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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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GuideA Numerology Chart Shows Seven Numbers and Four InputsLife path, expression, soul urge, personality, birthday, maturity, personal year. Everything comes from a day, a month, a year and a name — and two of the seven are arithmetic restatements of the others, which is worth knowing before reading them as seven separate findings.GuideThe Letter Y Decides Your Soul Urge NumberThe soul urge adds only the vowels, so the entire calculation turns on whether Y is one. Mary Taylor reads 6, 22 or 8 depending on the rule you apply, and every name in a 1,200-name corpus that contains a Y changes when you flip the setting.GuidePythagorean or Chaldean: Two Charts, One Name, Two NumbersThe two letter charts in circulation give the same name the same number only 10.3 % of the time, barely more than the one-in-nine you would get by drawing lots. Albert Einstein is a 9 in one chart and a 1 in the other, and neither reading is a mistake.ExplainerHow Big Will This Puppy Get? The Size Class DecidesThe same 12.7 kg puppy at sixteen weeks predicts a 21.9 kg adult if it is a small breed and 38.5 kg if it is a giant one. The arithmetic is trivial; the class you pick is worth seventy-six per cent.How-ton + 1 Litter Boxes, and What the Litter Actually CostsTwo cats need three boxes, not two, and each should be one and a half body lengths long — 69 cm for an average adult. The litter figure that follows is larger than most people expect, and knowing why is the useful part.How-toThe IATA Crate Formula an Airline Measures at Check-InLength A + half B, width twice C, height D. The width rule is the one that fails people: a dog with 28 cm shoulders needs 56 cm of interior width, and no crate sold by weight rating tells you that.