About KwikSum

Last updated: February 2026

KwikSum is a free collection of online calculators built for speed, simplicity, and everyday usefulness. We believe that basic tools like percentage calculators, bill splitters, and unit converters shouldn't require sign-ups, downloads, or wading through walls of adverts to use.

Why We Built This

We got tired of calculator websites that feel like they were designed in 2005 and haven't been updated since. Slow load times, cluttered layouts, intrusive advertising, and poor mobile experiences — we thought we could do better.

KwikSum is designed to be the calculator site you actually want to bookmark. Every tool loads instantly, works beautifully on any device, and gives you results in real time as you type. No page reloads, no submit buttons, no friction.

What We Offer

Our growing collection of tools currently includes a percentage calculator (with three modes), a bill splitter that divides costs proportionally by income, a tip calculator with party splitting, a loan and mortgage calculator with full amortisation schedules, a comprehensive unit converter covering seven categories, and a date calculator for finding differences or adding time periods.

All tools support multiple currencies (GBP, USD, EUR) and adjustable decimal precision.

Who We Are

KwikSum is built and maintained by a small independent team based in the UK. The site is a passion project built with a focus on quality, privacy, and user experience.

Get In Touch

Have a suggestion for a new calculator? Found a bug? Want to advertise with us? We'd love to hear from you. Head over to our contact page or drop us an email at hello@kwiksum.com.

Advertise With Us

Last updated: February 2026

KwikSum reaches a growing audience of engaged users who are actively making financial decisions, planning purchases, and managing their daily lives. If your brand aligns with our audience, we'd love to explore working together.

Why Advertise on KwikSum?

Our users are in a decision-making mindset. When someone is calculating a mortgage repayment, splitting a bill, or converting units for a purchase, they're highly engaged and often close to a buying decision. This makes KwikSum an ideal environment for relevant, non-intrusive advertising.

Available Placements

We offer several ad placement opportunities designed to integrate naturally with the user experience without disrupting it:

• Sidebar placement — Visible alongside calculator tools on desktop (250×300 or similar)
• Banner placement — Between tool listings on the homepage (728×90 leaderboard)
• Sponsored tool — Feature your brand's calculator or tool as a sponsored listing
• Newsletter sponsorship — Reach our subscriber base directly (coming soon)

Our Audience

KwikSum is a new and growing site. Traffic stats will be updated here as the site matures. Get in early with competitive advertising rates.

Pricing & Enquiries

We offer flexible pricing based on placement type, duration, and volume. For a media pack and rate card, please get in touch:

Contact Us

Last updated: February 2026

We'd love to hear from you — whether you've spotted a bug, have a suggestion for a new calculator, or want to discuss advertising opportunities.

General Enquiries

Advertising

Bug Reports

If you've found a calculation error or something isn't working properly, please include the following in your email so we can investigate quickly:

• Which calculator you were using
• What values you entered
• What result you got vs. what you expected
• Your browser and device (e.g. Chrome on iPhone, Safari on Mac)

Response Times

We aim to respond to all enquiries within 2 business days. Advertising enquiries are prioritised during business hours (Monday–Friday, 9am–5pm GMT).

Terms of Use

Last updated: February 2026

1. Acceptance of Terms

By accessing and using KwikSum ("the Website"), you agree to be bound by these Terms of Use. If you do not agree to these terms, please do not use the Website. We reserve the right to update these terms at any time, and your continued use of the Website following any changes constitutes acceptance of the revised terms.

2. Description of Service

KwikSum provides free online calculator tools for informational and educational purposes only. The tools include, but are not limited to, percentage calculators, bill splitters, tip calculators, loan calculators, unit converters, and date calculators.

3. Disclaimer of Accuracy

While we make every reasonable effort to ensure the accuracy of calculations, KwikSum is provided on an "as is" basis. We do not warrant that the results produced by any calculator will be accurate, complete, or suitable for any particular purpose. You should not rely solely on the results from this Website for financial, legal, medical, or other professional decisions. Always consult a qualified professional before making important decisions based on calculations.

4. No Financial Advice

Nothing on this Website constitutes financial, tax, legal, or investment advice. The loan calculator, bill splitter, and other financial tools are provided for general informational purposes only. You are solely responsible for any decisions you make based on the output of these tools.

5. Intellectual Property

All content on this Website, including but not limited to text, graphics, logos, code, and design, is the property of KwikSum and is protected by United Kingdom copyright law and international treaties. You may not reproduce, distribute, modify, or create derivative works from any part of this Website without our prior written consent.

6. Acceptable Use

You agree not to:

• Use the Website for any unlawful purpose
• Attempt to gain unauthorised access to any part of the Website or its systems
• Use automated tools (bots, scrapers, crawlers) to access the Website in a manner that places unreasonable load on our infrastructure
• Reproduce or mirror the Website or its content without permission
• Interfere with or disrupt the integrity or performance of the Website

7. Third-Party Links and Advertising

The Website may contain links to third-party websites and may display advertisements from third-party advertisers. We are not responsible for the content, accuracy, or practices of any third-party sites or advertisers. Your interaction with any third-party site or advertiser is at your own risk and subject to that party's terms and policies.

8. Limitation of Liability

To the fullest extent permitted by law, KwikSum and its operators shall not be liable for any direct, indirect, incidental, consequential, or punitive damages arising from your use of or inability to use this Website. This includes, without limitation, any errors or omissions in calculations, loss of data, or loss of profits, even if we have been advised of the possibility of such damages.

9. Indemnification

You agree to indemnify and hold harmless KwikSum, its operators, and any affiliated parties from any claims, damages, losses, or expenses (including reasonable legal fees) arising from your use of the Website or your breach of these Terms.

10. Governing Law

These Terms of Use are governed by and construed in accordance with the laws of England and Wales. Any disputes arising from these terms or your use of the Website shall be subject to the exclusive jurisdiction of the courts of England and Wales.

11. Severability

If any provision of these Terms is found to be unenforceable by a court of competent jurisdiction, the remaining provisions shall continue in full force and effect.

12. Contact

If you have any questions about these Terms, please contact us at hello@kwiksum.com.

Privacy Policy

Last updated: February 2026

KwikSum ("we", "us", "our") is committed to protecting your privacy. This Privacy Policy explains how we collect, use, and safeguard your information when you visit our website at kwiksum.com ("the Website"). This policy is compliant with the UK General Data Protection Regulation (UK GDPR) and the Data Protection Act 2018.

1. Data Controller

The data controller is KwikSum, contactable at hello@kwiksum.com.

2. Information We Collect

KwikSum is designed to be privacy-friendly. We do not require you to create an account, and we do not collect personal information such as your name, email address, or phone number through normal use of the Website.

We may collect the following non-personal information automatically:

• Usage data: Pages visited, time spent on pages, referring URLs, and general interaction patterns
• Technical data: Browser type and version, device type, operating system, screen resolution, and IP address (which may be anonymised)
• Cookie data: As described in our Cookie Policy

3. How We Use Your Information

We use the information collected to:

• Understand how our Website is used so we can improve it
• Monitor and analyse traffic and usage trends
• Ensure the Website is functioning correctly
• Serve relevant advertising where applicable

4. Legal Basis for Processing

Under UK GDPR, we process your data on the following legal bases:

• Legitimate interests: To operate, maintain, and improve the Website (Article 6(1)(f))
• Consent: For non-essential cookies and analytics tracking, where required (Article 6(1)(a))

5. Cookies

We use cookies and similar technologies. For full details, please see our Cookie Policy.

6. Third-Party Services

We may use the following third-party services that collect data on our behalf:

• Analytics: Google Analytics 4 — to understand traffic and usage patterns
• Advertising: We do not currently display advertising — to display relevant advertisements

Each third-party service has its own privacy policy governing the data it collects. We encourage you to review their policies.

7. Data Retention

We retain non-personal analytics data for up to 26 months. We do not retain any personally identifiable information through normal use of the Website.

8. Your Rights

Under UK GDPR, you have the following rights regarding your personal data:

• Right of access — You may request a copy of the data we hold about you
• Right to rectification — You may request correction of inaccurate data
• Right to erasure — You may request deletion of your data ("right to be forgotten")
• Right to restrict processing — You may request we limit how we use your data
• Right to data portability — You may request your data in a machine-readable format
• Right to object — You may object to processing based on legitimate interests
• Right to withdraw consent — Where processing is based on consent, you may withdraw it at any time

To exercise any of these rights, please contact us at hello@kwiksum.com. We will respond to your request within one month, as required by law.

9. International Transfers

Where third-party services transfer data outside the UK, we ensure appropriate safeguards are in place, such as Standard Contractual Clauses or adequacy decisions by the UK government.

10. Children's Privacy

The Website is not directed at children under the age of 13. We do not knowingly collect personal information from children. If you believe we have inadvertently collected data from a child, please contact us and we will delete it promptly.

11. Changes to This Policy

We may update this Privacy Policy from time to time. Any changes will be posted on this page with an updated "Last updated" date. We encourage you to review this page periodically.

12. Complaints

If you are not satisfied with how we handle your data, you have the right to lodge a complaint with the Information Commissioner's Office (ICO), the UK's supervisory authority for data protection: ico.org.uk.

13. Contact

For any privacy-related questions or requests, please contact us at hello@kwiksum.com.

Cookie Policy

Last updated: February 2026

This Cookie Policy explains how KwikSum ("we", "us", "our") uses cookies and similar technologies when you visit our website at kwiksum.com ("the Website"). This policy should be read alongside our Privacy Policy.

1. What Are Cookies?

Cookies are small text files that are placed on your device (computer, tablet, or mobile phone) when you visit a website. They are widely used to make websites work more efficiently, to provide information to website owners, and to enable certain features.

2. How We Use Cookies

We use cookies for the following purposes:

Strictly Necessary Cookies

These cookies are essential for the Website to function correctly. They include cookies that remember your preferences such as currency selection and theme choice (dark/light mode). These do not require your consent under UK law.

Analytics Cookies

We use Google Analytics 4 to collect anonymised data about how visitors use our Website. This helps us understand which calculators are most popular and how we can improve the user experience. These cookies collect information such as the number of visitors, which pages are visited, and how long users spend on the site. Analytics cookies are only loaded after you consent via the cookie banner.

Advertising Cookies

We do not currently display third-party advertising. If this changes in future, this policy will be updated accordingly.

3. Cookie List

The specific cookies we use include:

• kwiksum_theme — Stores your light/dark mode preference (strictly necessary, session)
• kwiksum_currency — Stores your selected currency (strictly necessary, session)
• kwiksum_decimals — Stores your decimal precision preference (strictly necessary, session)
• _ga — Google Analytics, used to distinguish users (2 years). _ga_G-1BY4C3TQN2 — Google Analytics, used to maintain session state (2 years). Only set after cookie consent is given.

4. Your Choices

When you first visit our Website, we will ask for your consent before placing any non-essential cookies on your device, in compliance with the Privacy and Electronic Communications Regulations 2003 (PECR) and UK GDPR.

You can also control cookies through your browser settings. Most browsers allow you to:

• View what cookies are stored and delete them individually
• Block third-party cookies
• Block cookies from specific websites
• Block all cookies
• Delete all cookies when you close your browser

Please note that blocking all cookies may affect the functionality of this and other websites.

5. Third-Party Cookies

Some cookies are placed by third-party services that appear on our pages. We do not control these cookies. The third-party providers are responsible for the cookies they set and for complying with applicable data protection laws. We encourage you to check their respective privacy and cookie policies.

6. Changes to This Policy

We may update this Cookie Policy from time to time. Any changes will be posted on this page with an updated "Last updated" date.

7. Contact

If you have any questions about our use of cookies, please contact us at hello@kwiksum.com.