Converters
Convert colors, units, and number bases instantly in your browser.
Color Converter
Convert colors between HEX, RGB, HSL, and CMYK formats. Live preview with color picker.
Unit Converter
Convert between units of length, weight, temperature, area, volume, speed, and more.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal bases.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates. Show ISO 8601, UTC, local time, and relative time.
YAML to JSON Converter
Convert between YAML and JSON formats. Handles nested objects, arrays, strings, numbers, and booleans.
XML to JSON Converter
Convert XML to JSON format using DOMParser. Handles nested elements, attributes, and text nodes.
CSV Viewer & Editor
Upload or paste CSV data to view as an interactive table. Sort columns, search rows, edit cells, and export.
TOML to JSON Converter
Convert between TOML and JSON formats. Parse TOML sections, key-value pairs, arrays, and nested tables.
PDF to Image Converter
Convert PDF pages to high-quality images. Export as PNG or JPEG with custom resolution.
HTML to PDF Converter
Convert HTML content or web pages to PDF documents. Preserve formatting and styles.
Markdown to PDF Converter
Convert Markdown text to beautifully formatted PDF documents with code highlighting.
HTML to Markdown
Convert HTML to Markdown. Handles headings, lists, links, images, tables, code blocks, and inline formatting.
Date Calculator
Calculate the difference between two dates, add or subtract durations, and find business days. Essential for deadline planning and date math.
Text to Morse Code
Convert text to Morse code and back. Encode letters, numbers, and punctuation. See dot-dash notation and copy the result.
Roman Numeral Converter
Convert numbers to Roman numerals and back. Supports 1–3999. Includes a reference chart for common values.
NATO Phonetic Alphabet
Convert text to the NATO phonetic alphabet (Alpha, Bravo, Charlie...). Useful for spelling out codes, account numbers, and callsigns over the phone.
Percentage Calculator
Calculate percentages, percentage change, and percentage of totals. Covers the most common percentage problems with clear formulas.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine. See all conversions at once and understand the formulas.
Data Size Converter
Convert between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. Supports both SI (decimal) and IEC (binary) prefixes.
Speed Unit Converter
Convert speeds between mph, km/h, m/s, knots, Mach, and the speed of light. Instant all-unit conversion with reference speeds.
Text to Binary
Convert text to binary (0s and 1s) and back. See ASCII/UTF-8 bit representations, hex codes, and decimal values for each character.
Unix Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds. Shows UTC, local time, ISO 8601, and relative time.
Em/Px Converter
Convert between CSS units: px, em, rem, pt, and %. Set your base font size and see all conversions instantly with a quick reference table.
Angle Converter
Convert angles between degrees, radians, gradians, and turns. Includes a unit circle reference and common angle values.
Binary Converter
Convert between binary, octal, decimal, and hexadecimal. Includes text-to-binary encoding and bit grouping for readability.
Aspect Ratio Calculator
Calculate and convert aspect ratios. Enter width and height to simplify ratios, resize proportionally, and compare common standards.
Number to Words
Convert numbers to English words. Supports integers up to 999 quintillion. Perfect for writing checks, invoices, legal documents, and accessibility labels.
Pressure Converter
Convert between all pressure units: Pascal, bar, PSI, atm, torr, mmHg, inHg, and more. Real-time bidirectional conversion with weather and engineering reference values.
Cooking Unit Converter
Convert cooking measurements: cups, tablespoons, teaspoons, ml, liters, ounces, grams. Includes US, metric, and imperial kitchen units for precise recipe scaling.
Ideal Weight Calculator
Calculate ideal body weight range using multiple formulas (Devine, Robinson, Miller, Hamwi). Enter height and biological sex to see recommended weight ranges.
Electricity Cost Calculator
Calculate electricity costs for any appliance or device. Enter wattage, usage hours, and electricity rate to see daily, monthly, and yearly energy costs.
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) and Basal Metabolic Rate (BMR). See daily calorie needs for weight loss, maintenance, and muscle gain.
Sleep Calculator
Calculate optimal bedtimes and wake-up times based on 90-minute sleep cycles. Find the best time to wake up to feel refreshed, or when to go to sleep.
VAT Calculator
Calculate VAT (Value Added Tax) amounts — add VAT to a net price or extract VAT from a gross price. Supports any tax rate including UK, EU, and Australian GST.
ROI Calculator
Calculate Return on Investment (ROI), annualized ROI, and break-even time for any investment. Enter initial investment, final value, and time period.
Discount Calculator
Calculate sale prices, discount amounts, and percentage savings. Find the original price from a sale price, or compute what % discount you're getting.
Markup & Margin Calculator
Calculate markup percentage, gross profit margin, selling price from cost, or cost from selling price. Understand the difference between markup and margin.
Speed Converter
Convert between mph, km/h, m/s, knots, Mach, and more. Instant speed unit conversion with common reference speeds.
Volume Converter
Convert between liters, gallons, milliliters, fluid ounces, cups, pints, quarts, cubic meters, and more. Metric and US/imperial volume units.
Weight Converter
Convert between kilograms, pounds, ounces, grams, stones, metric tons, and more. Instant bidirectional weight and mass unit conversion.
Area Unit Converter
Convert between square meters, square feet, acres, hectares, square kilometers, square miles, and more. Ideal for land area and real estate calculations.
Length Converter
Convert between metric and imperial length units: meters, kilometers, miles, feet, inches, centimeters, millimeters, yards, and more.
Simple Interest Calculator
Calculate simple interest, total amount, and repayment schedule. Enter principal, rate, and time period to see interest earned or owed.
GPA Calculator
Calculate your GPA from letter grades or percentages. Supports standard 4.0 scale, weighted GPA, and semester/cumulative GPA calculation.
Salary Calculator
Convert salary between hourly, weekly, monthly, and annual rates. Account for hours per week, vacation weeks, and see take-home pay estimates.
Retirement Calculator
Project your retirement savings based on current balance, contributions, and expected returns. See if you're on track to retire and how long your savings will last.
Break-Even Calculator
Calculate the break-even point for a product or business. Enter fixed costs, variable cost per unit, and price per unit to find the units and revenue needed to break even.
Savings Goal Calculator
Calculate how long to reach a savings goal, or how much to save per month. Shows month-by-month progress with interest, and time to reach the target.
Debt Payoff Calculator
Calculate how long to pay off debt and total interest paid. Compare avalanche (highest rate first) vs. snowball (smallest balance first) payoff strategies.
Fuel Economy Calculator
Calculate fuel economy (MPG, L/100km), trip fuel cost, and compare vehicle efficiency. Convert between MPG and L/100km, and estimate annual fuel costs.
Inflation Calculator
Calculate the real purchasing power of money over time using historical US CPI data. See what a past dollar amount is worth today, or project future value.
Calorie Calculator
Calculate daily calorie needs (TDEE) based on age, gender, height, weight, and activity level. Shows BMR and calorie targets for weight loss, maintenance, and gain.
Pace Calculator
Calculate running or walking pace, speed, and time. Convert between min/km, min/mile, km/h, and mph. Estimate finish times for 5K, 10K, half marathon, and marathon.
Loan Calculator
Calculate monthly payments, total interest, and amortization schedule for any loan. Enter principal, interest rate, and term to get a full payment breakdown.
BMI Calculator
Calculate Body Mass Index (BMI) from height and weight in metric or imperial units. Shows BMI category, healthy weight range, and context.
Tip Calculator
Calculate tip amount and split the bill among any number of people. Set tip percentage, see per-person totals, and round amounts to the nearest dollar.
Decimal to Fraction Converter
Convert decimals to simplified fractions and mixed numbers. Shows the continued fraction expansion and multiple equivalent representations.
Download Time Calculator
Calculate download time for any file size and internet speed. Convert between bandwidth units (Mbps, MB/s, KB/s) and see how long downloads take at different speeds.
Duration Calculator
Convert time durations between seconds, minutes, hours, days, and weeks. Parse human-readable durations like "2h 30m", format milliseconds, and generate ISO 8601 duration strings.
Ohm's Law Calculator
Calculate voltage, current, resistance, and power using Ohm's Law (V=IR, P=IV). Enter any two values to compute the remaining two with circuit diagrams.
Number Formatter
Format numbers for different locales and styles: decimal, currency, percentage, scientific, and engineering notation. See international number formatting differences.
Statistics Calculator
Calculate mean, median, mode, variance, standard deviation, range, and quartiles from a list of numbers. Instantly understand any dataset.
Compound Interest Calculator
Calculate compound interest with configurable principal, rate, compounding frequency, and time. See year-by-year growth breakdown and total interest earned.
Age Calculator
Calculate your exact age in years, months, days, hours, and minutes from your date of birth. Find the next birthday countdown and age on any specific date.
Date Difference Calculator
Calculate the exact difference between two dates in years, months, weeks, and days. Find business days, add or subtract days from a date, and more.
Number Systems Converter
Convert numbers between binary, octal, decimal, and hexadecimal. Supports integers and shows step-by-step conversion with place values and bit patterns.
Byte Size Converter
Convert between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes. Supports both decimal (SI) and binary (IEC) units (KB vs KiB).
RGB to HEX Converter
Convert colors between RGB, HEX, HSL, and HSB/HSV formats instantly. Color picker with live preview, WCAG contrast checker, and common web color reference.
Morse Code Translator
Translate text to Morse code and Morse code back to text. Supports letters, numbers, and common punctuation with audio playback visualization.
Scientific Notation Converter
Convert numbers between standard form and scientific notation (E notation). Supports very large and very small numbers with configurable significant figures.
Markdown to HTML
Convert Markdown to HTML. Supports headings, bold, italic, links, images, code blocks, blockquotes, lists, tables, and horizontal rules. Shows live preview.
GCD & LCM Calculator
Calculate the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) of two or more numbers. Shows step-by-step Euclidean algorithm.