Free Online Unit ConvertersLength, Area, Volume, Weight, Temperature, Data & Speed

Instantly convert between 286+ units of measurement β€” metres, acres, litres, kilograms and hundreds more. Fast, accurate, and completely free. No sign-up required.

Explore Tools
286 Unit Tools
7 Categories
100% Free Forever

Lightning Fast

Instant results, no loading spinners.

100% Free Access

No sign-up, no paywalls, ever.

Works on Any Device

Mobile-first responsive design.

Privacy First

No data collection or tracking.

All Unit Systems

SI, Imperial, US & historic units.

Explore Our Free Unit Conversion Tools

Browse 286 unit converters across seven categories.

Length Unit Converters

All standard and historic length measurement units

37 Tools

Area Unit Converters

Square units, acres, hectares, and more

47 Tools

Volume Unit Converters

Litres, gallons, cubic units, and culinary measures

88 Tools

Weight & Mass Unit Converters

Kilograms, pounds, scientific & historic mass units

67 Tools

Temperature Unit Converters

Celsius, Fahrenheit, Kelvin and more

8 Tools

Data Storage Converters

Bytes, bits, KB, MB, GB, TB and binary units

23 Tools

Speed Unit Converters

km/h, mph, knots, Mach and more

16 Tools

Frequently Asked Questions

Everything you need to know about using Units For All’s free conversion tools.

What is Units For All?
Units For All is a free online platform offering 286+ unit conversion tools across length, area, volume, weight, temperature, data storage, and speed. Every converter is instant, accurate, mobile-friendly, and requires no sign-up.
Are the unit converters free to use?
Yes. All 286 unit converters on Units For All are completely free β€” no sign-up, no paywalls, and no hidden charges.
How accurate are the conversions?
All conversions use exact, internationally recognised conversion factors verified against standard reference sources, so results match trusted scientific and engineering values.
Which unit categories are available?
Units For All covers seven categories: Length (37 tools), Area (47 tools), Volume (88 tools), and Weight & Mass (67 tools) β€” 286 converters in total.
Do the tools work on mobile devices?
Yes. Every tool uses a mobile-first responsive design that works smoothly on phones, tablets, and desktops.