Herramientas gratis que simplemente funcionan
Todas las herramientas se ejecutan por completo en tu navegador: sin cuentas, sin subir archivos y sin rastreo. Elige una categoría para empezar.
🕐 Tiempo y fechas
Age Calculator
Free age calculator. Enter your date of birth to see your exact age in years, months and days, your total days lived, and a countdown to your next birthday.
Countdown Timer
Free countdown timer. Enter any future date and see exactly how many days, hours, minutes and seconds remain. Works in your browser, no signup needed.
Day of the Week
Free day of week calculator. Find out what day of the week any date falls on. Check birthdays, historical dates, or any future date instantly.
Days Between Dates
Free days between dates calculator. Find exactly how many days, weeks, and months are between any two dates. Works instantly in your browser.
Leap Year Calculator
Free leap year calculator. Check if any year is a leap year and find the next leap year. Instant results in your browser.
🔢 Matemáticas
Area Calculator
Free area calculator. Calculate the area of rectangles, circles, triangles, squares, and trapezoids. Enter dimensions and get the area instantly in your browser.
Aspect Ratio Calculator
Free aspect ratio calculator. Enter width and height to get the simplified ratio (e.g. 1920×1080 = 16:9) and scale to any new size instantly.
Online Basic Calculator
Free online calculator. Perform addition, subtraction, multiplication, and division. A clean, simple, full-featured basic calculator that works entirely in your browser.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal instantly. Free online base converter with instant results.
Fraction Calculator
Free fraction calculator. Add, subtract, multiply or divide any two fractions and get the simplified result instantly. Also shows the decimal equivalent.
GCD Calculator
Free GCD calculator. Find the Greatest Common Divisor (GCD/GCF/HCF) of any set of numbers. Also shows the LCM. Instant results in your browser.
LCM Calculator
Free LCM calculator. Find the Least Common Multiple (LCM) of any set of numbers. Also shows the GCD. Instant results in your browser.
Octal Number Converter
Free octal converter tool. Instantly convert any number between base 2 (binary), base 8 (octal), base 10 (decimal), and base 16 (hex).
Calculadora de Porcentajes
Calculadora de porcentajes gratis. Halla el porcentaje de un número, qué porcentaje es un valor de otro y calcula el aumento o la disminución porcentual al instante.
💰 Finanzas
50/30/20 Budget Rule Calculator
Free 50/30/20 budget rule calculator. Enter your monthly income to instantly see how much to allocate to needs, wants, and savings.
Compound Interest Calculator
Free compound interest calculator. Enter a principal, interest rate, and time period to see how compound interest grows your investment. Monthly, quarterly, or annual compounding.
Currency Converter
Free currency converter with approximate exchange rates. Convert USD, EUR, GBP, JPY, BRL, and 30+ more currencies instantly in your browser.
Discount Calculator
Free discount calculator. Enter the original price and the discount percentage to instantly see the final sale price and exactly how much you save.
Loan Calculator
Free loan calculator. Enter the loan amount, interest rate, and term to see your monthly payment and total interest paid. Works for mortgages, car loans, and personal loans.
🎲 Sorteos
Coin Flip
Free online coin flip. Tap to flip a fair virtual coin and get heads or tails instantly, with a running tally. Works in your browser, no app needed.
Dice Roller
Free online dice roller. Roll d4, d6, d8, d10, d12, d20, and d100 dice, alone or in groups. Perfect for D&D, tabletop RPGs, and board games. No download needed.
🎮 Juegos y diversión
📝 Texto y palabras
List Alphabetizer
Free online list alphabetizer. Sort any list A-Z, Z-A, by last word, or remove duplicates instantly. Paste your list and click sort.
Backwards Text Generator
Free backwards text generator. Instantly reverse the letters, the word order or the line order of any text in your browser, then copy the result.
Binary Translator
Free binary translator. Convert any text to binary code and decode binary back to text, with full Unicode support, instantly and privately in your browser.
Case Converter
Free online case converter. Instantly change text to UPPERCASE, lowercase, Title Case, Sentence case, aLtErNaTiNg case and small caps in your browser.
Character Counter
Free character counter. Count characters (with and without spaces), words, sentences, paragraphs, and lines in any text. Instant, no signup needed.
Lorem Ipsum Generator
Free Lorem Ipsum generator. Create placeholder dummy text by paragraphs, sentences or words for design mockups and layouts, then copy it in one click.
Morse Code Translator
Free Morse code translator. Convert any text to Morse code dots and dashes, or decode Morse code back to text. Includes audio playback. Works entirely in your browser.
Palindrome Checker
Free palindrome checker. Instantly test whether a word, phrase or number reads the same forwards and backwards, ignoring case, spaces and punctuation.
Contador de Palabras
Contador de palabras gratis en vivo. Pega o escribe texto para contar palabras, caracteres, oraciones, párrafos y tiempo de lectura estimado al instante en tu navegador.
❤️ Salud y cuerpo
Blood Type Compatibility Checker
Free blood type compatibility checker. Select your ABO/Rh blood type to instantly see who you can donate blood to and who you can receive blood from.
Calculadora de IMC
Calculadora de IMC gratis. Introduce tu altura y peso en unidades métricas o imperiales para obtener al instante tu Índice de Masa Corporal y su categoría, en tu navegador.
BMR Calculator
Free BMR calculator. Calculate your Basal Metabolic Rate — the calories your body burns at rest per day. Uses the Mifflin-St Jeor equation.
Food Calorie Calculator
Free calorie calculator. Look up approximate calories per 100g for common foods. Great for diet tracking and meal planning.
Ideal Weight Calculator
Free ideal weight calculator. Find the healthy weight range for your height and sex using the BMI method and the Robinson, Miller, and Devine formulas.
🏠 Hogar y auto
Electricity Cost Calculator
Free electricity cost calculator. Enter an appliance wattage, hours of use per day, and your electricity rate to see daily, monthly, and annual running costs.
Paint Calculator
Free paint calculator. Enter your wall dimensions, number of coats, and paint coverage to calculate exactly how many litres of paint you need.
🔧 Utilidades
Color Picker
Free color picker. Select any color and instantly get its HEX, RGB, and HSL codes. Copy with one click. Works entirely in your browser.
CSS Gradient Generator
Free CSS gradient generator. Create linear and radial gradients with any colors and instantly get the CSS code. No signup needed.