All Tools
Browse our complete collection of free online tools. Calculators, converters, generators, and utilities designed for everyday needs.
Complete Collection of Free Online Tools
Welcome to Calcuzy's toolkit featuring 31 free online tools. Whether you're calculating finances, planning projects, managing health, or organizing daily life, our privacy-first platform provides instant results—your calculator inputs stay in your browser.
100% Private
Calculator inputs stay in your browser. We use basic analytics to improve the site.
Lightning Fast
Instant results with optimized performance and no loading delays.
Professional Grade
Built with standard formulas and published guidelines where applicable.
Calculators
Finance Tools
Health & Wellness
Guides & Tutorials
In-depth explainers paired with our calculators—finance, health, and legal topics with formulas, examples, and FAQs.
Capital Gains Tax Guide: Short-Term vs Long-Term Rates
How US capital gains tax works, federal rate differences, and how to estimate tax on a single investment sale.
Crypto Tax Guide: FIFO, LIFO & Cost Basis Explained
US cryptocurrency tax basics, cost basis matching methods, and how to summarize gains and losses.
Will Writing Guide: Basics of a Last Will and Testament
What a will does, essential clauses, state signing rules, and when to consult an estate attorney.
Rent Affordability Guide: The 30% Rule Explained
How much rent you can afford using the 30% guideline, gross income, and monthly expenses.
BMI Calculator Guide: What BMI Means and How to Use It
How Body Mass Index is calculated, WHO/CDC categories, limitations, and when to talk to a doctor.
How to use these tools
Each calculator page includes a short guide: the formula or method used, step-by-step instructions, worked examples, limitations, and links to official references where they exist (IRS publications, WHO/CDC guidance, HUD rent benchmarks, and similar sources). Results are educational starting points—not tax, legal, or medical advice.
Privacy
Calculator inputs run in your browser when possible. We do not require an account. See our Privacy Policy for analytics and advertising disclosures.
Found a bug or need a tool?
Calcuzy is maintained by Akshat Thakur. Send feedback through the contact page—feature requests and corrections are welcome.