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Chemistry
Mole Calculator
Learning & Education · Science & LabEnter a chemical formula and mass or amount of substance. Find molar mass, moles and particle count with an element-by-element breakdown.
Open calculator ↗Dilution Calculator
Science & Lab · Learning & EducationCalculate the stock quantity needed for a target concentration and final batch size. Choose a concentration basis and see dilution factors, steps and batch-size comparisons.
Open calculator ↗Computing
Geometry
Hypotenuse Calculator
Construction & DIY · Learning & EducationFind the diagonal of a right triangle or rectangle. Mix length units and compare 21 unit conversions with a triangle diagram.
Open calculator ↗Circle Calculator
Learning & Education · Construction & DIYFind a circle’s diameter, circumference and area from its radius. Choose regional length units and see a labeled circle and conversion table.
Open calculator ↗Triangle Area Calculator
Learning & Education · Construction & DIYCalculate triangle area from base and perpendicular height or from three side lengths. Mix regional units and follow the area formula with a diagram.
Open calculator ↗Volume and Surface Area Calculator
Construction & DIY · Learning & EducationCalculate the volume and surface area of a box, cylinder, sphere or cone. Mix length units, inspect a dimensioned diagram and compare regional volume units.
Open calculator ↗Scale Calculator
Construction & DIY · Design & Drawing · Learning & EducationFind real length, drawing length or a scale ratio. Mix length units and compare linear, area and volume scale factors with a size diagram.
Open calculator ↗Mathematics
Fraction Calculator
Learning & EducationAdd, subtract, multiply or divide fractions and mixed numbers. Follow exact fraction steps, simplification and a number-line diagram.
Open calculator ↗Quadratic Equation Calculator
Learning & EducationSolve ax² + bx + c = 0, including real, repeated and complex roots. Inspect the discriminant, worked steps and the function graph.
Open calculator ↗Simultaneous Equations Calculator
Learning & EducationSolve two linear equations in x and y. See determinants, substitution checks and the two lines, including parallel or coincident cases.
Open calculator ↗Percentage Calculator
Learning & Education · Shopping · Money ManagementFind a percentage of a value, percentage change, or the percentage represented by a part. See substituted numbers, steps and a number line.
Open calculator ↗Scientific Notation Calculator
Learning & EducationWrite a number in normalized scientific notation, choose significant digits and inspect its coefficient, exponent and rounded decimal value.
Open calculator ↗Statistics Calculator
Learning & Education · Science & LabEnter a list of numbers to calculate mean, median, modes, quartiles, population and sample standard deviation, with a frequency histogram.
Open calculator ↗Binomial Probability Calculator
Learning & EducationCalculate exactly k, at most k and at least k successes in independent trials. Explore the binomial distribution, expected value and standard deviation.
Open calculator ↗Money
Currency Converter
Travel · Shopping · Money ManagementConvert an amount using automatic reference rates or your own exchange rate. Explore a conversion table and rate scenarios.
Open calculator ↗Overseas Shopping Calculator
ShoppingEstimate the total cost of an overseas order, including shipping, service fees and local charges.
Open calculator ↗Multi-Currency Calculator
Travel · Investing · Money ManagementAdd balances in different currencies, including debts. Convert the total and compare a table and currency chart.
Open calculator ↗Stock Profit Calculator
InvestingEstimate share sale profit after fees and optional tax. Separate your original investment from sale proceeds and compare price scenarios.
Open calculator ↗FX Profit Calculator
InvestingCalculate forex position profit or loss for long and short trades, with fees, swap, account-currency conversion and optional tax.
Open calculator ↗Physics
Constant Acceleration Calculator
Learning & Education · Science & LabEnter initial velocity, constant acceleration and time. Find final velocity, signed displacement and total distance, with position and velocity graphs.
Open calculator ↗Density Calculator
Learning & Education · Science & LabFind density, mass or volume from the other two values. Choose international and regional units and inspect the formula and unit-conversion tables.
Open calculator ↗Ohm’s Law Calculator
Learning & Education · Science & LabEnter two electrical quantities to find voltage, current, resistance and power for an ideal DC resistor. Follow the equations and current–voltage graph.
Open calculator ↗Wave Calculator
Learning & Education · Science & LabCalculate wave speed, frequency or wavelength from the other two. Convert units, find the period and view an illustrative normalized wave.
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