All Tools — 20+

Free · Browser-only · No login

Finance Credit Card Payoff Calculator Find your debt-free date
Finance Savings Goal Calculator Plan monthly savings targets
Finance Florida Alimony Calculator Based on 2023 FL guidelines
Finance Mercedes Lease Calculator Accurate monthly payments
Finance CAR Calculator Cumulative Abnormal Return
Health Water Intake Calculator Daily hydration recommendation
Construction HVAC System Cost Calculator Full install & replacement cost
Construction AC Replacement Cost Calculator Air conditioner cost estimator
Construction Furnace Replacement Cost Calculator Estimate heating replacement cost
Construction Pine Straw Calculator Coverage & bale quantity
YouTube YouTube Tag Extractor Extract hidden video tags
YouTube YouTube Comment Picker Random giveaway winner selector
YouTube YouTube Thumbnail Downloader HD thumbnail in one click
YouTube YouTube Video Stats Checker Views, likes, engagement data
YouTube Instagram Reels Downloader Save reels without watermark
AI ChatGPT Token Counter Count tokens before API calls
AI Claude Token Counter Token count for Claude API
Math GCF Calculator Greatest Common Factor finder
More More tools added every week — bookmark this page ↑ new

100%

Browser-only calculations.
Zero data sent to any server.

0

Sign-ups required.
No account, no email, nothing.

∞

Uses per tool, per person.
No rate limits, ever.

✓

Formula-verified against
authoritative sources only.

Questions

Are all tools on Calcxi completely free? +

Yes — every single tool is free with no sign-up, no premium tier, and no paywalls. We earn revenue through ads, which keeps everything free for users indefinitely.

Does Calcxi store the numbers I enter? +

No. All calculations happen entirely inside your browser. Nothing is transmitted to our servers. Your financial data, health figures, and any other inputs stay 100% on your device.

How do I know the results are accurate? +

Every formula is sourced from authoritative references — IRS guidelines, NIH research, ASHRAE standards, state statutes, and similar. Our accuracy policy documents the verification process, and each tool shows a "Last Updated" date.

Can I request a new calculator? +

Absolutely. Use the contact page or email support@calcxi.com with your suggestion. Most new tools come directly from user requests.

Do tools work on mobile? +

Yes. Every tool is responsive and tested on smartphones and tablets. Input fields trigger numeric keypads automatically on touch devices.