Privacy Policy

1. Introduction

DoCalculation.com ("DoCalculation," "we," "us," or "our") operates a website providing free online calculators. This Privacy Policy explains what information we collect when you visit our site, how we use it, and the choices you have.

By using DoCalculation.com, you agree to the collection and use of information as described in this policy. If you do not agree, please do not use the site.

We are committed to handling data responsibly. Our calculators run primarily in your browser - the numbers you type into a calculator are not sent to our servers for the purpose of performing the calculation.

2. Information We Collect

Information you provide directly

If you contact us by email or through our contact form, we receive the information you choose to send - such as your name, email address, message content, and any optional details (e.g., which calculator you are asking about). We use this only to respond to your inquiry.

Information collected automatically

When you visit our website, our servers and third-party services may automatically collect certain technical information, including:

• IP address (which may be truncated or anonymized by analytics providers)
• Browser type and version
• Operating system and device type
• Pages visited, time spent, and referring URL
• General geographic location (country/region level, derived from IP)
• Date and time of access

Information we do not collect

• We do not require account registration
• We do not collect payment information (the site is free)
• We do not intentionally collect sensitive personal data such as Social Security numbers, bank account numbers, or precise health records through our calculators

3. Calculator Data & Local Processing

Most calculations on DoCalculation.com are performed entirely in your web browser using JavaScript. Values you enter (loan amounts, body weight, etc.) are processed locally on your device and are not transmitted to our servers for calculation purposes.

Some calculators may store preferences in your browser's local storage (for example, unit preferences or calculation history on specific tools). This data remains on your device and can be cleared through your browser settings.

4. Cookies & Similar Technologies

Cookies are small text files stored on your device. We and our partners use cookies and similar technologies (local storage, pixels) for the following purposes:

• Essential operation: remembering preferences needed for the site to function
• Analytics: understanding how visitors use the site so we can improve it

Managing cookies

You can control cookies through your browser settings. Most browsers allow you to refuse or delete cookies. Note that disabling cookies may affect site functionality or your experience on certain pages.

5. Analytics

Google Analytics

We may use Google Analytics to understand traffic patterns, popular calculators, and how users navigate the site. Google Analytics uses cookies and collects information such as pages viewed and time on site. Google's privacy policy: policies.google.com/privacy.

6. Third-Party Services

Our site may include or load resources from third parties, including:

• Google Fonts - typography delivery
• CDN providers - delivery of JavaScript libraries (e.g., Chart.js)
• Google Analytics - traffic analytics
• Hosting provider - serves website files

These third parties have their own privacy policies. We do not control their data practices. We encourage you to review their policies.

7. How We Use Information

We use collected information to:

• Operate, maintain, and improve DoCalculation.com
• Respond to contact messages and support requests
• Understand which calculators are most useful
• Detect and prevent abuse, fraud, or security issues
• Comply with legal obligations
• Display relevant advertising (where applicable)

We do not sell your personal information for money. See Section 12 for rights regarding sharing for targeted advertising under state privacy laws.

8. How We Share Information

We may share information in these limited circumstances:

• Service providers: hosting, analytics, and advertising partners who process data on our behalf under contractual obligations
• Legal requirements: when required by law, court order, or government request, or to protect our rights and safety
• Business transfers: in connection with a merger, acquisition, or sale of assets, with notice where required by law

We do not share contact form contents with advertisers.

9. Data Retention

We retain contact emails for as long as needed to respond and maintain a reasonable record of correspondence, typically up to 3 years unless a longer period is required by law.

Server logs are retained for a limited period consistent with security and operational needs, typically 30-90 days.

Analytics data retention is governed by our analytics provider settings.

10. Security

We use HTTPS encryption for data in transit. We implement reasonable administrative and technical measures to protect information. However, no method of transmission over the Internet is 100% secure, and we cannot guarantee absolute security.

11. Children's Privacy

DoCalculation.com is not directed at children under 13 (or 16 in the EEA). We do not knowingly collect personal information from children. If you believe a child has provided us personal information, contact us at [email protected] and we will delete it promptly.

Some calculators (such as BMI for children) are educational tools intended for use by parents, guardians, or adults - not for unsupervised collection of children's data.

12. International Users

DoCalculation.com is operated from the United States. If you access the site from outside the US, your information may be transferred to, stored, and processed in the United States or other countries where our service providers operate. These countries may have different data protection laws than your country.

13. Your Privacy Rights

Depending on where you live, you may have rights to:

• Access the personal information we hold about you
• Request correction of inaccurate information
• Request deletion of your information
• Opt out of certain processing, including targeted advertising
• Withdraw consent where processing is consent-based
• Lodge a complaint with a supervisory authority

To exercise these rights, email [email protected] with your request and enough information for us to verify your identity. We will respond within the timeframe required by applicable law.

14. California Residents (CCPA/CPRA)

If you are a California resident, you have additional rights under the California Consumer Privacy Act (CCPA) as amended by the CPRA:

• Right to know what personal information we collect, use, and disclose
• Right to delete personal information we hold about you (subject to exceptions)
• Right to correct inaccurate personal information
• Right to opt out of the "sale" or "sharing" of personal information
• Right to non-discrimination for exercising your privacy rights

Categories collected (last 12 months): identifiers (IP address, email if you contact us), internet activity (pages viewed), and general geolocation.

Sources: directly from you (contact forms), automatically from your browser, and from analytics partners.

Business purposes: site operation, analytics, security, and customer support.

We do not sell personal information for monetary consideration. You may contact us at [email protected] to exercise your privacy rights.

15. European Users (GDPR)

If you are in the European Economic Area (EEA), UK, or Switzerland, our legal bases for processing include:

• Legitimate interests: operating and improving the website, analytics, security, and fraud prevention
• Consent: where required for non-essential cookies and advertising
• Contract: responding to your contact requests
• Legal obligation: where required by applicable law

You have the right to access, rectify, erase, restrict, or port your data, and to object to processing based on legitimate interests. Contact [email protected]. You may also lodge a complaint with your local data protection authority.

16. Changes to This Policy

We may update this Privacy Policy from time to time. The "Last updated" date at the top will reflect the most recent revision. Material changes will be noted on this page. Continued use of the site after changes constitutes acceptance of the updated policy.

17. Contact Us

Privacy questions or requests:

• Email: [email protected]
• Contact form: docalculation.com/contact

Related pages: Terms of Use · About Us