How to convert between units online
To convert between units, open the ToolCrix Unit Converter, choose a category (length, weight, temperature, area, volume, speed, data and more), enter a value and pick the ‘from’ and ‘to’ units. The converted result appears instantly, accurate to the SI factors — free, private, and it works offline once loaded.
Need to convert between units — length, weight, temperature, area, volume, speed, data and more? This free browser unit converter gives instant, accurate results across 13 categories. No app, no sign-up, works offline.
Why an all-in-one converter beats searching each time
Searching ‘5 miles in km’ every time is slow, and ad-heavy converter sites are worse. One clean converter with every common category saves time and keeps working even without internet.
Accuracy matters for cooking, travel, study and work — this tool uses precise SI conversion factors so the numbers are trustworthy.
How to use it (step by step)
- Open the Unit Converter.
- Choose a category (length, weight, temperature, etc.).
- Enter a value and pick the ‘from’ and ‘to’ units.
- Read the converted result instantly.
- Use the swap button to reverse the conversion.
What you can use it for
- Converting recipe measurements (cups, grams, ml).
- Travel: miles/km, °C/°F, kg/lb.
- School and science homework.
- File and data sizes (MB, GB, MiB).
- DIY and construction measurements.
Categories you can convert
- Length, weight, temperature, area, volume
- Speed, pressure, energy, power
- Data size, time and angle
Tips
- Temperature isn't a simple ratio — the tool handles the °C/°F/K formulas for you.
- Watch binary vs decimal data sizes (1 KiB = 1024 bytes).
- Use swap to quickly check the reverse conversion.
- Round only at the end for multi-step conversions.
Frequently Asked Questions
How do I convert miles to kilometres?
Open the Unit Converter, choose Length, enter the miles and select km — 1 mile = 1.609 km.
Is the unit converter free?
Yes — free, instant and private, with no sign-up.
Does it convert temperature correctly?
Yes. It applies the proper Celsius/Fahrenheit/Kelvin formulas, not a simple ratio.
Does it work offline?
Yes. Once the page loads it runs entirely in your browser.
How many categories does it support?
13, including length, weight, temperature, area, volume, speed, data and more.
How do I convert miles to kilometres?
1 mile = 1.609 km. The ToolCrix Unit Converter does it for you — choose Length, enter the miles and select km. It also handles km/h, °C/°F and 11 more categories accurately.
Does it convert binary data sizes correctly (MB vs MiB)?
Yes — the converter uses the correct binary factors (1 MiB = 1024 KiB) and the decimal factors (1 MB = 1000 KB) separately, so file-size and storage conversions are accurate.
Try it now: open the free Unit Converter or the Percentage Calculator, or browse more guides.