the result you got and the result you expected, and
- if possible, the source you are comparing with.
Suggesting a calculator
Tell us what you are trying to work out and, if you know it, the formula or the organisation that defines it. Practical, everyday requests are the ones we build first.
Please do not send medical, financial or other personal details by email. Our calculators give general estimates and we cannot give individual advice.