Privacy-First Percentage Calculator: How We Compare to Calculator.net, Omnicalculator, and Calculatorsoup
Short version: Calculator.net, Omnicalculator, and Calculatorsoup are excellent, comprehensive sites with hundreds of calculators each — they're industry leaders for a reason. iPercentageCalculator takes a narrower scope (percentage and finance only) but processes everything in your browser and ships in English and Spanish. Pick the one that matches what you're actually optimising for.
The honest summary
If you searched "percentage calculator" today, the top results would almost certainly be Calculator.net, Omnicalculator, and Calculatorsoup. They've been online for years, they cover every type of calculation imaginable, and they handle billions of pageviews per year. They're good at what they do.
So why does iPercentageCalculator exist? Because we made different tradeoffs:
- Narrow scope, deep focus. We do percentage math and personal finance well — not 1,200 calculator types where some are bound to be neglected.
- Client-side calculations. The math runs in your browser; we never see or store the numbers you type.
- Bilingual from day one. Every calculator and every blog post has a Spanish counterpart at
/es/, not a third-party translation widget.
None of these advantages will matter to most people most of the time. But if any one of them matters to you for your use case, that's why we're here.
Side-by-side comparison
Based on publicly available information from each site's homepage and privacy policy as of May 2026:
| iPercentageCalculator | Calculator.net | Omnicalculator | Calculatorsoup | |
|---|---|---|---|---|
| Free to use | Yes | Yes | Yes | Yes |
| Number of calculators | ~12 (percentage + finance) | Hundreds (broad) | Hundreds (broad) | Hundreds (broad) |
| Calculations run in browser | Yes (client-side) | Generally yes | Generally yes | Generally yes |
| Numbers you type sent to server | No | Not for the math itself | Not for the math itself | Not for the math itself |
| Advertising | Yes (Google AdSense) | Yes | Yes | Yes |
| Account / signup required | No | No | No | No |
| Spanish version of every page | Yes (/es/) | Some pages | Many pages | No (English only) |
| Chart visualizations on calc pages | Yes (Chart.js) | Some calculators | Yes on many | Limited |
| Last-reviewed dates on content | Yes (visible byline) | Not consistently | Varies by page | Not consistently |
Where the big three are better
Breadth of coverage
Calculator.net, Omnicalculator, and Calculatorsoup each offer hundreds of calculator types — physics, chemistry, health (BMI, calorie, pregnancy), construction, gaming, even niche stuff like dog age conversion. If you need to calculate something obscure, one of them almost certainly has it.
iPercentageCalculator deliberately covers about a dozen tools centred on percentage and personal finance: general percentage, compound interest, simple interest, SIP, SWP, EMI, loan, tip, discount, sales tax, and GST. For anything outside that scope, you'll want one of the larger sites.
Search authority
Those three sites have been live for over a decade and have backlink profiles built over hundreds of articles citing them. They'll usually rank above newer sites for generic queries like "percentage calculator." That's earned authority, not a flaw — it's just how Google search works.
Brand recognition
If someone tells you to "just use calculator.net," chances are they've used it before. That kind of word-of-mouth familiarity is real value, and it takes years to build.
Where we made different tradeoffs
Privacy posture
All four sites perform calculations in the browser using JavaScript — none of them sends your numbers to a server for processing. That part is industry standard.
The differences are in what else happens on the page. Each site's published privacy policy is the source of truth, and we encourage you to read them: Calculator.net, Omnicalculator, Calculatorsoup, and ours.
What you'll see in the policies, broadly speaking, is that all four serve ads (which involve third-party cookies and data exchange with ad networks like Google's), and all four use some form of analytics. The differences are usually in the specifics — number of ad partners, kinds of data shared, retention periods. None of this is unusual for a free ad-supported web service.
What we've tried to do differently:
- We use a single analytics tool (Plausible) that doesn't set cookies or track individuals.
- Our visible front-page messaging is specifically about calculation data — we don't put numbers you type anywhere except your own browser.
- Our cookie banner and CCPA "Do Not Sell" page are present and easy to find.
If privacy maximisation matters to you, you can also run any of these calculator sites with a content blocker (uBlock Origin, Privacy Badger) and get most of the way to the same outcome on any of them.
Bilingual content (English + Spanish)
Every calculator and every blog post we publish has a fully translated Spanish version at /es/..., with proper hreflang markup so Google serves the right language to the right users. The big three handle internationalisation differently — some pages are translated, others aren't.
If you read primarily in Spanish, this might matter. If you read in English, it doesn't.
Visible byline and review dates
Every blog post on our site shows the publication date and the date it was last reviewed for accuracy. We update content periodically and refresh the "Last reviewed" date when we do. The big three update content too, but they don't always surface the dates as prominently — which makes it harder for you to judge content freshness.
Honest "which should you use"
Some genuine "use them instead of us" scenarios:
- You need a calculator we don't offer — BMI, calorie, mortgage refinance break-even, statistics. Try Calculator.net or Omnicalculator first.
- You need a tool in a language we don't support — French, German, Portuguese, etc. Omnicalculator has the broadest language coverage.
- You like a particular interface — many users prefer Omnicalculator's category-driven navigation. That's a perfectly valid reason.
And some "we might be a better fit" scenarios:
- You're specifically looking for percentage or basic finance math with detailed worked examples and recently-reviewed content.
- You want a fully bilingual experience rather than a partial translation.
- You prefer pages that show review dates so you know the content is maintained.
Disclaimer
Calculator.net, Omnicalculator (omnicalculator.com), and Calculatorsoup (calculatorsoup.com) are trademarks of their respective owners. We have no affiliation with, sponsorship by, or endorsement from any of these sites. This comparison is based on publicly available information from each site's homepage and privacy policy as of May 2026, and on our own use of each site. Site features change over time; we periodically review and update this page. If anything here is factually incorrect, please contact us and we'll correct it.
Try our calculators
Start with the main percentage calculator for "X% of Y" or "X is what % of Y" questions. For shopping and dining, see the discount calculator or tip calculator. For longer-term planning, the compound interest calculator shows how money grows over decades, and the SIP calculator handles monthly investment scenarios. Browse all 12 tools from the homepage or the blog for detailed how-to guides.