免费在线工具与计算器

Convert mm, cm, m, km, inches, feet, yards and miles instantly.

Convert kg, g, mg, ounces, pounds, stone and tonnes instantly.

Celsius, Fahrenheit, Kelvin and Rankine converted as you type.

Convert liters, ml, gallons, cups, pints, fl oz and more.

Convert m², km², acres, hectares, ft² and more.

Convert km/h, mph, m/s, knots and ft/s.

Convert bytes, KB, MB, GB, TB — decimal and binary.

Convert L/100km, km/L, US mpg and UK mpg.

Work out the tip and split the bill between friends in seconds.

See the final price after a percent-off discount — or find the percentage saved.

Add tax to a price, or remove it from a tax-inclusive price.

Interest = principal × rate × time, computed instantly.

See savings growth with compounding, optional regular contributions.

Monthly payment, total interest and payoff total for any loan.

Estimate monthly mortgage payments including down payment impact.

Trip fuel cost from distance, efficiency and fuel price.

Exact age in years, months, days — plus days lived until a date.

Days, weeks, months and years between any two dates.

Add or subtract days, weeks, months or years from a date.

Count down hours, minutes and seconds with an alarm beep.

Precise stopwatch with laps and hundredths of a second.

Turn any date and time into Unix seconds and milliseconds.

Decode Unix timestamps into readable local and UTC times.

Count working days between dates, with a custom work week.

Strong random passwords — length, symbols and ambiguity options.

Random integers in any range, with optional duplicates allowed.

Flip one or many virtual coins and count heads vs tails.

Roll any number of dice with any number of sides.

Generate v4 UUIDs in bulk with one-click copy.

Make QR codes from links or text and download as PNG.

SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text.

Check text against an expected SHA hash — the valid “reverse” of hashing.

Words, characters, sentences, paragraphs and reading time.

Switch text between UPPER, lower, Title, Sentence and camelCase.

Sort lines A→Z, Z→A, by length, or shuffle them.

Strip repeated lines, optionally ignoring case and trimming space.

Trim line ends, collapse spaces and remove empty lines.

Replace every occurrence, optionally with regex support.

Classic filler text by paragraphs, sentences or words.

Flip characters, words or lines — or mirror each word.

kcal burned per session and per week, from MET tables.

Personal daily water target in liters and glasses.

Four classic formulas and the healthy-BMI range compared.

US Navy tape method: body fat, fat and lean mass.

Estimated due date from LMP with cycle adjustment.

Work back from your alarm in 90-minute sleep cycles.

Body Mass Index from height and weight, with category.

Basal metabolic rate and daily calories by activity level.

Encode text to Base64 or decode it back, URL-safe optional.

Percent-encode or decode URLs and query parameters.

Pretty-print or minify JSON and pinpoint syntax errors.

Convert HEX, RGB and HSL both ways, with a live swatch.

Escape (or unescape) & < > " ' for safe HTML.

Convert decimal numbers to binary, with hex and octal alongside.

Turn 0s and 1s back into a decimal number, validated as you type.

Convert base-10 numbers to hex with prefix and case options.