Free Online Tools, Instantly

Convert length, weight, temperature, and volume — meters, feet, kg, lbs, °C, °F, liters, gallons, and more

Convert between Celsius, Fahrenheit, and Kelvin instantly

Convert between meters, feet, inches, miles, km, and more

Convert kg, lbs, oz, grams, stones, and more

Convert mph, km/h, m/s, knots, and Mach

Convert HEX color codes to RGB and HSL, or RGB to HEX — with live color preview

Pick any color and get HEX, RGB, HSL, and RGBA values instantly

Calculate percentages, discounts, and percentage changes — X% of Y, % change, and more

Calculate exact age in years, months, and days — plus total days lived and days until next birthday

Calculate your Body Mass Index with metric or imperial units

Calculate tips and split bills between any number of people

Estimate monthly loan payments, total repayment, and interest for any loan

Find the exact number of days, weeks, months, and years between any two dates

Find out what day of the week any date falls on — past, present, or future

Live countdown to any event or deadline in days, hours, minutes, and seconds

Count words, characters, sentences, paragraphs, and reading time — paste any text for instant stats

Convert text to UPPER, lower, Title, Sentence, camelCase, PascalCase, snake_case, and kebab-case

Generate placeholder text by paragraphs, sentences, or words for mockups and prototypes

Convert any title or text into a clean, SEO-friendly URL slug with hyphens

Generate random numbers within any range — one at a time or in bulk, with no-duplicate option

Convert between binary, decimal, hexadecimal, and octal number systems

Reduce any fraction to its lowest terms — shows GCD and decimal equivalent

Check if any number is prime and see its prime factorization and all divisors

Calculate the Greatest Common Divisor and Least Common Multiple of two numbers