Conversion Calculators
Conversion calculators for unit conversion, number bases, Roman numerals and angles. The unit converter shows the factor it used and a conversion chart for the values around yours.
Units and measures
- Unit ConverterA unit converter that works every conversion from the definition, at a precision that matches your input rather than a fixed number of decimals. It doubles as a temperature converter, with the offset Celsius and Fahrenheit need.
- Height Converter: Centimeters to Feet and InchesA height converter from centimeters to feet and inches, and from feet and inches to centimeters: 175 cm is 5 ft 9 in to the nearest inch, or 5 ft 8.9 in to a tenth.
- Degrees Minutes Seconds (DMS) ConverterPaste a coordinate in almost any form into the DMS converter. It says how it read it, converts it to all three notations with exact arithmetic, and tells you how many decimals the input supports.
- Recipe ScalerMultiplying is the easy part. A recipe scaler has to give the answer back as something a measuring cup can hold: ⅛ cup is 2 tbsp, and 1½ eggs needs a decision.
Numbers and words
- Number Base ConverterThis number base converter is exact in every base, including values past 2^53 where a floating-point one quietly loses digits.
- Roman Numeral ConverterThe Roman numeral converter turns numbers into Roman numerals and back, with the work shown and malformed numerals like IIII or IM flagged.
- Number to Words ConverterThe number to words converter writes any number out exactly, to 66 digits, reading three digits at a time. It also gives the form a check needs and the ordinal.
More categories
- Math CalculatorsMath calculators that show their work: arithmetic, algebra, statistics, and a calculus calculator for derivatives and integrals, with exact answers in fractions and radicals where they exist.
- Geometry CalculatorsGeometry calculators for shapes, lines and angles, with the formula behind each answer explained.
- Chemistry Calculators, Physics and Lab ToolsChemistry calculators, physics calculators and molecular biology tools for the bench and the problem set.
- Date and Time CalculatorsDate and time calculators for counting days, adding hours, converting time zones and reading other calendars.
- Business CalculatorsBusiness calculators for pricing a product and for the unit economics behind a company: margin, markup, break-even, ROI, CAC, LTV and churn.
- Random GeneratorsRandom generators that draw fairly, from your browser's cryptographic generator: numbers, names, teams, coin flips and dice.
- Everyday Cost CalculatorsCost calculators for what a meal, a drive or an appliance actually costs: tips, split bills, fuel, electricity and EV charging.
- Free Online ToolsFree online tools for codes and text, run in your browser with nothing uploaded.