Effective date: November 14, 2026
Proportions are a big part of middle school math. In fact, most US students meet them in grades 6 and 7, under the Common Core standards for Ratios and Proportional Relationships. That means many of the people who use Proportion Calculator are children. So, we take their privacy very seriously.
This policy explains how we protect children under 13, how we follow the US Children’s Online Privacy Protection Act (COPPA), and what parents and teachers can do.
The Short Version for Parents
- Your child can use every calculator without an account, a name, an email address or a password.
- The numbers your child types stay in the browser. We do not store them.
- We do not knowingly collect personal information from children under 13.
- We do not let children post comments, upload files or chat with anyone on the site.
- If you think your child sent us personal information, email us and we will delete it.
What We Do Not Collect From Children
We designed Proportion Calculator so that a child never needs to share anything personal. Specifically, we do not ask children for:
- Their name, home address, school name or phone number.
- An email address or a username.
- Photos, voice recordings or videos.
- Exact location.
What the Site Collects Automatically
Like almost every website, our host records basic technical data such as IP address, browser type and the time of each visit. We use this only to keep the site running and secure, and we delete it on a regular schedule. We never use it to identify or contact a child.
COPPA allows this kind of data for the internal operation of a website, which the FTC explains in its COPPA FAQ.
Ads and Children
We may show ads to keep Proportion Calculator free. However, we never allow ads to collect personal information from users we know are under 13. Where our ad provider supports it, we request ads suitable for a general audience and turn off personalized advertising for child directed traffic. In addition, we block ad categories that are inappropriate for students, such as gambling, dating and adult content.
If a Child Contacts Us
Sometimes a student emails us a question about a calculator. When we learn that a message came from a child under 13, we:
- Reply only to answer the question, if we can do so without asking for more personal information.
- Delete the email and the child’s email address after we reply.
- Never add the child to any mailing list.
Rights for Parents and Guardians
Under COPPA, you have the right to:
- Ask whether we hold any personal information about your child.
- Review that information.
- Ask us to delete it.
- Refuse any further collection.
To use these rights, email proportioncalculator.marketing@gmail.com with the subject line “Parent Request”. We will take reasonable steps to confirm you are the parent or guardian, and then we will act within 30 days.
For Teachers and Schools
Many teachers use Proportion Calculator in class to demonstrate cross multiplication or to let students check practice problems. Here is what you should know:
| Question | Answer |
|---|---|
| Do students need accounts? | No. Students can open any tool and start solving. |
| Do we collect student education records? | No. We never receive grades, rosters or student work. |
| Can I project the tools in class? | Yes. Our Terms and Conditions allow classroom use. |
| Can I print the worksheets? | Yes, for your own classroom. |
| Can I embed a calculator on my class website? | Yes, using our official embed code. |
Because we do not collect personal information from students, schools usually do not need to send us consent forms. Still, you should always follow your own district’s technology policies.
Tips for Safe Learning Online
We also want to help families build good habits. So, here are a few simple tips:
- Teach children never to type their real name, address or school into a website they do not know.
- Encourage them to use the step by step solutions to learn the method, not just to copy the answer.
- Bookmark trusted math tools, so children do not need to search for them each time.
Changes to This Policy
If we ever change how we handle children’s information, we will update this page and the effective date above. We will never start collecting personal information from children without first meeting COPPA’s parental consent rules.
Contact Us
Questions about your child’s privacy? Email proportioncalculator.marketing@gmail.com. For our general practices, please read our full Privacy Policy.