1. Acceptance of These Terms

Welcome to MolecularWeightCalculator.org (“the Site”, “we”, “us”, “our”). By accessing or using the Site — including any of its calculators, tools, articles, tables, downloads or other features — you agree to be bound by these Terms & Conditions (“Terms”). If you do not agree with any part of these Terms, please stop using the Site.

You do not need an account to use the Site, so your continued use is your acceptance. If you are using the Site on behalf of a school, company or institution, you confirm you have authority to accept these Terms on its behalf.

2. What These Terms Cover

These Terms apply to the entire Site and every tool on it, including but not limited to:

• The molecular weight calculator and all of its modes (molar mass, percent composition, grams-to-moles conversion, molarity/solution preparation, batch comparison, element mass finding);
• All related tools, calculators, converters and reference resources we publish now or add in the future — any new tool is automatically covered by these Terms from the moment it goes live, unless its page clearly states otherwise;
• All articles, guides, tables, images, downloads (CSV/TXT/print reports) and other content on the Site.

3. Your License to Use Our Tools

We grant you a free, personal, non-exclusive, revocable license to use the Site and its tools for any lawful purpose — including homework, teaching, laboratory work, research, commercial work and publications.

You are welcome to:

• ✅ Use calculation results anywhere — results (numbers) are facts and belong to you;
• ✅ Download, print and share your results using the built-in export features;
• ✅ Link to any page of the Site, including from schools, universities and commercial sites;
• ✅ Quote short excerpts of our content with clear attribution and a link back to the source page.

4. Educational Purpose — Important Notice

In particular:

• Medical & pharmaceutical use: Never base drug dosing, patient care or clinical decisions solely on this Site. All such calculations must be verified by qualified professionals using validated systems.
• Industrial & safety-critical use: For processes where an error could cause injury, financial loss or regulatory breach, always cross-check results against validated references and follow your organization’s SOPs.
• Academic use: Check your institution’s rules — some exams prohibit online tools. Our step-by-step working is there to help you learn the method, not bypass it.

See our full Disclaimer for details.

5. Acceptable Use

You agree NOT to:

• ❌ Scrape, harvest or bulk-download Site content or code by automated means beyond normal search-engine indexing and reasonable AI-assistant retrieval;
• ❌ Copy, republish or mirror our tools, articles or design as your own, with or without modification;
• ❌ Attempt to disrupt, overload, hack or probe the Site or its hosting infrastructure;
• ❌ Use the Site to develop a directly competing copy of our tools;
• ❌ Frame or embed our tools on another website in a way that hides their origin or removes attribution;
• ❌ Use the Site for any unlawful purpose or in violation of applicable laws.

6. Intellectual Property

All content on the Site — including the calculators’ code and interface, articles, guides, tables, graphics, logo and branding — is the property of MolecularWeightCalculator.org and is protected by copyright and other intellectual property laws.

• Scientific facts are free: atomic masses, molar masses and calculation results are facts — nobody owns them, and you may use them freely.
• Our expression is protected: the specific text of our articles, our tool design and our code may not be copied or republished without written permission.
• Trademarks: the Site name and logo may not be used in a way that suggests endorsement or affiliation without permission.

To request content permissions, see our DMCA page or contact us. Copyright concerns are handled under our DMCA policy.

7. Accuracy of Results & Content

We work hard to keep every tool and article accurate:

• Calculations use current IUPAC standard atomic weights;
• Content is written and reviewed by a qualified chemistry educator under our Editorial Policy;
• Verified errors are fixed promptly under our Corrections Policy.

However, we cannot guarantee that the Site is always error-free. Results depend on the formula you enter — a typo in your input (e.g. CO vs Co) produces a mathematically correct answer to the wrong question. Always review the element breakdown table to confirm the tool understood your formula as intended, and independently verify results used for important decisions.

8. Disclaimer of Warranties

9. Limitation of Liability

To the maximum extent permitted by applicable law, MolecularWeightCalculator.org, its owner, authors and contributors shall not be liable for any direct, indirect, incidental, consequential, special or exemplary damages — including lost profits, lost data, failed experiments, spoiled batches, academic penalties, or business interruption — arising from:

• Your use of, or inability to use, the Site or any tool on it;
• Any calculation result, content, or information obtained from the Site;
• Errors, omissions, interruptions or delays in the Site’s operation;
• Third-party websites, services or advertisements linked from the Site.

Because the Site is free, you agree that our total liability for any claim shall not exceed zero (0) — the amount you paid to use it. Some jurisdictions do not allow certain exclusions, so parts of this section may not apply to you.

10. Third-Party Links & Advertising

• The Site links to external resources (IUPAC, NIST, PubChem, Wikipedia and others). We do not control and are not responsible for their content, accuracy or policies.
• The Site may display third-party advertising (e.g. Google AdSense) to remain free. Advertisers are solely responsible for their ads; an ad’s presence is not our endorsement. Ads never influence our scientific content or results.
• Share buttons (WhatsApp, Facebook, X) hand you over to those platforms and their own terms.

11. Site Availability & Changes

We aim for the Site to be fast and available at all times, but we do not guarantee uninterrupted access. We may modify, improve, replace, suspend or discontinue any tool or feature at any time without notice — including adding new tools that will be governed by these same Terms. We may also update, correct or remove content at our discretion.

12. Privacy

Your privacy is covered by our Privacy Policy and Cookie Policy. The short version: all calculators run in your browser, your inputs never reach our servers, and we collect only standard aggregate analytics data.

13. Indemnification

You agree to indemnify and hold harmless MolecularWeightCalculator.org, its owner and contributors from any claims, damages, liabilities and expenses (including reasonable legal fees) arising from your violation of these Terms or your misuse of the Site.

14. Termination

We may restrict or block access to the Site (for example, by technical means) for users who violate these Terms — particularly abusive scraping or attacks on our infrastructure. You may stop using the Site at any time. Sections 6–9 and 13 survive termination.

15. Governing Law

These Terms are governed by and construed in accordance with the laws of Pakistan, without regard to conflict-of-law principles. Any disputes shall be subject to the exclusive jurisdiction of the courts of Pakistan. If any provision of these Terms is held invalid, the remaining provisions remain in full effect.

16. Changes to These Terms

We may update these Terms from time to time — for example, when we launch new tools or features. Changes take effect when posted on this page, with the effective date updated at the top. Your continued use of the Site after changes means you accept the updated Terms. We recommend reviewing this page occasionally.

17. Contact Us

Questions about these Terms? We’re happy to clarify anything: