Contact
Last updated: September 8, 2026
You can write to us with questions, suggestions, or to exercise your data protection rights.
How and when to write to us
You can write to effenitrfut@gmail.com to report an error in a calculation (please include the tool, the values you entered and the result you expected), to suggest a calculator or an improvement, or to exercise your data protection rights. This site does not offer financial, medical or legal advice, so we cannot help with personal cases.
You can write to us at effenitrfut@gmail.com. We try to reply within a reasonable time, though this site does not offer real-time technical support.