Calculator Dictionary

A complete calculator reference for engineers, students, and everyone else. No sign-up — just calculate.

All Calculators

General Calculators 32

🔢Basic CalculatorA familiar calculator with memory (MC/MR/M+/M-) and square/square root — just like the classic Windows calculator. 🧮Scientific CalculatorA scientific calculator supporting trig, log, powers, roots, nCr/nPr, and more — type naturally or tap the keys. 🎯Percent CalculatorCalculate percentages, ratios, percent change, and discounted prices. 📊Average CalculatorFind the average, median, max, min, and standard deviation of a list of numbers. ⚖️Ratio & Proportion CalculatorSolve proportions (A:B=C:D) and quick ratios (A/B=C) in one place. 🧂Saltwater Concentration CalculatorFind the concentration, salt amount, or resulting concentration after diluting saltwater, with step-by-step solutions. 🍰Fraction CalculatorAdd, subtract, multiply, or divide fractions with visual pie/bar diagrams and step-by-step solutions. 📐Shape Area CalculatorFind the area and perimeter of rectangles, triangles, parallelograms, trapezoids, and circles, with diagrams. 🔢GCD & LCM CalculatorFind the greatest common divisor and least common multiple of two numbers, with prime factorization. 🚗Speed, Distance & Time CalculatorCalculate speed, distance, or time from the other two values. 💯Percent & Discount CalculatorCalculate percentages, rates, and discounted prices with visual 100-box diagrams. 📊Average Calculator (Kids)Find the average of a list of numbers with a simple bar chart visualization. ⚖️Ratio & Proportion Calculator (Kids)Solve for a missing value in a proportion (A:B=C:D) with step-by-step solutions. 🔍Divisors & Multiples CalculatorFind all divisors, multiples, and the prime factorization of a number. ⭕Circle Area & Circumference CalculatorFind a circle's area and circumference from its radius or diameter. 📐Trigonometric Ratios CalculatorFind sine, cosine, and tangent from a right triangle, or convert between degrees and radians with graphs. 📏Pythagorean Theorem CalculatorFind the third side of a right triangle from the other two, with a labeled diagram. 📊Quadratic Equation CalculatorSolve ax²+bx+c=0 using the discriminant and quadratic formula. 🧩Factoring CalculatorFactor a quadratic expression ax²+bx+c over the rationals when possible. √Square Root CalculatorSimplify a square root using prime factorization, with a decimal approximation. 🥧Circular Sector CalculatorFind the arc length and area of a sector from its radius and central angle. 📦Solid Shape Volume & Surface Area CalculatorFind the volume and surface area of a rectangular prism, cylinder, cone, or sphere. 🎲Permutations, Combinations & Probability CalculatorCalculate permutations (nPr), combinations (nCr), and simple probability. 📈Linear Function Graph CalculatorGraph y=ax+b and find its slope, intercepts, and behavior. 📉Variance & Standard Deviation CalculatorFind the mean, median, variance, and standard deviation of a data set. 🔢Exponents & Logarithms CalculatorCalculate powers and logarithms with step-by-step explanations. 🔁Arithmetic & Geometric Sequence CalculatorFind any term and the sum of an arithmetic or geometric sequence. ∂Derivative CalculatorFind the derivative and tangent line slope of a polynomial up to degree 4. ∫Definite Integral CalculatorFind the definite integral (area under the curve) of a polynomial up to degree 4. ➡️Vector CalculatorCalculate 2D vector magnitude, sum, difference, dot product, and angle between vectors. 🔲2x2 Matrix CalculatorFind the determinant, inverse, and trace of a 2x2 matrix. 🔔Normal Distribution CalculatorCalculate the z-score and percentile for a value in a normal distribution.

Everyday Calculators 6

Finance Calculators 1

Unit Converter Calculators 21

📏Length ConverterConvert mm, cm, m, km, inches, feet, yards, and miles instantly. ⚖️Weight ConverterConvert g, kg, tons, ounces, and pounds instantly. 🌡️Temperature ConverterConvert between Celsius, Fahrenheit, and Kelvin instantly. 🧴Volume ConverterConvert mL, L, gallons, cups, pints, and fluid ounces instantly. 📐Area ConverterConvert square meters, square feet, acres, hectares, and pyeong instantly. 💱Currency ConverterConvert USD, KRW, EUR, JPY, CNY, and GBP at live exchange rates. 🚗Speed ConverterConvert m/s, km/h, mph, and knots instantly. 🌪️Pressure ConverterConvert Pa, kPa, MPa, bar, atm, psi, kgf/cm², and mmHg instantly. 💾Data Size ConverterConvert bit, byte, KB, MB, GB, and TB instantly. ⏱️Time ConverterConvert seconds, minutes, hours, days, weeks, and years instantly. ⛽Fuel Economy ConverterConvert km/L, L/100km, and mpg fuel economy figures instantly. 🔌EV Efficiency ConverterConvert km/kWh, Wh/km, kWh/100km, and MPGe electric vehicle efficiency figures instantly. 🔋Energy ConverterConvert J, cal, kcal, Wh, kWh, and BTU instantly. 🧭Angle ConverterConvert degrees, radians, and gradians instantly. 💪Force ConverterConvert N, kgf, lbf, and dyne instantly. 🏎️Power & Horsepower ConverterConvert W, kW, HP, and PS (metric horsepower) instantly. 🧪Density ConverterChoose a mass unit and a volume unit independently to convert density freely. 👟Shoe Size ConverterConvert foot length (mm) to US, UK, and EU shoe sizes, including kids sizes. 👕Korean Clothing Size ConverterConvert Korean clothing sizes to US and EU sizes. 🩸Blood Glucose ConverterConvert blood glucose readings between mg/dL and mmol/L instantly. 🥄Cooking Measurement ConverterConvert teaspoons, tablespoons, and cups to mL/L instantly.

Engineering Calculators 11

Logistics Calculators 6