Last updated: November 14, 2026
Every guide and calculator on Proportion Calculator follows the same editorial standards. This page explains how we choose topics, write and check content, cite sources, correct mistakes and keep money away from our math. We publish it because you deserve to know how the pages you rely on get made.
Our Mission
We want anyone to understand proportions, ratios and proportion statistics, not just get an answer. So, every page should leave you able to solve the next problem on your own.
How We Choose Topics
We build tools and guides based on what people actually need. Our ideas come from:
- Questions students and teachers send us.
- Topics in the Common Core math standards and in introductory statistics courses.
- Real world jobs that use proportions, such as scaling recipes, resizing images and reading survey results.
- Gaps we find where existing tools skip steps, round too early or explain nothing.
Our Writing Standards
Every page we publish must meet five standards:
- Accurate. Every formula, definition and example must be correct and match trusted references.
- Clear. We use short sentences, plain words and worked examples. If a 7th grader cannot follow a core guide, we rewrite it.
- Complete. We explain the why, not only the how. For example, we show why cross multiplication works, not just that it works.
- Practical. We include real examples, common mistakes and quick checks you can use in class or at work.
- Honest. We state limits clearly, such as when a z test does not apply to a small sample.
Sources We Trust
We back up facts and formulas with high quality sources. Our main references include:
| Topic | Primary references |
|---|---|
| Ratios and proportional relationships | Common Core State Standards for Mathematics |
| Proportion statistics, tests and intervals | NIST Engineering Statistics Handbook, OpenStax Introductory Statistics |
| Number precision and rounding | IEEE 754 standard |
| Accessibility | W3C Web Content Accessibility Guidelines |
We link to sources directly in our guides, so you can check them yourself. We avoid citing forums, anonymous blogs or content farms.
How We Check Accuracy
Before a page goes live, we:
- Solve every worked example by hand and confirm the numbers.
- Run each example through our own calculator and compare the results.
- Check definitions and formulas against at least one reference from the table above.
- Read the page on a phone to make sure tables, formulas and steps display clearly.
Our How Our Calculators Work page explains the extra testing we run on every tool.
How We Use AI
We may use AI tools to help with research, outlines or first drafts. However, AI never publishes anything on its own. A human reviews every page, checks every number by hand and rewrites anything unclear before it goes live. We never publish AI generated math without human verification, because a single wrong step can mislead thousands of students.
This approach follows Google’s guidance on helpful, people first content.
Updates and Corrections
Math does not change, but our explanations can always improve. So, we review our most used guides regularly and update them when we find a clearer example, a better method or a reader question we missed.
When we fix an error, we:
- Correct it as soon as we confirm it.
- Update the date shown on the page.
- Thank the reader who reported it, if they want credit.
To report an error, email proportioncalculator.marketing@gmail.com with the subject line “Error Report”.
Independence From Advertising
We may earn money through ads and affiliate links, and we explain this in our Disclaimer. Still, we keep a firm line between money and content:
- Advertisers never review, approve or change our guides or calculators.
- Ads never change a calculator’s result.
- We clearly label sponsored content and affiliate links.
- We only recommend products we believe genuinely help readers.
Who Is Responsible
Proportion Calculator is run by its founder, Muhammad Abdullah, who reviews and approves every page before it goes live. You can read more on our About Us page.
Questions About Our Standards
If you think a page falls short of these standards, we want to know. Email proportioncalculator.marketing@gmail.com, and we will review your concern within two business days.