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Roman Numeral ConverterNumbers to Roman numerals and back, plus dates.Average CalculatorMean, median, mode, range and weighted average from any list.Ratio CalculatorSolve A:B = C:?, simplify ratios and scale them.Morse Code TranslatorConvert text and Morse code both ways and play it as sound.Dice RollerRoll 1 to 20 dice of any common type and get the total.Standard Deviation CalculatorSample and population standard deviation with a steps table.Character CounterCount characters, words and sentences, with X, SEO and SMS limits.Time Duration CalculatorTime between two times or dates, and adding or subtracting hours.Unit ConverterMetric and imperial conversions across 8 categories, with exact factors.