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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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ExplainerLosing Half Requires Doubling; Losing Ninety Requires TenfoldA 20 % fall needs a 25 % rise to undo. A 50 % fall needs 100 %. An 80 % fall needs 400 %, and a 90 % fall needs 900 %.ExplainerThe Argument About Profit Per Hour Is Always the Denominator$5 000 of profit is $31.25 an hour over 160 hours and $19.23 over 260. Nothing about the business changed — only which hours got counted.ExplainerLeverage Multiplies the Good Year and the Bad One EquallyAssets of $1.2M on equity of $500 000 give a multiplier of 2.4. Cut the equity to $200 000 and it becomes 6 — every point of asset return is now worth six.ExplainerTen Turns a Year Means Your Customers Pay in 37 Days$500 000 of credit sales against $50 000 of receivables gives a turnover of 10 and a collection period of 36.5 days. Double the receivables and it becomes 73.ExplainerAt Six Per Cent, a Promise Thirty Years Out Is Worth a Sixth$1 000 payable in thirty years is worth $174 today at 6 %. At 3 % it is worth $412 — the rate matters more than the wait.ExplainerThree Quarters of a Valuation Comes From Year Six OnwardsA five-year forecast contributes $63M of a $267M enterprise value. The other $204M is the terminal value — the part nobody forecast at all.