Effective date: November 14, 2026
Welcome to Proportion Calculator. These Terms and Conditions explain the rules for using proportioncalculator.app, including every calculator, guide, worksheet and widget on the site. We wrote them in plain language, so you can actually read them in a few minutes.
By using the site, you agree to these terms. If you do not agree, please do not use Proportion Calculator.
1. What We Offer
Proportion Calculator provides free online tools that solve proportions, ratios and proportion statistics, along with guides and worksheets that explain the math. You can use the tools without an account, without payment and without limits on how many problems you solve.
We may add, change or remove tools at any time. For example, we may improve a formula, add a new step to a solution, or retire a tool that few people use.
2. Who Can Use the Site
Anyone can use Proportion Calculator, including students, parents, teachers, researchers and professionals. Children under 13 may use the calculators, ideally with a parent or teacher nearby. Please read our Children’s Privacy Policy to see how we protect young users.
3. How You May Use Our Tools
You are welcome to:
- Use any calculator for homework, classwork, study, work or personal projects.
- Share links to our pages with friends, students or colleagues.
- Show our calculators on a screen in a classroom or a training session.
- Print our free worksheets for use in your own classroom or home.
- Quote short parts of our guides with a clear credit and a link back to the page.
4. What You May Not Do
To keep the site fast and fair for everyone, you agree not to:
- Copy, republish or sell our content, code, designs or worksheets as your own.
- Scrape the site with bots, or send automated requests that slow it down for other users.
- Try to hack, overload or break the site, or bypass any security feature.
- Upload or send anything harmful, such as malware or spam, through our contact channels.
- Frame our pages inside another site in a way that hides our brand or our ads.
- Use the site for anything illegal or for cheating where your school or exam rules forbid calculator use.
5. Embedding and Citing Our Calculators
Teachers and bloggers often ask whether they can use our tools on their own sites. Yes, you can, under these conditions:
- Use the official embed code we provide, without changing it.
- Keep the visible “Proportion Calculator” credit and link in place.
- Do not place our widget on sites that promote hate, violence, adult content or illegal activity.
To cite a result in a paper or report, you can use this format: Proportion Calculator. (2026). Name of the calculator. Retrieved from the full page URL.
6. Accuracy and Your Responsibility
We test every calculator carefully, and we explain our formulas and checks on our How Our Calculators Work page. However, no software is free of errors. Rounding, typing mistakes and unusual inputs can all affect a result.
Therefore, you are responsible for checking any result before you rely on it, especially for:
- Graded tests, exams and assignments.
- Medical dosages, medication ratios or dilutions.
- Financial, legal, tax or engineering decisions.
- Research results that others will rely on.
For high stakes decisions, always confirm the result with a qualified professional. Our Disclaimer explains these limits in more detail.
7. Our Content and Intellectual Property
The Proportion Calculator name, logo, site design, calculator code, guides, worksheets, images and text belong to us or to the people who licensed them to us. They are protected by copyright and other laws.
Math itself belongs to everyone. So, you are free to use any formula, method or fact you learn here. What you cannot do is copy our specific words, code or designs.
If you believe something on our site infringes your copyright, please follow the steps on our DMCA Policy page.
8. Ads and Links to Other Sites
We may show ads and include links to outside websites, such as textbooks, standards bodies and useful products. We do not control those sites, and we are not responsible for their content, products or privacy practices. Visiting them is your choice.
9. Feedback
We love hearing ideas for new tools and improvements. When you send us feedback, you allow us to use it to improve Proportion Calculator without any obligation to pay you. We will never publish your name or email without your permission.
10. No Warranty
We provide Proportion Calculator “as is” and “as available”. To the fullest extent the law allows, we make no promises that the site will always be available, error free or suitable for your specific purpose.
11. Limitation of Liability
To the fullest extent the law allows, Proportion Calculator and its owner will not be liable for any indirect, incidental or consequential losses that come from using, or being unable to use, the site or its results. This includes lost grades, lost data, lost profits and decisions based on a calculation.
Because the site is free, our total liability for any claim will not exceed 100 US dollars.
12. Indemnity
If you misuse the site or break these terms, and someone makes a claim against us because of it, you agree to cover the reasonable costs that result.
13. Ending Access
We may block or limit access for anyone who breaks these terms, for example a bot that overloads our servers. You may stop using the site at any time.
14. Changes to These Terms
We may update these terms as the site grows. When we do, we will change the effective date at the top. If you keep using Proportion Calculator after a change, you accept the updated terms.
15. Governing Law
These terms are governed by the laws that apply where the site owner is based, unless the law of your home country gives you stronger consumer protections that cannot be waived. In that case, those protections still apply to you.
16. Contact Us
Questions about these terms? Email proportioncalculator.marketing@gmail.com or visit our Contact Us page. We reply within two business days.