Terms of Service

These Terms of Service (“Terms”) govern access to and use of Coffee Calculators (the “Site”), including every calculator, page and any affiliate or product link. By using the Site you agree to these Terms. If you do not agree, do not use the Site.

1. Operator identity

The Site is operated by Rafał Stybliński, located at ul. Zwycięstwa 14/105, 44-100 Gliwice, Poland. NIP: 9691497521. Contact email: contact@rafalstyblinski.pl.

The Site is an informational project. It publishes simplified brewing, grinding, water-chemistry, roasting and caffeine estimates. Nothing on the Site is a cupping score, a water lab report, a roasting profile, or professional barista, roasting, food-safety or medical advice.

2. Brewing, roasting and caffeine disclaimer

All calculators on this Site — including brew ratios, grind conversion, water chemistry, roasting, caffeine and barista tools — are for educational and informational purposes only. They are simplified mathematical estimates. They are not a lab report, a roast log, or professional or medical advice of any kind.

Results can be wrong, incomplete, outdated or inapplicable to your grinder, brewer, beans, water or skills. You must independently verify every figure. Confirm on a test brew before you scale a recipe, descale a machine or change caffeine habits. Hot water, steam and espresso equipment can scald; follow manufacturer safety instructions. Caffeine calculators are not a substitute for medical care.

You assume all risk. To the fullest extent permitted by applicable law, Rafał Stybliński and any authors, contributors and affiliates assume zero liability for property damage, burnt shots, injury, death, business interruption, financial loss, or data inaccuracies arising out of or related to the use of, or reliance on, these tools or their outputs.

3. Assumption of risk and exclusion of liability

You use the Site, the calculators and any linked products entirely at your own risk. To the fullest extent permitted by applicable law, the operator named above disclaims all warranties, express or implied, including merchantability, fitness for a particular purpose and non-infringement.

4. Affiliate disclosure

As an Amazon Associate, we earn from qualifying purchases.

We participate in affiliate programs, including the Amazon Services LLC Associates Program. We earn commissions from qualifying purchases at no extra cost to you. Listings are not endorsements, safety certifications or promises that a product is suitable for your project.

5. Acceptable use

You must not abuse the Site, disrupt it, crawl it harmfully, or present results as a design or installation we planned or signed off.

6. Intellectual property

Text, layout and code are provided so you can use the public calculators. Do not copy the Site as a competing service. You may use individual results for your own planning.

7. Privacy

Cookies and analytics are described in the Privacy Policy. The calculators work without analytics cookies.

8. Changes

We may change the Site or these Terms at any time. Continued use after an update is acceptance.

9. Governing law

These Terms and disputes related to the Site are governed by the law of Poland, excluding conflict-of-law rules, except where mandatory consumer protection law of your country of residence cannot be waived.

10. Language

The English version governs use of the English pages. If a clause is invalid, the rest remains in force.