Free Online Tools
Financial calculators, health & fitness tools, developer utilities, unit converters, and PDF tools — all free, fast, and private. Choose a tool suite below to get started.
CalcWise
36 free financial calculators for India, the US & the UK — SIP, EMI, PPF, NPS, tax, GST, EPF, HRA, salary, 401(k), Roth IRA, paycheck, US income tax, student loan, Social Security, ISA, UK income tax, UK mortgage, UK pension, UK student loan, compound interest, mortgage, retirement, FD, RD, CAGR, SWP & more. Visual charts, amortization tables, and CSV export.
36 Calculators Explore CalcWise →DevKit
28+ developer & converter tools — JSON formatter, Base64, JWT decoder, hash generator, regex tester, timestamp converter, password generator, UUID, QR codes, SQL formatter, image compressor, minifiers & more. Everything runs 100% in your browser.
28+ Tools Explore DevKit →UnitSnap
15 free unit converters — length, weight, temperature, speed, volume, area, data storage, fuel efficiency, cooking units, time zones, pressure, energy, power, angle & time duration. Instant conversions, quick-reference grids, and rich educational content.
15 Converters Explore UnitSnap →FitCalc
9 free health & fitness calculators — calorie needs, macro breakdown, body fat %, heart rate zones, ideal weight, water intake, pregnancy due date, calorie burn for 50+ exercises & sleep cycles. Plus 6 in-depth health & fitness guides.
9 Calculators • 6 Guides Explore FitCalc →PDFTools
8 free PDF tools — merge, split, rotate, compress, convert PDF to images, images to PDF, add watermarks & page numbers. Everything runs 100% in your browser — no files are ever uploaded. Plus 5 in-depth PDF guides.
8 Tools • 5 Guides Explore PDFTools →About SarvKit
Free financial calculators, developer tools, and PDF tools — built for everyone.
Our Mission
SarvKit 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, converting units, or working with PDFs, our 110+ 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
CalcWise — Financial Calculators
36 free calculators for India, the US & the UK — SIP, EMI, PPF, NPS, tax, GST, EPF, HRA, salary, 401(k), Roth IRA, paycheck, US income tax, student loan, Social Security, ISA, UK income tax, UK mortgage, UK pension, UK student loan, compound interest, mortgage, retirement, FD, RD, CAGR, SWP, step-up SIP, age, BMI, inflation & credit card payoff. Visual charts, year-by-year tables, and CSV export.
DevKit — Developer Tools
28+ tools including JSON formatter, Base64 encoder/decoder, JWT decoder, hash generator, regex tester, timestamp converter, password generator, UUID, QR codes, SQL formatter, image compressor, JSON-XML converter, minifiers & more.
UnitSnap — Unit Converters
15 free converters for length, weight, temperature, speed, volume, area, data storage, fuel efficiency, cooking units, time zones, pressure, energy, power, angle & time duration. Quick-reference grids, real-world examples, and educational content.
FitCalc — Health & Fitness
9 free health calculators — calorie needs, macro breakdown, body fat %, heart rate zones, ideal weight, water intake, pregnancy due date, calorie burn for 50+ exercises & sleep cycles. Evidence-based formulas.
PDFTools — PDF Tools
8 free PDF tools — merge, split, rotate, compress, convert to images, images to PDF, watermark, and page numbers. All processing happens in your browser. No files uploaded.
100% Private
Everything runs locally in your browser. No data is sent to any server — your financial info and code stay on your device.
Visual Results
Interactive charts, detailed tables, inflation-adjusted projections, and downloadable CSV exports for financial calculators.
Multiple Currencies
Financial calculators support USD, EUR, GBP, INR, JPY, and many more currencies worldwide.
India-Specific Tools
Income Tax (Old vs New regime), GST, EPF, NPS, PPF, SSY, HRA & Gratuity calculators tailored for Indian users.
US-Specific Tools
401(k), Roth IRA, Paycheck, US Income Tax, Student Loan & Social Security calculators with 2026 tax brackets and contribution limits.
Expert Guides
In-depth guides on investing, loans, tax benefits, SIP vs FD, retirement planning, and developer topics like Base64, JWT & regex.
Fast & Lightweight
No frameworks, no bloat. Every tool loads instantly and works on any device — desktop, tablet, or phone.
Our Tool Suites
CalcWise — Investment
SIP • Compound Interest • FD • PPF • EPF • Lump Sum • NPS • RD • SSY • Retirement • CAGR • SWP • Step-Up SIP
CalcWise — Loans
CalcWise — US Finance
401(k) • Roth IRA • Paycheck • US Income Tax • Student Loan • Social Security
CalcWise — UK Finance
ISA • UK Income Tax • UK Mortgage • UK Pension • UK Student Loan
DevKit — Developer Tools
JSON Formatter • Base64 • JWT Decoder • Hash Generator • Regex Tester • Timestamps • Passwords • and more
UnitSnap — Unit Converters
Length • Weight • Temperature • Speed • Volume • Area • Data Storage • Fuel Efficiency • Cooking • Time Zones • Pressure • Energy • Power • Angle • Time Duration
FitCalc — Health & Fitness
Calorie • Macro • Body Fat • Heart Rate • Ideal Weight • Water Intake • Pregnancy • Calorie Burn • Sleep
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
- UnitSnap Guides — 9 guides on metric vs imperial, cooking measurements, data storage, temperature scales, fuel efficiency, time zones, pressure units, energy & power, and angles
Disclaimer
SarvKit 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.
Ready to Get Started?
Explore our free financial calculators and developer tools.
📊 Explore CalcWise 🩺 Explore FitCalc 🛠️ Explore DevKit 📐 Explore UnitSnap