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The contact form below is the way to reach rrefcalculator.io. There is no phone line or public email address. Messages go to the site operator and are stored on our own server; they are not passed to any third-party service. If a reply is needed, it will be sent by email to the address you give.

• Found a wrong result or step? Choose “Report a calculation problem” and include the matrix exactly as you entered it.
• Want to contribute a guide? Read Write for us first, then choose “Write for us”.
• Privacy request? Choose “Privacy request”. The privacy policy explains your rights.

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Your name, email address, subject and message are saved on the rrefcalculator.io server with the date they were received. Your IP address is used for a short time in memory to limit repeated submissions, and is not stored with your message. Messages are deleted automatically after 12 months. Read the full privacy policy.