Free Online Tools

About Rahul's Tools

Free financial calculators and developer tools — built for everyone.

Our Mission

Rahul's Tools was built with a simple goal: provide free, high-quality tools that anyone can use without sign-ups or paywalls. Whether you're planning your finances, tracking your health, debugging code, converting data formats, or converting units, our 94+ tools are designed to be fast, private, and easy to use.

We believe essential tools should be accessible to everyone. All calculations and conversions happen entirely in your browser — no data ever leaves your device.

What We Offer

Our Tool Suites

Who Is This For?

• Beginners who want to understand how saving and investing works
• Students learning about compound interest, finance, or programming
• Investors planning retirement savings, college funds, or emergency funds
• Home buyers calculating mortgage payments and amortization
• Salaried employees checking EPF, HRA, gratuity, and tax regime benefits
• US workers planning 401(k) contributions, Roth IRA savings, student loan repayment, and Social Security benefits
• Developers formatting JSON, decoding JWTs, testing regex, generating hashes, or converting data
• Health-conscious individuals tracking calories, macros, body fat, heart rate zones, and water intake
• Anyone looking for free, no-sign-up tools that respect their privacy

Our Values

• Free forever: No subscriptions, no sign-ups, no paywalls.
• Privacy first: All operations stay in your browser. We don't collect your data.
• Transparency: We show our formulas and clearly state our tools are not professional advice.
• Accessibility: Designed to work on any device — desktop, tablet, or phone.

Guides & Resources

We publish guides to help you make better decisions and learn new concepts:

• Investment Guide — How to start investing from scratch
• Loan Guide — Strategies to save on loan interest
• Tax Benefits Guide — Maximize deductions under 80C, 80D, HRA & more
• SIP vs FD — Which is better for your goals?
• Best Investment Guide — Top options for every risk appetite
• Retirement Planning — Build a retirement corpus step by step
• NPS Guide — Tier I vs II, tax benefits, and withdrawal rules
• PPF Guide — Interest, EEE tax status, and extension options
• EMI Reduction Guide — Prepayment, balance transfer, and refinancing
• BMI & Health Guide — BMI categories, Asian standards, and healthy weight tips
• SWP Income Guide — Safe withdrawal rates and bucket strategy
• US Retirement Guide — 401(k), Roth IRA, Social Security, and 2026 contribution limits
• Student Loan Guide — Federal rates, repayment plans, PSLF, and payoff strategies
• US Tax Guide 2026 — Federal brackets, deductions, credits, and OBBBA changes
• UK Tax Guide 2025/26 — PAYE bands, National Insurance, personal allowance taper, and tax-saving strategies
• UK Pension & ISA Guide — Workplace pensions, SIPPs, ISAs, Lifetime ISAs, and retirement planning
• Credit Card Debt Guide — How CC interest works, minimum payment trap, avalanche vs snowball, and balance transfer
• Inflation Guide — What causes inflation, CPI measurement, purchasing power erosion, and strategies to beat inflation
• Debt-Free Roadmap — Complete guide to eliminating all debt — inventory, DTI ratio, and payoff strategies
• Developer Blog — 15 articles on Base64, JWT, regex, JSON Schema, Git, Markdown & more
• Nutrition & Calorie Guide — Calories, TDEE, macronutrients, and building a sustainable nutrition plan
• Fitness & Exercise Guide — Heart rate zones, MET values, exercise types, and weekly workout plans
• Body Composition Guide — Body fat %, ideal weight formulas, BMI limitations, and improving body composition
• Sleep Guide — Sleep cycles, stages, circadian rhythm, recommended sleep by age, and tips for better rest
• Pregnancy Health Guide — Trimester milestones, nutrition needs, safe exercises, and prenatal vitamins
• Hydration Guide — Daily water needs, dehydration stages, electrolytes, and practical hydration tips
• UnitKit Guides — 9 guides on metric vs imperial, cooking measurements, data storage, temperature scales, fuel efficiency, time zones, pressure units, energy & power, and angles

Disclaimer

Rahul's Tools is an educational resource. Financial calculator results are mathematical estimates and should not be taken as financial advice. Developer tools are provided as-is for convenience. Always consult qualified professionals for important decisions. See our full Terms of Service and Privacy Policy for details.