Conversions
Conversions: Length, weight, volume, temperature. Free, simple calculators with no sign-up.
Conversions
- Unit converterLength, weight, volume and temperature: switch from one unit to another.
- Height: cm to feet and inches, and adult height estimateConvert a height between cm and feet-inches, or estimate a child’s adult height.
- Bra size calculator: EU, FR, UK and US sizesFind your bra size from two measurements, and the matching size in each country.
- Fuel economy converter: L/100 km, MPG and km/LConvert fuel economy between L/100 km, miles per gallon (US and UK) and km/L, or work it out after a trip.
- Power converter: kW, hp, PS, W, BTU/hConvert power between watts, kilowatts, metric horsepower (PS), mechanical horsepower (hp), BTU/h and kcal/h.
- Shoe size converter: EU, UK, US from foot lengthFind an indicative shoe size in Europe, the UK and the US from your foot length.
- Roman numerals converterTurn a number into Roman numerals (2026 → MMXXVI) or Roman numerals into a number, from 1 to 3,999.
- Base64 encoder and decoderEncode text to Base64 or decode Base64 back to text (UTF-8), with the URL-safe variant if needed.
- URL encoder and decoderEncode text for a URL (%20, %C3%A9…) or decode an encoded URL, as a single value or a full URL.
- Punycode converterEncode an international domain name to Punycode or decode it, on its own or inside a URL.
- Density calculatorThe density of an object or liquid from its mass and its volume.
- Mass from volume (weight of a liquid or material)How much a volume of water, oil, steel or concrete weighs.
- Weight force calculator (W = m × g)The weight of a mass in newtons, on Earth, the Moon, Mars or with your own gravity.
- Speed, distance and time calculatorType two of speed, distance and time: we work out the third.
- JSON parserCheck JSON syntax and see where parsing errors occur.
- JSON viewerShow JSON with readable indentation and count its top-level items.
- Base64 to image converterPreview and download an image from a Base64 string.
- XML formatterValidate and indent an XML document to make it easier to read.
- XML pretty printFormat XML with a choice of two-space or four-space indentation.
- XML editor and validatorCheck an XML document’s tags and structure as you enter it.
- JavaScript beautifierReindent JavaScript to make it easier to read and edit.
- Word counter and reading timeCount the words, characters, sentences and paragraphs of a text, with its reading time.
- Case and slug converterTurn text into uppercase, lowercase, camelCase, snake_case, kebab-case or a URL slug.
- UUID generatorGenerate random v4 UUIDs or time-ordered v7 UUIDs, up to 100 at a time.
- Regular expression testerTest a JavaScript regular expression on a text and see every match and its groups.
- SHA hash generatorCompute the SHA-256, SHA-384, SHA-512 or SHA-1 hash of a text, in hex or Base64.
- QR code generatorCreate a QR code for a link, text or Wi-Fi and download it as SVG.
- Color contrast checker (WCAG)Compute the contrast between a text color and a background color, and check AA and AAA levels.
- Cron expression explainerUnderstand a cron expression field by field and see its next run times.