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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 formatterFormat, 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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ExplainerThe Same 1,200 Words Run from Seven Minutes to ElevenDelivery speed decides a talk's length more than the script does. At 170 words a minute the same text takes 7 min 04 s; at 110 it takes 10 min 55 s — and only one of those fits a ten-minute slot.ExplainerThree Dice Cluster, and One Die Does Not3d6 and 1d20 have almost the same average and nothing else in common. Against a target of 12 the three dice are better, against 18 they are five times worse — and the calculator gives the exact figures rather than a simulation.ExplainerThe Chinese Gender Chart Says Boy in 57 % of Its Cells336 cells, 192 of them boy and 144 girl. The chart is not even a fair coin, and the real ratio at birth is about 51 % boys — which is the whole measurement this article has to offer.ExplainerThe Same 38 Is Ten Millimetres ApartA women's EU 38 is a 245 mm foot; a men's EU 38 is a 235 mm foot. The printed number is a label, not a measurement — and on the children's US scale it goes backwards, where a 1 is bigger than a 13.ExplainerA Country of 68 Million Needs Fifteen More People Than a Town of 10,000The population barely enters the sample size formula. What does enter it is the margin of error, and halving that margin quadruples the survey — from 385 people to 1,537.How-toOne File per Tab, and What a Split Leaves BehindSplitting a workbook writes one .xlsx per sheet, named after the tab. It carries the values across and not the formulas — which is the right default when the point is to send one department its own tab.