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Percentage calculatorFour percentage calculations in one: X% of Y, what percent X is of Y, and increasing or decreasing a value by a percentage.Average (mean) calculatorCompute the mean, sum and count of a list of numbers.Derivative CalculatorCompute single, partial, implicit and directional derivatives symbolically.Percentile calculatorFind the value at a given percentile in a list of numbers.CalculatorEvaluate math expressions with parentheses, powers and modulo, live.3D Distance CalculatorCompute the distance between two points in space, with an isometric view, the Δx / Δy / Δz components and the midpoint.Absolute Value Equation SolverSolve absolute-value equations like |x+3| = 5, 3|x+2| = 12 or |x+1| = |x−3| with step-by-step case analysis and exact solutions.Absolute Value Inequality SolverSolve absolute-value inequalities such as |x+3| < 5 or |x−2| > 3 and get the solution as an interval, with AND/OR reasoning explained step by step.
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BMI calculatorCompute your Body Mass Index and weight category.VAT calculatorAdd or remove VAT from a price at any rate.Temperature converterConvert between °C, °F, K and more. Free temperature converter, instant and accurate.QR Code GeneratorCreate a QR code from any text or URL — free.Password generatorGenerate a strong, random password — free and secure.Word counterCount words, characters, sentences and reading time instantly.Hash generatorCompute 15 hashes (MD5, SHA-256, SHA-3, CRC-32…) of a text or a file.UUID generatorGenerate UUID v7, v4, v5, v3, v1 or v6 in bulk, in several output formats.Base64 Encoder / DecoderEncode and decode Base64 online — free.JSON formatter, minifier and validatorFormat, beautify or minify JSON — with instant validation.Color converterConvert a colour to HEX, RGB, HSL, HSV, CMYK, LAB and OKLCH, with contrast.Regex testerTest a regular expression and see what it does: matches highlighted in the text, every capture group listed, a replace panel, and the pattern read back to you piece by piece. Flags are toggles that say what they change, and a pattern that could freeze the page is flagged before you run it.
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ExplainerAn Ellipse Has a Simple Area and No Simple PerimeterSemi-axes 5 and 3 give a perimeter of 25.5270, and the exact value differs by one part in two million. The obvious guess, π(a+b), is 1.5 % low — and 15 % low on a long thin ellipse.ExplainerA Polygon's Diagonals Are a Full Mesh Minus the PerimeterA hexagon has 9 diagonals, a twenty-sided figure has 170 and a hundred-sided one has 4,850. The same counting gives the link count of a full-mesh network: 190 links for 20 nodes, 4,950 for 100.ExplainerSixty Metres of Fence Encloses More Ground the Rounder You Make ItThe same 60 m of fence gives 173 m² as a triangle, 225 as a square, 260 as a hexagon and 286 as a circle. The shape is worth 65 % more than the material.ExplainerOne Formula Covers the Sphere, the Egg and the PlanetFour thirds π times the three semi-axes: 5, 3 and 4 give 251.33, and setting all three equal gives the sphere back. Earth's equatorial bulge costs it 0.34 % of a sphere's volume.ExplainerThe Outer Tenth of a Disc Is a Fifth of Its AreaA ring from radius 9 to 10 covers 59.7 square units of a 314.2 disc — 19 %, from a rim one tenth as wide as the radius. A 60 mm pipe with a 3 mm wall obeys the same arithmetic.ExplainerA Twenty-Gallon Tank Holds Sixteen Gallons in Britain60 × 30 × 40 cm is 72 litres — 19.0 US gallons or 15.8 imperial ones. The two gallons differ by 20 %, and filling 5 cm short costs another 9 litres.