All Tools — 119 Tools, One Place
Every calculator, converter and generator on HT99 Tools, organized by category. Use the search below to jump straight to what you need.
Finance Calculators
Loans, mortgages, investments, taxes, and personal finance calculators.
Loan Calculator
Calculate monthly loan payments, total interest, and full amortization schedule.
Open →Mortgage Calculator
Estimate your monthly mortgage payment including principal, interest, taxes and insurance.
Open →EMI Calculator
Compute equated monthly installment for any loan with detailed breakdown.
Open →Compound Interest Calculator
See how investments grow with the power of compounding over time.
Open →Simple Interest Calculator
Calculate simple interest on principal at a fixed rate over time.
Open →Savings Goal Calculator
Find out how much to save monthly to reach any financial goal.
Open →Retirement Calculator
Project your retirement corpus and required monthly contributions.
Open →ROI Calculator
Measure return on investment as a percentage and annualized rate.
Open →APR Calculator
Calculate the annual percentage rate including fees for any loan.
Open →Auto Loan Calculator
Estimate monthly car payments and total cost of financing a vehicle.
Open →Credit Card Payoff Calculator
Calculate how long it takes to pay off credit card debt and total interest.
Open →Income Tax Estimator
Estimate annual income tax liability using standard brackets.
Open →Sales Tax Calculator
Quickly add or extract sales tax from any amount.
Open →Currency Converter
Convert between major world currencies using live exchange rates.
Open →Inflation Calculator
See how inflation erodes purchasing power over time.
Open →Net Worth Calculator
Calculate your net worth by totaling assets minus liabilities.
Open →Health & Fitness
BMI, BMR, calorie, body fat, pregnancy and wellness calculators.
BMI Calculator
Calculate Body Mass Index and understand your healthy weight range.
Open →BMR Calculator
Estimate basal metabolic rate — calories burned at complete rest.
Open →TDEE Calculator
Calculate total daily energy expenditure based on activity level.
Open →Calorie Calculator
Find your daily calorie target for losing, maintaining or gaining weight.
Open →Ideal Weight Calculator
Estimate ideal body weight using Devine, Robinson and Hamwi formulas.
Open →Body Fat Calculator
Estimate body fat percentage using the U.S. Navy method.
Open →Water Intake Calculator
Calculate your daily water requirement based on weight and activity.
Open →Pregnancy Due Date Calculator
Estimate your due date and pregnancy timeline using LMP method.
Open →Ovulation Calculator
Predict your fertile window and ovulation date.
Open →Pregnancy Weight Gain
Track recommended weight gain during pregnancy by trimester.
Open →Heart Rate Zone Calculator
Find your target heart rate zones for cardio training.
Open →Lean Body Mass Calculator
Calculate lean body mass and fat mass breakdown.
Open →Macro Calculator
Compute daily protein, carb and fat targets for your goals.
Open →Math Calculators
Algebra, geometry, statistics, percentages and scientific calculators.
Percentage Calculator
Solve all percentage problems: of, change, increase or decrease.
Open →Scientific Calculator
Advanced scientific calculator with trigonometry, logs and constants.
Open →Fraction Calculator
Add, subtract, multiply and divide fractions with steps.
Open →Quadratic Equation Solver
Solve ax²+bx+c=0 and find real or complex roots.
Open →GCD & LCM Calculator
Find the greatest common divisor and least common multiple of any set.
Open →Prime Factorization
Decompose any integer into its prime factors.
Open →Average Calculator
Compute mean, median, mode, range and standard deviation.
Open →Standard Deviation Calculator
Calculate population and sample standard deviation with variance.
Open →Ratio Calculator
Simplify ratios, scale them and solve proportions.
Open →Exponent Calculator
Raise any base to any power, including negative and fractional exponents.
Open →Logarithm Calculator
Compute logarithms in any base including natural log.
Open →Triangle Calculator
Solve triangles: sides, angles, area, perimeter and type.
Open →Unit Converters
Length, weight, temperature, speed, data and currency converters.
Length Converter
Convert meters, feet, miles, kilometers and more.
Open →Weight Converter
Convert kg, pounds, ounces, stones and tons.
Open →Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin.
Open →Speed Converter
Convert mph, kph, m/s, knots and feet per second.
Open →Area Converter
Convert square meters, acres, hectares and square feet.
Open →Volume Converter
Convert liters, gallons, cups and milliliters.
Open →Data Storage Converter
Convert bytes, KB, MB, GB, TB and petabytes.
Open →Pressure Converter
Convert pascals, bar, psi, atm and mmHg.
Open →Angle Converter
Convert degrees, radians, gradians and turns.
Open →Energy Converter
Convert joules, calories, kWh and BTU.
Open →Time Unit Converter
Convert seconds, minutes, hours, days and years.
Open →Fuel Economy Converter
Convert mpg, km/L and L/100km.
Open →Text & SEO Tools
Word counter, case converter, plagiarism check, readability, keyword density.
Word Counter
Count words, characters, sentences, paragraphs and reading time.
Open →Character Counter
Count characters with and without spaces, plus sentences and lines.
Open →Case Converter
Convert text to UPPER, lower, Title Case, Sentence case or camelCase.
Open →Text Reverser
Reverse text by characters, words or lines.
Open →Remove Duplicate Lines
Clean text by removing duplicate lines and trimming whitespace.
Open →Find and Replace Text
Replace text or regex matches instantly across large documents.
Open →Text to URL Slug
Convert any title into a clean SEO-friendly URL slug.
Open →Keyword Density Checker
Analyze keyword density and frequency in any text.
Open →Readability Checker
Measure readability scores including Flesch-Kincaid and Gunning Fog.
Open →Text Diff Checker
Compare two texts side-by-side and highlight differences.
Open →Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences or words.
Open →Text-to-Handwriting Style
Convert plain text into stylized handwriting-style typography.
Open →Developer Tools
JSON, Base64, hash, regex, URL encoder, CSS & JavaScript minifiers.
JSON Formatter & Validator
Beautify, minify and validate JSON with syntax highlighting.
Open →JSON to CSV Converter
Convert JSON arrays to downloadable CSV format.
Open →Base64 Encode & Decode
Encode text to Base64 or decode Base64 back to text.
Open →URL Encode & Decode
Percent-encode or decode URLs and query parameters.
Open →HTML Entity Encode/Decode
Encode special characters to HTML entities or decode them back.
Open →Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes instantly.
Open →Regex Tester
Test JavaScript regular expressions live with match highlighting.
Open →HTML Minifier
Compress HTML by removing whitespace, comments and line breaks.
Open →CSS Minifier
Minify CSS files by stripping comments and unnecessary whitespace.
Open →JavaScript Minifier
Minify JavaScript code by removing whitespace and comments.
Open →CSS to Inline Styles
Convert CSS rules to inline styles for email templates.
Open →JWT Decoder
Decode and inspect JSON Web Token headers and payloads.
Open →ASCII Table Reference
Browse ASCII characters, codes and HTML entities side-by-side.
Open →Cron Expression Helper
Build and decode cron expressions with human-readable descriptions.
Open →Markdown Preview
Render Markdown into HTML instantly with live preview.
Open →Generators
Password, UUID, QR code, lorem ipsum, color palettes, gradient makers.
Password Generator
Create strong, random, secure passwords with custom rules.
Open →UUID Generator
Generate version 4 UUIDs in single or bulk mode.
Open →QR Code Generator
Create downloadable QR codes for URLs, text, Wi-Fi and more.
Open →Random Number Generator
Generate random numbers within any range, with options for uniqueness.
Open →Random String Generator
Generate random strings for tokens, IDs and keys.
Open →Barcode Generator
Generate Code 128, EAN and UPC barcodes as PNG/SVG.
Open →Test Credit Card Generator
Generate valid-test credit card numbers for developer testing only.
Open →Placeholder Image Generator
Generate placeholder images with custom size, color and text.
Open →CSS Gradient Generator
Design linear, radial and conic CSS gradients visually.
Open →CSS Box Shadow Generator
Create layered box shadows with live preview and CSS code.
Open →Favicon Generator
Convert images into multi-size favicons for web apps.
Open →Signature Generator
Create a personal handwritten-style signature as an image.
Open →Time & Date
Age calculator, date difference, time zone converter, countdown timer.
Age Calculator
Calculate exact age in years, months, days, hours and seconds.
Open →Date Difference Calculator
Find the number of days, weeks, months between two dates.
Open →Add or Subtract Date
Add or subtract days, weeks, months or years from any date.
Open →Countdown Timer Maker
Create a countdown timer to any future date or event.
Open →Time Zone Converter
Convert any time across global time zones instantly.
Open →Weekday Finder
Find the day of the week for any past or future date.
Open →Working Days Calculator
Calculate business days between two dates, excluding weekends and holidays.
Open →Leap Year Checker
Check whether any year is a leap year and learn the rules.
Open →Color & Design
HEX to RGB, color picker, contrast checker, gradient generator.
HEX to RGB Converter
Convert HEX color codes to RGB, HSL and CMYK instantly.
Open →Color Picker
Pick any color and copy it in HEX, RGB, HSL or CMYK format.
Open →Contrast Checker
Verify WCAG color contrast ratios for accessibility compliance.
Open →Color Palette Generator
Generate beautiful color palettes from a base color.
Open →Gradient Palette Maker
Build harmonious gradients for design and UI projects.
Open →CSS Shadow Preview
Preview and copy layered text and box shadows.
Open →Image Color Picker
Extract dominant colors from any uploaded image.
Open →Everyday Utilities
Tip calculator, fuel cost, percentage, random picker, dice roller.
Tip Calculator
Calculate tip and split the bill among any number of people.
Open →Percentage Increase
Calculate percentage increase or decrease between two values.
Open →Random Picker
Pick a random item from your list, with options to remove duplicates.
Open →Dice Roller
Roll dice of any side count, including D&D-style polyhedral dice.
Open →Coin Flip Simulator
Simulate a fair coin toss for heads or tails decisions.
Open →Fuel Cost Calculator
Estimate fuel expenses for any trip distance and vehicle.
Open →Pizza Order Calculator
Determine how many pizzas to order for any group size.
Open →Paint Calculator
Estimate paint quantity needed to cover any room.
Open →Tile Calculator
Calculate the number of tiles needed for floors and walls.
Open →Time Card Calculator
Track work hours, breaks and total pay per period.
Open →GPA Calculator
Calculate your grade point average across courses.
Open →PIN Code Generator
Generate secure numeric PIN codes of any length.
Open →