HDPC

Age Calculator

Find Your Exact Age in Years, Months & Days

Find your exact age down to the day. Enter your date of birth and get your age in years, months, and days — plus total days, total weeks, total months, and a countdown to your next birthday.

Average Calculator

Mean, Median, Mode & Standard Deviation

Paste a list of numbers and instantly get every key statistic: mean, median, mode, range, minimum, maximum, sum, count, and standard deviation. Whether you are grading assignments or analyzing data, this tool does the math.

Base64 Encoder & Decoder

Encode and Decode Base64 Online

Encode plain text to Base64 or decode Base64 strings back to readable text instantly. Handles full UTF-8 Unicode and runs entirely in your browser — ideal for embedding binary data in JSON payloads, email attachments, data URIs, and configuration files.

BMI Calculator

Check Your Body Mass Index Instantly

Check your Body Mass Index quickly. Switch between metric (kg/cm) and imperial (lbs/ft+in) units, enter your weight and height, and get your BMI value, weight category, and healthy weight range instantly.

Case Converter

Change Text to Any Case Instantly

Convert text between uppercase, lowercase, title case, camelCase, snake_case, kebab-case, and more with this free online case converter tool.

Character Counter

Count Letters, Digits & Spaces Online

Count characters, letters, digits, spaces, and special characters in real time. View character frequency analysis with this free online tool.

Color Converter

Convert Between HEX, RGB & HSL Online

Enter a color in any format — HEX, RGB, or HSL — and instantly see it converted to all three representations. A live preview swatch updates in real time, and you can copy any format with a single click.

Compound Interest Calculator

See Your Money Grow Over Time

See how your savings and investments grow over time with compound interest. Enter your principal, interest rate, compounding frequency, and time period — and optionally add monthly contributions to see how regular investing accelerates growth.

Discount Calculator

Find Sale Prices & Savings Instantly

Find out exactly how much you save on any sale. Enter the original price and discount percentage to see the final price, or use reverse mode to figure out what discount percentage was applied.

Fraction Calculator

Add, Subtract, Multiply & Divide Fractions

Enter two fractions, pick an operation, and get the simplified answer instantly — shown as both a fraction and a decimal. Uses the Euclidean algorithm to reduce every result to its simplest form.

JSON Formatter & Validator

Prettify, Minify & Validate JSON Online

Paste raw JSON and instantly format it with clean 2-space indentation, validate its syntax, or minify it for production. Ideal for debugging API responses, cleaning up config files, or preparing JSON for web requests.

Length Converter

Metric & Imperial Unit Conversion

Convert distances and lengths between metric and imperial units in real time. This tool supports millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles — with results updating instantly as you type.

Word Counter

Count Words, Sentences & Reading Time

Count words, characters, sentences, and paragraphs instantly with this free online word counter. Get reading time, speaking time, and average word length stats in real time.

Weight Converter

Metric & Imperial Mass Conversion

Convert between metric and imperial weight (mass) units instantly. Supports milligrams, grams, kilograms, metric tons, ounces, pounds, stone, and US tons — with real-time results as you type.

Volume Converter

Metric, Imperial & Cooking Units

Convert between metric, imperial, US cooking, and cubic volume units in real time. Supports milliliters, liters, US and UK gallons, cups, fluid ounces, tablespoons, teaspoons, and cubic meters, centimeters, feet, and inches.

URL Encoder & Decoder

Encode and Decode URLs Online

Encode special characters in URLs using percent-encoding, or decode percent-encoded URLs back to readable text. Essential for building query strings, constructing API requests, and handling user input with special characters.

Tip Calculator

Split Bills & Calculate Tips Instantly

Calculate the right tip amount in seconds. Enter your bill total, choose a tip percentage, and optionally split the bill among your group. Shows the tip per person, total per person, and the overall amount.

Text Repeater

Repeat Any Text Up to 10,000 Times

Repeat any text up to 10,000 times with custom separators. Free online text repeater tool with real-time output and one-click copy.

Temperature Converter

Celsius, Fahrenheit & Kelvin

Instantly convert temperatures between Celsius (°C), Fahrenheit (°F), and Kelvin (K). Results update in real time as you type — whether you are converting a weather forecast, adjusting a recipe, or solving a physics problem.

Speed Converter

m/s, km/h, mph, Knots, Mach & More

Convert between meters per second, kilometers per hour, miles per hour, knots, feet per second, and Mach with real-time results. Uses the standard atmosphere value for Mach (340.29 m/s at sea level, 15 °C).