Unit Converter
Convert length, mass, temperature and volume.
Converters
Convert measurement units, currencies and colors from one format to another instantly.
Tools in Converters
Currency Converter
Convert EUR, USD, GBP, MXN and more with reference rates.
Color Converter
Convert HEX, RGB and HSL with a live preview.
Speed Converter
Convert km/h, mph, m/s and knots instantly.
Digital Storage Converter
Convert GB, MB, TB and binary units (KiB, MiB).
Time Converter
Convert hours, minutes, seconds, days and more.
Roman Numerals Converter
Convert numbers to and from Roman numerals.
Date Difference Calculator
Calculate the days, months and years between two dates.
Numbers to Words
Convert any number to its written form in words, in Spanish or English.
Numeric Base Converter
Convert numbers between bases: binary, octal, decimal, hexadecimal and up to base 36.
Age Calculator
Calculate your exact age in years, months and days, and how many days you have lived.
Character and Word Counter
Count characters, words, letters, numbers and lines of any text instantly.
Timestamp Converter
Convert Unix timestamps to readable dates and times and vice versa.
Date Format Converter
Convert dates between formats: ISO 8601, RFC 2822/3339, Unix, SQL, European, US and custom.
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Articles about Converters
Numeric Bases: Binary, Octal, Decimal and Hexadecimal
What a numeric base is and how binary, octal, decimal and hexadecimal work. Convert between bases with examples, an equivalence table and practical tips.
3 min readHow to Calculate the Difference Between Two Dates (Days, Weeks, Months and Business Days)
Calculate how many days are between two dates, how to count business days, when it is useful (deadlines, vacations, projects) and how to use our tool.
3 min readHow to Calculate the Exact Age in Years, Months and Days
Calculate your exact age in years, months, days, weeks and totals. How real date subtraction works, how leap years matter, and fun facts with examples.
3 min readHow to Convert Numbers to Words: A Quick Guide
Learn how to convert numbers to words for checks, invoices and contracts. See how the conversion works, the differences between Spanish and English, and the tool's limits.
3 min readCharacter and Word Counter: A Practical Text Guide
What a character and word counter counts: characters, words, letters, numbers and lines. Check Twitter, SMS and SEO limits and learn how to use it.
3 min readDate Format Converter: ISO, Unix, RFC, SQL and more
Convert dates between ISO 8601, RFC 2822/3339, Unix timestamp, SQL, EU/US format and custom. Standard tokens. Free.
3 min readRoman Numerals: How to Read and Convert Them (Table 1–3999)
Learn the rules to read and write Roman numerals, the 1–3999 table, the most common mistakes (IIII, VV) and how to convert instantly with our tool.
2 min readWhat is a Timestamp and How to Convert it to Date and Time
Learn what a Unix timestamp is, the difference between seconds and milliseconds, where it is used, and how to convert it to a readable date.
3 min readConvert Celsius to Fahrenheit: Formula, Table and Mental Tricks
Exact formula °F = °C × 9/5 + 32, reference table -40 to 100 °C, 'double and add 30' mental trick for approximations and when to use it.
2 min readConvert Kelvin to Celsius and Fahrenheit: Absolute Zero, Formulas and Uses
Kelvin is the absolute scale. Exact formulas K ↔ °C ↔ °F, table -273 to 1000 K, mental trick and uses in science, lighting (color temp) and cryogenics.
3 min readConvert Kilometers to Miles: Formula, Table and Quick Reference
Exact formula 1 km = 0.621371 mi, table 1–200 km, mental trick 'divide by 1.6' and when to use it. Includes nautical miles and yards.
2 min readConvert Pounds to Kilograms: Formula, Table and Mental Trick for Weight
Exact formula 1 lb = 0.45359237 kg, table 1–300 lbs, mental trick 'divide by 2.2' and body weight, luggage and gym references.
3 min readConvert Liters to Gallons: US, UK, Table and Consumption References
Difference between US gallon (3.785 L) and UK (4.546 L), exact formulas, table 1–200 L, mental trick and references: car tank, fuel economy, drinks, irrigation.
3 min readConvert Euros to Dollars (EUR/USD): Rates, Fees and Best Timing
How the EUR/USD pair works, bank spread vs interbank rate, hidden fees, when to exchange and alternatives (Revolut, Wise, no-fee cards).
3 min readHEX, RGB, HSL and CMYK: Complete Conversion for Design and Print
Convert between HEX, RGB, HSL and CMYK. Understand gamut, color profiles, why CMYK doesn't cover all RGB and how to prepare files for print.
4 min readHEX, RGB and HSL Color Codes: How They Work
Understand the HEX, RGB and HSL color codes used by designers and programmers, learn to read them and convert between them.
3 min readHow to Convert Units of Measurement Correctly
Learn to convert between metres, kilometres, grams, litres and temperatures, with tricks, conversion factors and an online calculator.
3 min read