CalcMonk is a free, fast, and privacy-first collection of 75+ online calculators, generators, and developer tools.
Our Mission
Useful tools should be free and accessible. Whether you need to calculate your loan EMI, compare old vs new tax regimes, decode a JWT token, or generate a professional invoice — CalcMonk gives you instant, accurate results without requiring signup, downloads, or payments.
What We Offer
- Financial Calculators (32) — EMI, SIP, Mutual Fund, NPS, Income Tax, GST, FD, PPF, HRA, Loan Amortization, Capital Gains, Profit Margin, Break-Even, Post Office schemes & more
- Developer Tools (12) — JSON Formatter, Regex Tester, CSS Gradient Generator, Box Shadow, JWT Decoder, Base64 Codec, Cron Generator, Markdown Editor, HTML Minifier & more
- Generators & SEO (11) — Invoice, Payslip, Rent Receipt, Email Signature, Privacy Policy, Meta Tags, Schema Markup, Favicon, Robots.txt, QR Code, Password
- Everyday Tools (20) — Age, BMI, Percentage, Date, Unit Converter, Typing Speed, Pomodoro Timer, Image Compressor, Readability Checker, Tip Calculator, Countdown & more
- Live Data — Gold Rate Today (live from COMEX × USD/INR, updates every 5 min)
How It Works
All calculations run 100% in your browser. No data is sent to any server. Results are instant and private. We use standard, verified formulas and real-time market data where applicable.
Revenue Model
CalcMonk is supported by non-intrusive advertisements. This allows us to keep all tools completely free for users while sustaining development.
Contact
Questions or suggestions? Reach us at hello@calcmonk.com.