Tool category
Free Online Unit Converters
Unit converters show all conversions at once — type in any unit and every other value updates instantly. Covers length, weight, temperature, speed, area, volume, data, and time.
8 tools in this category
Length Converter
Convert between centimetres, metres, kilometres, inches, feet, yards, and miles instantly. All units update simultaneously — no account, browser-only.
Open toolWeight Converter
Convert weight between kilograms, pounds, ounces, grams, milligrams, stone, and metric tons instantly. All units live-update — browser-only.
Open toolTemperature Converter
Convert temperature between Celsius, Fahrenheit, Kelvin, and Rankine instantly. Live conversion as you type — no account, browser-only.
Open toolSpeed Converter
Convert speed between mph, km/h, m/s, knots, and ft/s instantly. All units update live as you type — browser-only, no account required.
Open toolArea Converter
Convert area between square feet, square metres, acres, hectares, and more instantly. All units live-update — browser-only.
Open toolVolume Converter
Convert volume between litres, millilitres, gallons, fluid ounces, cups, pints, quarts, and cubic units instantly — browser-only.
Open toolData Storage Converter
Convert between bits, bytes, KB, MB, GB, TB, and PB instantly. Shows both SI (decimal) and IEC (binary) values — browser-only.
Open toolTime Unit Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks, months, and years instantly — browser-only, free.
Open toolHow this category works
Unit converter tools handle the most common physical and digital measurement conversions instantly in your browser. Every tool shows all relevant units simultaneously so you can see the full picture at a glance — no back-and-forth switching between fields.
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Frequently asked questions
How accurate are the unit conversions?
All conversion factors use internationally recognised exact or agreed values (SI, NIST). Results are shown to up to 10 significant figures.
Can I enter a value in any unit field?
Yes. Every unit field is editable. Type a value in any unit and all other units update simultaneously.
Do these tools work offline?
Yes. All unit conversion logic runs in your browser with no network calls needed after the page loads.