Privacy Policy

Smartly Calculators (“we,” “us,” or “our“) respects your privacy. This Privacy Policy explains what information we collect when you visit smartlycalculators.com, how we use it, and the choices you have. We’ve written this in plain English instead of legalese — if anything is unclear, email us and we’ll explain.

1. Who We Are and How to Reach Us

Smartly Calculators operates the website at smartlycalculators.com as a free online directory of mathematical, financial, health, and everyday-life calculators. For any privacy-related question or to exercise the rights described below, contact us at [email protected].

2. Information We Collect

We have intentionally designed our service to collect as little personal information as possible. We collect three categories of data:

a) Information You Provide Directly

• Contact form submissions: name, email address, the topic of your inquiry, and the message you write.
• Calculator request submissions: name, email, the calculator you’re requesting, category, details, and optional formula reference.
• Embed request submissions: first name, last name, email, and the domain where you intend to embed our calculator.
• Newsletter subscription: email address only.

b) Information Collected Automatically

• Server logs: your IP address, browser type, operating system, referring page, and timestamps. This is standard hosting log data retained for security and abuse prevention.
• Analytics data: pages visited, approximate location (country/region only), device category, time on page, and source of traffic. This is aggregated and cannot be tied to you individually.
• Advertising data: where an advertisement is served, our advertising partner Mediavine and the advertising partners it works with may receive your IP address, browser and device type, and the page you are viewing, and may set or read their own cookies. We do not receive that data ourselves. Section 5 sets out exactly what is collected and where the full partner list is published.
• Cookies and similar technologies: details in our Cookie Policy.

c) Information We Do Not Collect

• Calculator inputs (loan amounts, BMI values, Zakat amounts, etc.) are processed entirely in your browser. We never see them.
• We do not require account creation. There is no login, password, or user profile.
• We do not collect payment information because all our calculators are free.

3. How We Use Your Information

We use the information we collect strictly for these limited purposes:

• To respond to your contact, embed, or calculator-request submission.
• To send the newsletter, if you’ve subscribed (you can unsubscribe at any time using the link in every email).
• To monitor traffic patterns, identify popular calculators, and improve the site.
• To detect, prevent, and respond to fraud, abuse, security incidents, or technical issues.
• To comply with legal obligations.

4. Legal Bases for Processing (GDPR)

If you are in the European Economic Area, the United Kingdom, or another jurisdiction with similar protections, we rely on the following legal bases under the General Data Protection Regulation:

Consent

For non-essential cookies and newsletter subscription. You may withdraw consent at any time.

Legitimate interest

For fraud prevention, basic site analytics, and responding to your inquiries.

Legal obligation

When we must retain or disclose data to comply with applicable law.

5. Cookies and Tracking Technologies

We use a small number of cookies for essential functionality (dark-mode preference, last-used calculator inputs stored locally) and optional anonymous analytics. See the Cookie Policy for the complete list of every cookie this site can set.

Advertising and third-party advertising cookies

Calculator pages may carry advertising. Some placements are sold directly by us and served from this site as a static image or plain HTML: those set no cookies and read no device identifiers. Calculator pages may also carry programmatic advertising managed by Mediavine, which sells this site’s advertising space on our behalf and works with the advertising partners named in its published partner list. Where Mediavine serves an advertisement, those partners set and read their own cookies to deliver it, to cap how often you see it, to measure it, and — only where you have allowed it — to personalise it.

If you are in the European Economic Area, the United Kingdom or Switzerland, Mediavine’s consent management platform asks for your choice before any advertising cookie is set, and you can change that choice at any time from the link in the site footer. Refusing does not remove the advertising: it means you are shown non-personalised advertising instead. Outside those regions, advertising loads by default and you can opt out through the industry links in the section below.

We treat Global Privacy Control and Do Not Track as a refusal of our own optional analytics, worldwide and without showing you a banner. Nothing you type into a calculator is sent to us or to any advertiser — calculator inputs are processed entirely in your browser. We place no advertising on the home page, the About page, the contact page or the legal pages.

Mediavine Programmatic Advertising (Ver 1.1)

The Website works with Mediavine to manage third-party interest-based advertising appearing on the Website. Mediavine serves content and advertisements when you visit the Website, which may use first and third-party cookies. A cookie is a small text file which is sent to your computer or mobile device (referred to in this policy as a “device”) by the web server so that a website can remember some information about your browsing activity on the Website.

First party cookies are created by the website that you are visiting. A third-party cookie is frequently used in behavioral advertising and analytics and is created by a domain other than the website you are visiting. Third-party cookies, tags, pixels, beacons and other similar technologies (collectively, “Tags”) may be placed on the Website to monitor interaction with advertising content and to target and optimize advertising. Each internet browser has functionality so that you can block both first and third-party cookies and clear your browser’s cache. The “help” feature of the menu bar on most browsers will tell you how to stop accepting new cookies, how to receive notification of new cookies, how to disable existing cookies and how to clear your browser’s cache. For more information about cookies and how to disable them, you can consult the information at All About Cookies.

Without cookies you may not be able to take full advantage of the Website content and features. Please note that rejecting cookies does not mean that you will no longer see ads when you visit our Site. In the event you opt-out, you will still see non-personalized advertisements on the Website.

The Website collects the following data using a cookie when serving personalized ads:

• IP Address
• Operating System type
• Operating System version
• Device Type
• Language of the website
• Web browser type
• Email (in hashed form)

Mediavine Partners (companies listed below with whom Mediavine shares data) may also use this data to link to other end user information the partner has independently collected to deliver targeted advertisements. Mediavine Partners may also separately collect data about end users from other sources, such as advertising IDs or pixels, and link that data to data collected from Mediavine publishers in order to provide interest-based advertising across your online experience, including devices, browsers and apps. This data includes usage data, cookie information, device information, information about interactions between users and advertisements and websites, geolocation data, traffic data, and information about a visitor’s referral source to a particular website. Mediavine Partners may also create unique IDs to create audience segments, which are used to provide targeted advertising.

If you would like more information about this practice and to know your choices to opt-in or opt-out of this data collection, please visit National Advertising Initiative opt out page. You may also visit Digital Advertising Alliance website and Network Advertising Initiative website to learn more information about interest-based advertising. You may download the AppChoices app at Digital Advertising Alliance’s AppChoices app to opt out in connection with mobile apps, or use the platform controls on your mobile device to opt out.

For specific information about Mediavine Partners, the data each collects and their data collection and privacy policies, please visit Mediavine Partners.

6. Sharing and Disclosure

We do not sell, rent, or trade your personal information. We share information only in these limited situations:

• Service providers who help us operate the site (hosting, email delivery, analytics, advertising) — bound by contract to use the data only for the services they perform for us. Where advertising is served, Mediavine and the advertising partners it works with act as independent third parties under their own policies, not as our processors — the full list is published at Mediavine Partners.
• Legal compliance when required by valid subpoena, court order, or to protect our legal rights.
• Business transfer if Smartly Calculators is acquired or merges with another entity, in which case the new owner will be bound by this Privacy Policy.

7. Data Retention

We retain personal information only as long as necessary to fulfill the purposes for which it was collected:

• Form submissions: up to 24 months, then automatically pruned from our system.
• Newsletter subscribers: until you unsubscribe.
• Server access logs: 90 days, then deleted.
• Analytics data: anonymized after 26 months.

8. Your Privacy Rights

Depending on your location, you may have the following rights regarding your personal data:

• Access: request a copy of the personal information we hold about you.
• Correction: ask us to correct inaccurate or incomplete data.
• Deletion: request that we delete your personal information.
• Restriction: ask us to limit how we process your data.
• Portability: receive your data in a machine-readable format.
• Objection: object to processing based on legitimate interests.
• Withdrawal of consent: withdraw any consent you previously gave.

To exercise any of these rights, email [email protected]. We will respond within 30 days. If you live in California, you have additional rights under the California Consumer Privacy Act (CCPA), including the right to know what information we collect and the right to opt out of the sale or sharing of personal information. We never exchange your personal information for money. California and several other US states, however, treat the disclosure of data to advertising partners for cross-context behavioural advertising as a “sale” or a “share”, and that is what happens when a personalised advertisement is served on this site. Residents of those states are shown a “Do Not Sell or Share My Personal Information” link by our advertising partner’s consent platform, which opts you out of that use. Separately, we treat Global Privacy Control and Do Not Track as a refusal of our own optional analytics, worldwide and automatically.

9. Children’s Privacy

Smartly Calculators is not directed at children under the age of 13, and we do not knowingly collect personal information from children. If you believe a child has provided us with personal information, please contact us and we will delete it promptly.

10. International Data Transfers

Our servers are located internationally. If you access Smartly Calculators from outside the country where our servers are located, your data may be transferred across borders. Where required, we use appropriate safeguards such as Standard Contractual Clauses approved by the European Commission.

11. Security

We use industry-standard technical and organizational measures to protect personal information, including HTTPS encryption, secure server infrastructure, regular security audits, and strict access controls. However, no internet transmission is 100% secure, and we cannot guarantee absolute security.

12. Third-Party Links

Our site may contain links to third-party websites (Wikipedia for formulas, Kitco for metal prices, etc.). These sites have their own privacy policies, and we are not responsible for their practices. Please review their policies before providing them with your information.

13. Changes to This Policy

We may update this Privacy Policy from time to time to reflect changes in our practices or legal requirements. The “Last updated” date at the top of this page will always show the most recent revision. Significant changes will be announced via a notice on the homepage or by email if you have subscribed.