Education & Culture

Morse Code Translator Translate text to Morse code and back — and play it as sound in your browser. NATO Phonetic Alphabet Translator Spell any text as Alfa, Bravo, Charlie with the official NATO/ICAO alphabet — in your browser. Palindrome Checker Check if a word or phrase is a palindrome — ignoring case, accents and punctuation, in your browser. What Day of the Week Was It? Find the day of the week of any date from 1583 to 9999, with day of the year, ISO week and leap-year facts. Weighted Average Calculator Average values that carry different weights — and find the grade you need on the next test. LCM & GCD Calculator Find the least common multiple and the greatest common divisor of any list of whole numbers, step by step. Factorial, Permutation & Combination Calculator Work out n!, arrangements, combinations and anagram counts exactly, with every step shown in your browser. Fraction Calculator & Simplifier Reduce any fraction to lowest terms and add, subtract, multiply or divide two fractions — with the GCD and the LCM shown. Fraction ↔ Decimal Converter Turn a fraction into a decimal — repeating period included — and any decimal back into an exact fraction. Scientific Notation Converter Convert any number to scientific and engineering notation, and back again, with significant figures counted. Prime Number Checker & Factorizer Check whether a number is prime, break it into prime factors, list every prime up to N and find the next one. Pythagorean Theorem Calculator Find the hypotenuse or a missing leg of a right triangle, with every step of the calculation shown. Area & Perimeter Calculator Area and perimeter of squares, rectangles, triangles, circles, trapezoids and rhombuses, with the formula applied to your numbers. Volume Calculator Volume of cubes, boxes, spheres, cylinders, cones and pyramids — plus surface area where it is direct — in your browser. Angle Converter Convert degrees, radians, gradians and degrees-minutes-seconds, with the sine, cosine and tangent of the angle. Multiplication Table Times table for any number from 1 to 100, a clickable 1-10 grid and a practice mode with a session score. Roman Numeral Converter Convert numbers to Roman numerals and back, with strict validation and a step-by-step breakdown. Portuguese Syllable Separator Type a word in Portuguese and see its syllable separation — with classification as monosyllable, disyllable, trisyllable or polysyllable. Typing Speed Test Measure your typing speed in words per minute (WPM) and accuracy — with texts in Portuguese, English and Spanish. Molar Mass Calculator Type a chemical formula and get the molar mass in g/mol, with the contribution of each element — using IUPAC 2021 atomic weights. Zodiac Sign Lookup Type a date of birth and see the zodiac sign, the date range, the element, the quality and a brief description. Numerology Calculator Type your full name and date of birth to see the life path, expression, soul urge and personality numbers in the Pythagorean system. Rising Sign Calculator Estimate your rising sign (ascendant) from your date and time of birth — a simplified solar-time calculation. Simplified Birth Chart See your sun, moon and rising signs with element balance — a simplified astrology chart from your birth date. Daily Tarot Draw Draw one or three cards from the 78-card Rider-Waite deck — with upright and reversed meanings for reflection. Quadratic Equation Solver Solve ax² + bx + c = 0 — see the discriminant, the roots and whether they are real or complex. Matrix Calculator Compute the determinant, transpose or inverse of a matrix up to 10×10 — with step-by-step results. Function Plotter Type a mathematical function and see its graph plotted on an interactive canvas with axes and grid. Cardinal Points Reference The 16 compass points with their abbreviations, degrees and full names — type a bearing to find the closest direction. Average Speed Calculator Calculate speed, distance or time from any two of the three — type two and the third is computed. Free Fall Calculator Calculate how long an object takes to fall from a given height, or how far it falls in a given time — with final velocity. Kinetic & Potential Energy Calculator Calculate kinetic energy from mass and velocity, potential energy from mass and height, or both at once. Ohm's Law Calculator Fill in any two of voltage, current, resistance and power — the other two are calculated instantly. Weight on Other Planets See how much you would weigh on the Moon, Mars, Jupiter and every planet in the solar system. Dilution Calculator (C₁V₁ = C₂V₂) Solve the dilution equation for any unknown — concentration or volume — in one step. pH Calculator Enter pH, pOH, [H⁺] or [OH⁻] and see the other three instantly — at 25 °C. Chemical Equation Balancer Type a chemical equation and get the balanced version with the smallest whole-number coefficients. Resistor Color Code Calculator Select the color bands on a resistor to read its resistance and tolerance — or find the colors for a known value. Movable Dates Calculator Find Carnival, Easter, Corpus Christi, Mother's Day and other movable dates for any year. What Is My Zodiac Sign? Type your birth date to find your Western zodiac sign — with dates, element and quality. Chinese Zodiac Sign Enter your birth year to find your Chinese zodiac animal — with element and personality traits. Speed Reading Trainer Paste text and read it word by word at an adjustable speed in words per minute.