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The tools you need,
right in your browser.

Calculators, unit and data converters, a word counter, coordinates and maps, BMI and more. No sign-up, no install — and nothing you enter or open is ever stored.

Popular tools

Scientific Calculatorsin cos log √ ^ π, with a degree/radian keypadOpen → Word & Character CounterCharacters, words, CJK characters, UTF-8 bytes and reading timeOpen → CSV, JSON & XML ConverterCSV, TSV, JSON, XML and Excel in one tool, with correct CJK encodingOpen →

All tools

Math & units

CalculatorSimple everyday calculator with history and percent keyOpen → Scientific Calculatorsin cos log √ ^ π, with a degree/radian keypadOpen → Percentage CalculatorX% of Y, what % one number is of another, % changeOpen → Unit ConverterLength, weight and temperature in every unitOpen →

Utilities

Date CalculatorDays between dates, or add and subtract days, weeks, months and yearsOpen → Word & Character CounterCharacters, words, CJK characters, UTF-8 bytes and reading timeOpen → CSV, JSON & XML ConverterCSV, TSV, JSON, XML and Excel in one tool, with correct CJK encodingOpen → Coordinate Converter & MapDecimal, DMS and DDM coordinates with distance, map view and GPX/KML exportOpen → Password GeneratorStrong random passwords with length, symbols and strengthOpen → QR Code GeneratorFree QR codes for links and text, PNG or SVG downloadOpen → QR Code & Barcode ScannerRead QR codes and barcodes with your camera or an imageOpen → Random Number GeneratorRandom numbers, lottery picks, list picker, dice and coinsOpen → Text Case ConverterUpper, lower, title, camelCase, snake_case, sort and dedupe linesOpen → Image ResizerResize and compress photos to JPG, PNG or WebPOpen →

Color & design

Color ConverterHEX, RGB, HSL and CMYK with WCAG contrast checkOpen → Color PickerPick colors from a palette, your screen or a photoOpen → Color Palette GeneratorComplementary, analogous, triadic and shade palettesOpen → CSS Gradient GeneratorLinear, radial and conic gradients with CSS and PNGOpen → Image Color ExtractorFind the main colors of any photo or logoOpen → Color Contrast CheckerWCAG AA and AAA contrast check with fixesOpen →

Developer

Base64 & URL Encoder/DecoderBase64, URL, HTML, HEX and Unicode encode and decodeOpen → Unix Timestamp ConverterUnix time to date and back, any time zoneOpen → JSON Formatter & ValidatorPretty-print, minify and validate JSON with error linesOpen →

Money

Loan EMI CalculatorMonthly payment, total interest and repayment for any loanOpen → Compound Interest CalculatorFuture value of monthly investing and lump sumsOpen → Bill Split & Tip CalculatorSplit the bill, add a tip and round up to an easy amountOpen → Discount CalculatorSale price, discount rate, amount saved and the original price in one placeOpen →

Health

BMI CalculatorBody mass index, weight category and healthy weight by heightOpen → BMR & Calorie CalculatorBasal metabolic rate and daily calories by activityOpen →

Sources shown

Formulas and conversion rules follow original materials — laws, public agencies, medical societies and international standards — and every page lists its sources.

Runs on your device

Every calculation and conversion happens in your browser. The values and files you use are never sent to a server or stored.

Always growing, kept current

We keep adding tools people need, and when rates or rules change we fix them right away and note the date we checked.