# Tejji — Full Tool Reference > Free online tools — calculators, converters, IP tools, time/date utilities, and more. > No sign-up required. All tools run client-side for privacy. > This is the detailed version. See [/llms.txt](/llms.txt) for the concise version. --- ## Finance Tools ### Mortgage Calculator - **URL**: /apps/mortgage-calculator - **What it does**: Calculates monthly mortgage payments given loan amount, interest rate, and loan term. Shows full amortization schedule with principal/interest breakdown. - **Inputs**: Loan amount (USD), annual interest rate (%), loan term (years) - **Output**: Monthly payment, total interest, total cost, amortization table - **Example query**: "What is the monthly payment on a $300,000 mortgage at 6.5% for 30 years?" - **Slug pages**: /apps/mortgage-calculator/300000-6.5-30 ### Loan EMI Calculator - **URL**: /apps/loan-emi-calculator - **What it does**: Calculates Equated Monthly Installment (EMI) for any loan. Common in India and Asia. Shows amortization schedule with pie chart. - **Inputs**: Principal amount, annual interest rate (%), tenure (months) - **Output**: EMI amount, total interest, total payment, amortization schedule - **Example query**: "What is the EMI for a ₹10 lakh loan at 8.5% for 5 years?" ### Compound Interest Calculator - **URL**: /apps/compound-interest-calculator - **What it does**: Calculates compound interest with optional monthly contributions. Shows growth chart over time. - **Inputs**: Principal, annual rate, years, monthly contribution, compounding frequency - **Output**: Future value, total contributions, total interest earned, growth chart ### Investment Calculator - **URL**: /apps/investment-calculator - **What it does**: Calculates returns for both SIP (Systematic Investment Plan) and lump sum investments. - **Inputs**: Investment amount, expected return rate, investment period - **Output**: Maturity value, total investment, wealth gained ### Retirement Calculator - **URL**: /apps/retirement-calculator - **What it does**: Projects retirement corpus based on current savings, contributions, and expected returns. Uses 4% safe withdrawal rule. - **Inputs**: Current age, retirement age, current savings, monthly contribution, expected return, inflation rate - **Output**: Retirement corpus, safe annual withdrawal, monthly income in retirement ### Future Value Calculator - **URL**: /apps/future-value-calculator - **What it does**: Calculates the future value of a present sum at a given interest rate. - **Inputs**: Present value, annual interest rate, number of years - **Output**: Future value ### NPV Calculator - **URL**: /apps/net-present-value-calculator - **What it does**: Calculates Net Present Value of a series of future cash flows. - **Inputs**: Discount rate, initial investment, cash flows per period - **Output**: NPV, IRR ### Inflation Calculator - **URL**: /apps/inflation-calculator - **What it does**: Shows how inflation changes purchasing power over time using historical CPI data. - **Inputs**: Amount, start year, end year - **Output**: Adjusted amount, cumulative inflation percentage ### Salary Calculator - **URL**: /apps/salary-calculator - **What it does**: Converts salary between hourly, weekly, biweekly, monthly, and annual amounts. - **Inputs**: Amount, from period, to period - **Output**: Equivalent salary in target period ### Tax Calculator - **URL**: /apps/tax-calculator - **What it does**: Calculates 2024 US federal income tax with bracket breakdown. - **Inputs**: Gross income, filing status, deductions - **Output**: Effective tax rate, marginal rate, tax by bracket, take-home pay ### Sales Tax Calculator - **URL**: /apps/sales-tax-calculator - **What it does**: Calculates sales tax for any US state, showing combined state + local rates. - **Inputs**: Purchase amount, state - **Output**: Tax amount, total with tax, state rate, combined rate ### Tip Calculator - **URL**: /apps/tip-calculator - **What it does**: Calculates tip amount and splits the bill among multiple people. - **Inputs**: Bill amount, tip percentage, number of people - **Output**: Tip amount, total bill, per-person amount ### Percentage Calculator - **URL**: /apps/percentage-calculator - **What it does**: Three modes — "What is X% of Y", "X is what % of Y", "% change from X to Y". - **Inputs**: Two numbers and calculation mode - **Output**: Result with formula shown ### APR to APY Converter - **URL**: /apps/apr-to-apy - **What it does**: Converts Annual Percentage Rate to Annual Percentage Yield based on compounding frequency. - **Inputs**: APR (%), compounding frequency - **Output**: APY (%) ### Money Converter - **URL**: /apps/money-converter - **What it does**: Converts between world currencies using live exchange rates. - **Inputs**: Amount, from currency, to currency - **Output**: Converted amount, exchange rate ### Send Money Comparison - **URL**: /apps/send-money - **What it does**: Compares exchange rates and fees across international money transfer providers (Wise, Remitly, etc.). - **Inputs**: Amount, from country, to country - **Output**: Provider comparison table with rates, fees, speed --- ## Math & Science Tools ### Calculator - **URL**: /apps/calculator - **What it does**: Basic and scientific calculator with history. Supports standard arithmetic and scientific functions. - **Inputs**: Mathematical expression - **Output**: Result, calculation history ### Pythagorean Theorem Calculator - **URL**: /apps/pythagoras-theorem - **What it does**: Finds the missing side of a right triangle given two sides. - **Inputs**: Two sides (a, b, or c) - **Output**: Missing side, angles, area, step-by-step solution ### Roman Numeral Converter - **URL**: /apps/roman-numeral-converter - **What it does**: Converts between Arabic numbers and Roman numerals. Includes quiz mode. - **Inputs**: Number or Roman numeral - **Output**: Converted value with breakdown --- ## Health Tools ### BMI Calculator - **URL**: /apps/bmi-calculator - **What it does**: Calculates Body Mass Index. Supports imperial and metric units. - **Inputs**: Weight (kg or lbs), height (cm or ft/in) - **Output**: BMI value, category (underweight/normal/overweight/obese), BMI prime ### Body Fat Calculator - **URL**: /apps/body-fat-calculator - **What it does**: Estimates body fat percentage using the US Navy circumference method. - **Inputs**: Gender, height, waist, neck, hips (women only) - **Output**: Body fat %, fat mass, lean mass, category ### Calorie Calculator - **URL**: /apps/calorie-calculator - **What it does**: Calculates daily calorie needs based on BMR (Mifflin-St Jeor) and activity level. - **Inputs**: Age, gender, weight, height, activity level, goal - **Output**: BMR, TDEE, recommended calories, macronutrient split --- ## Unit Converters All converters work instantly with no page reload. Enter a value and the result appears immediately. ### Temperature Conversion - **URL**: /convert/temperature-conversion - **Units**: Celsius, Fahrenheit, Kelvin, Rankine, Réaumur - **Example**: "Convert 100 degrees Celsius to Fahrenheit" → 212°F - **Slug pages**: /convert/temperature-conversion/100-celsius-to-fahrenheit ### Length Conversion - **URL**: /convert/length-conversion - **Units**: Meter, kilometer, mile, yard, foot, inch, centimeter, millimeter, nautical mile - **Example**: "How many feet in 1 meter?" → 3.28084 ft ### Mass/Weight Conversion - **URL**: /convert/mass-conversion - **Units**: Kilogram, pound, ounce, gram, stone, ton (metric/US/UK) - **Example**: "Convert 75 kg to pounds" → 165.347 lbs ### Speed Conversion - **URL**: /convert/speed-conversion - **Units**: km/h, mph, m/s, knots, Mach - **Example**: "100 kph in mph" → 62.137 mph ### Bytes/Data Conversion - **URL**: /convert/bytes-conversion - **Units**: Byte, KB, MB, GB, TB, PB (binary and decimal) ### Number System Conversion - **URL**: /convert/number-conversion - **Systems**: Decimal, Binary, Octal, Hexadecimal ### Angle Conversion - **URL**: /convert/angle-conversion - **Units**: Degrees, radians, gradians, arcminutes, arcseconds ### Astronomical Conversion - **URL**: /convert/astronomical-conversion - **Units**: Light year, parsec, astronomical unit, kilometer, mile ### Frequency Conversion - **URL**: /convert/frequency-conversion - **Units**: Hertz, kHz, MHz, GHz, RPM ### Mileage/Fuel Conversion - **URL**: /convert/mileage-conversion - **Units**: MPG (US), MPG (UK), km/L, L/100km ### Metric Prefix Converters - Length metric: /convert/length-metric-conversion — all SI length prefixes - Mass metric: /convert/mass-metric-conversion — all SI mass prefixes - General metric: /convert/metric-conversion — common metric↔imperial --- ## IP & Network Tools ### My IP Address - **URL**: /ip/my-ip-address - **What it does**: Shows your public IP address as seen by servers, with geolocation data from MaxMind GeoLite2. ### IP to Location - **URL**: /ip/ip-to-location - **What it does**: Geolocates any IP address showing city, region, country, ISP, coordinates on a map. - **Slug pages**: /ip/ip-to-location/8.8.8.8 ### DNS Lookup - **URL**: /ip/dns-lookup - **What it does**: Queries DNS records (A, AAAA, MX, NS, TXT, CNAME) for any domain. - **Slug pages**: /ip/dns-lookup/google.com ### WHOIS Lookup - **URL**: /ip/whois-lookup - **What it does**: Retrieves domain registration information via WHOIS protocol. - **Slug pages**: /ip/whois-lookup/google.com ### URL to IP Address - **URL**: /ip/url-to-ip-address - **What it does**: Resolves a domain name to its IP address(es). ### IP Address to URL - **URL**: /ip/ip-address-to-url - **What it does**: Performs reverse DNS lookup to find hostnames for an IP. ### Bulk IP Lookup - **URL**: /ip/bulk-ip-lookup - **What it does**: Look up geolocation data for multiple IP addresses at once. ### IP to Number - **URL**: /ip/ip-to-number - **What it does**: Converts IPv4 dotted-decimal to 32-bit integer and vice versa. ### IPv4 to IPv6 - **URL**: /ip/ipv4-to-ipv6-conversion - **What it does**: Converts IPv4 addresses to IPv6 mapped format. ### Subnet Calculator - **URL**: /ip/subnet-calculator - **What it does**: Calculates network address, broadcast, host range from CIDR notation. ### IP Blacklist Check - **URL**: /ip/ip-blacklist-check - **What it does**: Checks if an IP is listed on common DNS blacklists (DNSBL). --- ## Time & Date Tools ### World Clock - **URL**: /time-date/world-clock - **What it does**: Shows current time across multiple cities with interactive time-bar visualization. Drag cities to reorder, set home city for offset calculation, day/night indicators. - **Slug pages**: /time-date/world-clock/london, /time-date/world-clock/tokyo ### Current Time - **URL**: /time-date/current-time - **What it does**: Shows current time in any city worldwide with timezone details. - **Slug pages**: /time-date/current-time/new-york ### Time Zone Conversion - **URL**: /time-date/time-conversion - **What it does**: Converts time between different time zones. - **Slug pages**: /time-date/time-conversion/est-to-pst --- ## Visa & Immigration Tools ### H1B Visa Data - **URL**: /visa/h1b - **What it does**: Search and browse H1B LCA (Labor Condition Application) data filed with USCIS. Filter by company, job title, year. ### H1B Sponsors - **URL**: /visa/h1b-sponsors - **What it does**: Search for companies that sponsor H1B visas. See filing counts, approval rates. - **Slug pages**: /visa/h1b-sponsors/google, /visa/h1b-sponsors/microsoft ### H1B Salary Data - **URL**: /visa/h1b-salary - **What it does**: View H1B salary data by job title with percentile distribution. - **Slug pages**: /visa/h1b-salary/software-engineer ### H1B Trends - **URL**: /visa/h1b-trends - **What it does**: Visualize H1B filing trends over time with charts. ### H1B Compare - **URL**: /visa/h1b-compare - **What it does**: Compare H1B sponsors side by side — filings, salaries, approval rates. --- ## Postal Code Tools ### ZIP Codes Worldwide - **URL**: /zip-codes - **What it does**: Search postal codes for cities globally. ### India Pincode Finder - **URL**: /zip-codes/pincode-finder - **What it does**: Search and browse Indian postal codes (PIN codes) by city, district, or state. ### US ZIP Code Pages (155,000+ pages) - **URL**: /zip-codes/us/{zip} - **What it does**: Detailed page for each US ZIP code with city, county, state, coordinates, and nearby codes. - **Example**: /zip-codes/us/10001 — New York, NY ### India PIN Code Pages (41,000+ pages) - **URL**: /zip-codes/india/{pin} - **What it does**: Detailed page for each India PIN code with post office, district, state, and nearby codes. - **Example**: /zip-codes/india/110001 — New Delhi --- ## Developer Tools ### JSON Formatter - **URL**: /apps/json-formatter - **What it does**: Formats, validates, and beautifies JSON data with syntax highlighting and error reporting. ### Regex Tester - **URL**: /apps/regex-tester - **What it does**: Tests regular expressions in real-time with match highlighting. Shows capture groups. ### Hash Generator - **URL**: /apps/hash-generator - **What it does**: Generates cryptographic hashes (MD5, SHA-1, SHA-256, SHA-512) from text or files. ### UUID Generator - **URL**: /apps/uuid-generator - **What it does**: Generates random UUID v4 strings. Batch mode for multiple UUIDs. Validates existing UUIDs. ### Timestamp Converter - **URL**: /apps/timestamp-converter - **What it does**: Converts between Unix timestamps and human-readable dates. Shows live clock. ### Base64 Encoder/Decoder - **URL**: /apps/encode-decode-base64 - **What it does**: Encodes and decodes Base64 strings with full Unicode support. ### QR Code Generator - **URL**: /apps/qr-code-generator - **What it does**: Generates QR codes for URLs, text, and other data. Download as PNG. --- ## API Endpoints ### City Search API - **Endpoint**: `GET /api/location/cities?q={query}` - **Description**: Search ~80,000 cities worldwide by name. Returns city name, country, timezone, coordinates. - **Rate limit**: No authentication required. Reasonable use expected. - **Response**: JSON array of city objects --- ## Technical Details - **Stack**: ASP.NET Core, Vanilla TypeScript, Vite - **Calculations**: All client-side (no server round-trips) - **Privacy**: No user data stored or transmitted - **PWA**: Installable as Progressive Web App - **Accessibility**: Keyboard navigable, screen reader compatible - **Mobile**: Responsive design, works on all screen sizes ## Links - Concise version: [/llms.txt](/llms.txt) - Sitemap: [/sitemap.xml](/sitemap.xml) - Contact: [/home/contact](/home/contact)