Unit converter
Convert the everyday units at once: length, mass, volume, surface, temperature, speed, pressure, energy, time and computing units (Ko against Kio). A kilobyte is 1 000 bytes while a kibibyte is 1 024, and a US gallon is 3.785 litres against 4.546 for an imperial one — the kind of difference that throws off a quick estimate. The conversion is a plain number, computed on your device.
- 100% local
- Free · no account
- Instant result
This tool runs entirely in your browser — nothing is sent to a server.
Converting between units seems simple, but two families must not be mixed up: units that are linear multiples (1 mile = 1.609344 km, exact) and units that are non-linear conversions (°C to °F, which requires a shift: (t + 40) × 9/5 − 40). Applying a simple ratio to temperatures is the most common error.
This converter covers length, area, volume, mass, temperature, pressure, energy, power, data, time and angles, in both directions, with results given to a reasonable number of digits.
How it works
Type the figures or drop the file you want to process — the tool checks them as you go.
Everything is computed directly in your browser. Nothing is sent to a server.
The result appears instantly, with the detailed breakdown ready to copy, download or keep.
Why use this tool
No account, no download, no limit: the result appears as soon as you enter your data.
Every rule, algorithm and check reflects what we use ourselves every day at Flexina.
The calculations follow the official standards, and the step-by-step detail lets you double-check the outcome.
What does running it locally bring you?
Files, figures and documents never leave your device: nothing is stored, nothing is sent.
Once the page is loaded, you can cut the network: the tool keeps working.
No upload, no account, no third-party server in between: results stay fast and fully private.
Frequently asked questions
Why is °C to °F not a simple multiplication?
Because the two scales do not start at the same point: 0 °C is 32 °F. The correct formula applies an offset in addition to the ratio: (t + 40) × 9/5 − 40. The tool handles this case specially.
Are the conversions exact?
Those that are defined exactly (miles to kilometres, inches to centimetres, bits to bytes) are given at full precision. Others — a barrel, a stone, a calorie — depend on the standard in force, which is stated in the tool.
Can I convert a whole list of values at once?
Yes, paste the values separated by spaces, commas or line breaks: each is converted and listed in the same order.