Privacy Policy

This Privacy Policy governs the manner in which Decimals Calculator (referred to herein as "we", "us", "our", or the "Service"), accessible via https://decimalscalculator.com, handles user privacy and personal data.

This policy applies to all visitors, registered or non-registered users, educators, students, and mathematical professionals globally who access:

• Our primary English website (decimalscalculator.com);
• All 18 international localized subdomains and subdirectories (including /es/, /hi/, /fr/, /de/, /ar/, and others);
• All 50+ specialized decimal calculators, converters, algorithms, place-value charts, and mathematical tools hosted on the domain.

By accessing or using our website, you acknowledge that you have read, understood, and accept the practices outlined in this Privacy Policy. If you do not agree with any terms within this policy, your sole recourse is to discontinue using Decimals Calculator.

We specifically built Decimals Calculator to respect absolute computational confidentiality. When you interact with our tools:

• Local Math Execution: Whether you are converting a repeating decimal to a fraction (0.666... → 2/3), calculating high-precision square roots, analyzing decimal place values, performing large division equations, or adjusting rounding thresholds, the mathematical execution is computed purely within your browser's local sandbox memory (RAM).
• No Transmission of Equation Strings: We do not log, transmit, intercept, or analyze the numbers or problems you type into our calculator fields. When you navigate away from the page, close your browser tab, or refresh, the calculation input is immediately discarded from volatile browser memory.
• No Cloud Syncing of Student Work: We do not operate a remote database storing user calculation histories, exam answers, or homework solutions.
• Private Financial & Scientific Figures: Because calculations never reach our infrastructure, users working with sensitive numbers—such as payroll figures, engineering tolerances, laboratory decimal ratios, or personal budgets—can rely on guaranteed computational privacy.

We process information exclusively for lawful, legitimate, and clearly defined operational purposes:

• Providing & Maintaining Service Reliability: Ensuring fast calculation speeds, optimizing edge caching, and maintaining 99.9% uptime across all routes.
• Security & Abuse Prevention: Identifying automated bot scrapers, rate-limiting malicious traffic, preventing vulnerability exploits, and defending against DDoS disruptions.
• Algorithm & Tool Accuracy: Reviewing user-submitted bug reports to rectify any edge cases in decimal rounding, precision limits, or formula proofs.
• Responding to Inquiries: Replying to user feedback, educational partnership inquiries, or legal notifications submitted to our support team.
• Compliance with Legal Obligations: Satisfying statutory requirements under applicable consumer protection, data privacy, and copyright laws.

Strict Prohibition on Data Monetization: We do not engage in behavioral user profiling, do not build user dossiers, and do not sell email addresses or user activity to third parties.

We distinguish transparently between HTTP Cookies and Client Browser Storage (`localStorage`):

1. Client Browser LocalStorage (Stored on Your Device)

To offer a personalized math experience without requiring an account, Decimals Calculator utilizes standard HTML5 window.localStorage. This data lives purely on your personal computer or mobile phone:

• Precision Preferences: Remembers your preferred decimal places setting (e.g., 2 decimal places for financial calculations vs. 8 decimal places for scientific calculations).
• Display Settings: Retains your preference for fraction displays (mixed fractions vs. improper fractions) and visual step-by-step accordion states.
• Optional Local Calculation History: If you use the local history feature on certain calculator tools, results are stored in your device's browser storage. This data is NEVER uploaded to our servers and can be wiped instantly using our on-page control or your browser settings.

2. HTTP Cookies

A cookie is a small text file placed on your device by your web browser. We categorize cookies as follows:

• Strictly Necessary Cookies: Deployed by our CDN infrastructure (Cloudflare) to distinguish legitimate human visitors from malicious bots, maintain load balancing, and safeguard website integrity. These cookies do not store personally identifiable data and cannot be switched off in our systems without compromising site availability.
• Third-Party Advertising Cookies: Disclosed in Section 6 below, third-party partners like Google may set cookies to serve contextually relevant advertisements.

3. How to Manage and Disable Cookies

You have the right to accept or decline cookies. Most web browsers automatically accept cookies, but you can modify your browser settings to decline cookies if you prefer:

• Google Chrome: Settings → Privacy and Security → Third-party cookies
• Mozilla Firefox: Settings → Privacy & Security → Enhanced Tracking Protection
• Apple Safari: Preferences → Privacy → Block all cookies
• Microsoft Edge: Settings → Cookies and Site Permissions

Note: Because our mathematical calculators run client-side, blocking cookies will NOT impair your ability to perform math calculations on Decimals Calculator.

To keep Decimals Calculator 100% free and accessible to students, educators, and anyone worldwide, we may partner with reputable third-party infrastructure and advertising providers:

A. Content Delivery & Edge Security (Cloudflare)

We route all website traffic through Cloudflare, Inc. (Cloudflare Privacy Policy) to deliver ultra-fast SSL/TLS encrypted page loads, global edge caching, and defense against malicious botnets. Cloudflare may process transient technical log information as a Data Processor under standard contractual safeguards.

B. Web Fonts (Google Fonts)

We utilize Google Fonts to display clear, accessible mathematical typography. These font files are cached by your browser for optimal performance, in accordance with Google's privacy-focused font serving guidelines.

C. Google AdSense & Certified Advertising Partners

We may display third-party advertisements served by Google AdSense and certified advertising exchanges. Please take note of the following required disclosures:

• Third-party vendors, including Google, use cookies to serve ads based on a user's prior visits to our website or other websites on the Internet.
• Google's use of advertising cookies enables it and its partners to serve ads to users based on their visits to Decimals Calculator and/or other sites across the World Wide Web.
• Users may opt out of personalized advertising by visiting Google Ads Settings.
• Alternatively, you can opt out of third-party vendor cookies for personalized advertising by visiting www.aboutads.info/choices or for European users, www.youronlinechoices.com.

If you are a resident of the European Economic Area (EEA), Switzerland, or the United Kingdom, you possess statutory rights under the General Data Protection Regulation (EU GDPR) and the UK Data Protection Act 2018 (UK GDPR):

Automated Individual Decision-Making: Decimals Calculator does not engage in automated decision-making or profiling that produces legal or significant effects on users.

Filing a Complaint: You also have the right to lodge a complaint with your local Data Protection Authority (such as the ICO in the UK, CNIL in France, or DPC in Ireland) if you believe our data practices violate statutory law.

Under the California Consumer Privacy Act of 2018 (CCPA) as amended by the California Privacy Rights Act of 2020 (CPRA), California consumers possess distinct privacy rights:

Your Rights Under California Law:

• Right to Know: You may request the categories and specific pieces of personal information collected about you over the past 12 months.
• Right to Delete: You may request that we delete personal information collected from you, subject to legal exceptions.
• Right to Correct: You may request correction of inaccurate personal information we maintain about you.
• Right to Non-Discrimination: We will never discriminate against you (such as by denying services, degrading calculation accuracy, or charging different rates) for exercising any of your CCPA/CPRA rights.

California Shine the Light (Civil Code § 1798.83): California residents may request once per calendar year whether we have disclosed personal information to third parties for their direct marketing purposes. We do not disclose personal information to third parties for direct marketing.

Protecting young learners and student privacy is of paramount importance to us. Decimals Calculator is widely used as a digital learning aid in elementary, middle, and high school classrooms for topics such as long division, recurring decimals, fraction simplifications, and scientific notation.

If a parent, guardian, or educator discovers that a child under 13 has inadvertently provided personal contact information through our contact form, please notify us immediately at contact.decimalscalculator@gmail.com. We will promptly expunge such information from our records.

We implement industry-standard cryptographic and architectural measures to safeguard data against unauthorized access, alteration, disclosure, or destruction:

While we deploy stringent safeguards, no method of electronic internet transmission or storage is 100% invulnerable. We encourage users to maintain up-to-date operating systems and modern web browsers.

We practice strict data minimization. We retain personal and technical records only for as long as strictly necessary to fulfill the purposes set out in this policy:

To exercise any of your privacy rights (such as submitting a GDPR Subject Access Request, CCPA deletion request, or inquiring about our calculation architecture), please reach out to our privacy representative using any of the following channels:

Response Timelines: We acknowledge all privacy inquiries within 48 business hours and resolve formal requests under GDPR or CCPA within the statutory 30-day window. To prevent unauthorized disclosures, we may request verification of your email ownership before processing requests relating to previous email communications.

Revisions and Updates to This Policy

We may update this Privacy Policy from time to time to reflect changes in regulatory standards, calculator features, or technical infrastructure. Any revisions will be reflected on this page with an updated "Last Reviewed" date and incremented version number at the top. We encourage visitors to periodically review this page for the latest updates.