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Multi-Unit Converter

Convert length, weight, temperature, storage, speed and area units.

Private Instant No sign-up No daily limit

Free to use. No account, no daily limit, and no watermark on the result.

 1 · Convert anything

10 categories

Conversion result

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Every unit is converted through its SI base unit, so metric and imperial values stay consistent even when you mix systems mid-calculation.

 2 · Common conversions

Pick a category to see its most-used conversions.

Quick reference — popular conversions

FromToEquals
1 inchcentimetre2.54 cm
1 footmetre0.3048 m
1 milekilometre1.609344 km
1 kilogrampound2.20462 lb
1 poundgram453.592 g
1 ouncegram28.3495 g
0 °CFahrenheit32 °F
100 °CFahrenheit212 °F
1 megabytebytes1,000,000 B
1 gibibytemebibyte1024 MiB
1 Mbit/skilobyte per second125 KB/s
60 mphkilometre per hour96.56 km/h
1 acresquare metre4,046.86 m²
1 US gallonlitre3.78541 L
1 hoursecond3,600 s
1 barkilopascal100 kPa
1 kWhmegajoule3.6 MJ

How to convert units online

1

Pick a category

Choose length, weight, temperature, digital storage, speed, area, volume, time, pressure or energy from the dropdown.

2

Select the units

Set the “From” and “To” units. Use “Swap units” to reverse the calculation in one click.

3

Type the value

Enter the number you want to convert — the result updates live with your chosen precision.

4

Copy or reference

Copy the result, then check the common-conversion table for a quick reference you can quote anywhere.

Unit converter — frequently asked questions

Each unit is stored as an exact factor against its SI base unit — the metre for length, the kilogram for mass, the second for time and so on. Temperature uses the exact Celsius, Fahrenheit, Kelvin and Rankine relationships, so the factors are as precise as the definitions allow.

That difference is real and matters. GB, MB and TB are decimal units used by storage manufacturers (1 GB = 1,000,000 bytes), while GiB, MiB and TiB are binary units used by operating systems (1 GiB = 1,073,741,824 bytes). Both are listed here so you can convert between them without guessing.

Yes — pick the same category and choose one metric and one imperial unit. For example, select Length, put inch in “From” and centimetre in “To” to see that 1 inch equals exactly 2.54 cm.

Yes. All of the conversion maths runs in your browser with plain JavaScript, so the tool keeps working without an internet connection and no value you type is ever sent anywhere.

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