Contact Proportion Calculator

Email contact@proportion-calculator.net for calculation errors, source questions, accessibility problems, privacy questions, or general feedback about this website.

Reporting a Calculation Problem

To make a report reproducible, include as much of the following as you can:

• the exact page URL;
• every value and option entered;
• the result shown and the result you expected;
• the browser and device type;
• the steps that reproduce the problem; and
• a source or independent calculation, if one is relevant.

Do not include private records, confidential business information, patient information, financial account details, or any other sensitive personal data. The calculators do not need names or identifiers to perform their calculations.

The Corrections Policy explains how a reported issue is reproduced, checked, fixed, and verified. For questions about formulas, rounding, or source selection, first review the Methodology.

Accessibility and Content Feedback

Reports about keyboard access, screen-reader labels, color contrast, mobile layout, unclear wording, or a broken source link are welcome. Please identify the affected page and describe what prevented you from completing the task.

Contact and Privacy

Email is the only contact channel currently published; the site does not use a contact form. An email is processed by the sender’s and recipient’s email providers and may be retained as needed to understand and resolve the message. See the Privacy Policy for more detail. A response time or reply to every message cannot be guaranteed.