70+ privacy-first, client-side calculators and developer tools built for the Indian market. No login. No tracking. No ads. All calculations run in your browser.
🌐 Live: https://moderncalcs.com
ModernCalcs is a free, open-access utility platform with 70+ specialized tools designed specifically for Indian users and developers. Unlike generic calculator sites, every tool here understands Indian context — ₹ formatting, GST slabs, SIP returns, CIBIL scores, state-wise DISCOM electricity rates, and Indian land units (bigha, gaj, cent).
All calculations are 100% client-side — your financial data, health metrics, and sensitive tokens never leave your browser.
| Tool | URL |
|---|---|
| SIP & Lumpsum Calculator | /finance/sip-calculator |
| Home Loan EMI (Section 80C & 24) | /finance/home-loan-calculator |
| Income Tax AY 2025-26 (New vs Old) | /finance/income-tax-india |
| GST Calculator (5/12/18/28% slabs) | /finance/gst-calculator |
| CTC to In-Hand Salary (PF, PT, HRA) | /finance/salary-calculator |
| CIBIL Score Simulator | /finance/cibil-simulator |
| Gratuity Calculator (Gratuity Act 1972) | /finance/gratuity-calculator |
| Electricity Bill (State DISCOM rates) | /finance/electricity-calculator |
| Land Unit Converter (Bigha/Gaj/Cent) | /finance/land-unit-converter |
| FD Ladder Strategy | /finance/fd-ladder |
| Car & Bike Loan (On-road price builder) | /finance/car-loan-calculator |
| Rent vs Buy (City-wise analysis) | /finance/rent-vs-buy |
| PPF / EPF / NPS Comparison | /finance/retirement-schemes |
| FIRE Calculator | /finance/fire-calculator |
| Education Loan (Section 80E) | /finance/education-loan |
| IT Act Depreciation (WDV method) | /finance/depreciation-calculator |
| Startup Runway Calculator | /finance/runway-calculator |
| Tool | URL |
|---|---|
| JSON Formatter & Validator | /developer/json-formatter |
| JWT Decoder (client-side, token never sent) | /developer/jwt-decoder |
| Regex Tester with live highlights | /developer/regex-tester |
| UUID Generator (v1/v4) | /developer/uuid-generator |
| SQL Formatter & Beautifier | /developer/sql-formatter |
| Base64 Encode / Decode | /developer/base64-tool |
| URL Encode / Decode | /developer/url-encoder |
| Cron Expression Parser | /developer/cron-parser |
| Diff Checker | /developer/diff-checker |
| CSS Converter | /developer/css-converter |
| IP Subnet Calculator | /developer/ip-subnet-calculator |
| Timezone Calculator (IST focus) | /developer/timezone-calculator |
| Bandwidth Calculator | /developer/bandwidth-calculator |
| Tool | URL |
|---|---|
| BMI Calculator (Asian/Indian cut-offs) | /health/bmi-calculator |
| Calorie & TDEE Calculator | /health/calorie-calculator |
| Macro Calculator | /health/macro-calculator |
| Body Fat Calculator | /health/body-fat |
| Ideal Weight Calculator | /health/ideal-weight |
| Tool | URL |
|---|---|
| Tile Calculator | /interior/tile-calculator |
| Paint Estimator | /interior/paint-estimator |
| Flooring Calculator | /interior/flooring-calculator |
| Interior Cost Estimator | /interior/cost-estimator |
| Wallpaper Estimator | /interior/wallpaper-estimator |
| Brick Calculator | /interior/brick-calculator |
| Area Converter | /interior/area-converter |
| Tool | URL |
|---|---|
| Age Calculator + Govt Job Eligibility | /utilities/age-calculator |
| Discount Calculator | /utilities/discount-calculator |
| Password Generator | /utilities/password-generator |
| Sleep Calculator | /utilities/sleep-calculator |
| Date Toolkit | /utilities/date-toolkit |
| Work Hours Calculator | /utilities/work-hours-calculator |
| Heat Index Calculator | /utilities/heat-index-calculator |
| Roman Numeral Converter | /utilities/roman-converter |
| Shoe Size Converter | /utilities/shoe-size-converter |
ModernCalcs is built on a client-side-first architecture:
- ✅ All calculations run in your browser — zero server requests for computation
- ✅ Financial data (salary, loans, tax) never transmitted to any server
- ✅ Developer tokens (JWT, Base64, regex patterns) processed locally only
- ✅ No user accounts, no cookies, no tracking pixels
- ✅ No ads, no popups, no paywalls
| Layer | Technology |
|---|---|
| Framework | Next.js 16 (App Router) |
| Language | TypeScript |
| Styling | Tailwind CSS v4 |
| UI Components | shadcn/ui + Radix UI |
| Charts | Recharts |
| Runtime | React 19 |
| Hosting | Vercel (Edge Network) |
| Fonts | Geist (local, no CDN) |
| Page | URL |
|---|---|
| 🏠 Homepage | https://moderncalcs.com |
| 💰 Finance Hub | https://moderncalcs.com/finance |
| 💻 Developer Tools | https://moderncalcs.com/developer |
| 🏥 Health Hub | https://moderncalcs.com/health |
| 🏠 Interior Hub | https://moderncalcs.com/interior |
| 🔧 Utilities | https://moderncalcs.com/utilities |
| 🗺️ Sitemap | https://moderncalcs.com/sitemap.xml |
| 🔒 Privacy Policy | https://moderncalcs.com/privacy-policy |
Built for India. Runs in your browser. Free forever.