Digital & Data Converters
21 live calculators · free, instant & privateData storage converterBytes to GB and GiB — including why your drive looks smaller than advertised.Open calculator →Number Base calculatorBinary, octal, hex, any base 2-36, two's complementOpen calculator →HEX to RGB converterHEX, RGB and HSL with WCAG contrast checkOpen calculator →px to rem converterPixels to rem at any root font sizeOpen calculator →Unix timestamp converterEpoch to date, auto-detects seconds vs millisecondsOpen calculator →Roman numerals converterRoman numerals to numbers, vinculum to 3,999,999Open calculator →Military time converter24-hour to 12-hour clock, both directionsOpen calculator →Time zone calculatorAny city or US zone, daylight saving resolved for the exact date, EST vs EDT spelled outOpen calculator →EST to CST calculatorEastern to Central for a given date, plus a full 24-hour tableOpen calculator →CST to EST calculatorCentral to Eastern for a given date, plus a full 24-hour tableOpen calculator →EST to PST calculatorEastern to Pacific, the three-hour coast-to-coast gapOpen calculator →PST to EST calculatorPacific to Eastern, with market and broadcast hoursOpen calculator →CST to PST calculatorCentral to Pacific, two hours and a wide shared dayOpen calculator →PST to CST calculatorPacific to Central for a given dateOpen calculator →MST to EST calculatorMountain to Eastern, including why Arizona breaks the ruleOpen calculator →EST to MST calculatorEastern to Mountain, Denver and Phoenix handled separatelyOpen calculator →UTC to EST calculatorUTC to Eastern, offset resolved for the date not for todayOpen calculator →EST to UTC calculatorEastern to UTC, add five in winter and four in summerOpen calculator →EST to IST calculatorEastern to India, the 9.5 or 10.5 hour half-hour offsetOpen calculator →IST to EST calculatorIndia to Eastern, with the gap that moves from the US sideOpen calculator →Minutes to decimal hours converterTimesheet minutes to decimal hours with payroll roundingOpen calculator →
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Related conversion calculators
From the other conversion sub-categories — same engine, same privacy.
Length converterMetres, feet, inches and miles with exact factors — eight units at once.Measurement →Cooking conversion calculatorCups to grams using each ingredient's real density, plus oven temperatures.Cooking →Unit converter calculatorLength, weight, temperature, volume and area — exact defined factors.Conversion →Weight converterkg, pounds, stone and ounces — including the stone-and-pounds split.Measurement →Grams to cups converterGrams to cups by ingredient, answered as a real measuring-cup fraction.Cooking →Temperature converterCelsius, Fahrenheit and Kelvin with the formula shown each time.Measurement →
Guides for digital
Worked examples and the reasoning behind these calculators. Browse all guides →
ConversionUS Time Zones Explained: EST, CST, MST, PST and UTCConversionEST vs EDT: The One-Hour Mistake Almost Everyone MakesEverydayMinutes to Decimal Hours: The Payroll Conversion ChartConversionHEX to RGB, px to rem, Unix Time: Developer ConversionsConversionWhy Your 1 TB Drive Only Shows 931 GBEverydayHow to Read Roman Numerals (MCMXCIX to MMXXVI)
About these calculators
There are two competing definitions of a gigabyte and both are in daily use: drive manufacturers count 1000 megabytes, operating systems count 1024 mebibytes. That single discrepancy is why a 1 TB drive shows up as roughly 931 GB in your file manager, and this converter shows both figures side by side rather than picking one.
More tools in this group are on the way, including download time estimates from a file size and a connection speed.
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Every category, same promise: runs in your browser, shows its math, never sees your numbers.