Calculators Built on Trust
Fast, reliable, privacy-first tools for everyday use. Open source, minimal data collection, and built by someone who respects your time and privacy.
Quick Calculator
Why Trust CalcWise?
We're different because we're honest about how we operate
Calculations Stay Local
Every calculation runs in your browser. I never see your inputs, never store your results. It's just you and your device—as it should be.
Open Source
The code is public on GitHub. You can see exactly how everything works, contribute improvements, or fork it for your own projects. No secrets.
Built for Speed
No bloated frameworks, no unnecessary requests. Just clean code that loads fast and gets you answers immediately. Your time matters.
Browse Calculators
Everything you need, organized by category
Money & Finance Tools
Health & Fitness
Mathematical Tools
Unit Converters
Business Tools
Scientific Calculators
How It Works
Simple, fast, and transparent
Choose Your Tool
Browse by category or search for the calculator you need. No sign-up required.
Enter Your Data
Input your values directly in your browser. Everything stays on your device.
Get Results Instantly
Calculations happen in real-time with clear explanations of the formulas used.
Our Honest Approach
The truth about ads, data, and how we keep this free
Hi, I'm Aaron—Let's Talk About Ads
Look, I get it. Ads are annoying. If you run an adblocker or decline cookies, I completely understand. Seriously. I appreciate you using the tools either way.
But here's the reality: hosting isn't free, and I'd rather keep these calculators available to everyone than lock them behind a paywall. So I use Media.net for advertising—but I want to be crystal clear about what that means.
What Media.net Actually Does
Media.net serves contextual ads—they look at the page content ("mortgage calculator") and show relevant ads (mortgage offers). Here's what data gets used:
- Basic cookies: Small files that remember you saw an ad, so you don't see it 50 times
- Page context: What calculator you're using (to show relevant ads)
- Anonymous metrics: General stats like "someone clicked this ad" (not "Aaron Smith clicked this")
What they don't do: follow you around the web building a profile, sell your data to data brokers, or track your calculations. Your mortgage numbers, BMI results, or whatever you calculate never leaves your device.
My Commitment
I also use Plausible.io for basic analytics (just page views—no personal data, no cookies). The code is open source on GitHub. And if you decline cookies or block ads? The calculators work exactly the same. I built them to be functional first, monetized second.
Bottom line: I could make more money with aggressive tracking. I could protect privacy better with a subscription. I'm choosing the middle path—free tools, minimal ads, maximum transparency. You decide if that works for you.
Common Questions
Everything you need to know about CalcWise
Yes, completely free. No subscriptions, no hidden fees, no "free trial" nonsense. I built CalcWise to be accessible to everyone. The site runs on minimal advertising (which you can block if you want), and that's enough to keep the lights on.
Nope. No accounts, no emails, no passwords to remember. Just open the calculator you need and start using it. I don't want your personal information—I just want to provide tools that work.
Your calculations: Nothing. All calculations happen in your browser. I never see what you input or what results you get.
Analytics: I use Plausible.io to see basic stats like "100 people visited the mortgage calculator today." No personal data, no cookies, completely anonymous.
Advertising cookies: Media.net uses minimal cookies for ad delivery (frequency capping, basic metrics). You can decline these or use an adblocker—the calculators work either way.
Yes. I use industry-standard formulas and test everything thoroughly. For financial calculators, I provide estimates based on standard calculations—but always consult a professional for major decisions. For math and conversions, the results are mathematically precise. The code is open source on GitHub if you want to verify the formulas yourself.
Absolutely. Every calculator is fully responsive and works on phones, tablets, and desktops. They're built with mobile users in mind—no pinching, zooming, or frustration. Just fast, functional tools wherever you need them.
That's totally fine. I mean it. The calculators are built to work regardless of whether you see ads or not. I'd appreciate the support if you whitelist the site, but I get why people use adblockers. Your choice, no judgment.
Yes. Everything is on GitHub. You can review the code, suggest improvements, report bugs, or fork it for your own projects. Transparency isn't just a buzzword here—it's how I operate.
Just me—Aaron. I'm a developer who got tired of calculator sites that track everything, load slowly, and hide functionality behind paywalls. CalcWise is my answer: fast tools, minimal data collection, maximum transparency. If you have questions or feedback, reach out on the contact page.
Start Calculating
No sign-up, no hassle, no tracking your every move. Just tools that work.
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