Unit Converter
Free · no signup · runs entirely in your browser
Open the tool →A unit converter is one of those tools you need for about eleven seconds, three times a month, and never at a convenient moment. This one covers four categories: length, weight, temperature, and data sizes — bytes on up through the gigabyte end of things. Pick a category, pick your from-unit and your to-unit from the dropdowns, type a value, hit convert. There is a swap button for when you picked them the wrong way round, which you will, because everyone does.
Four categories is the honest limit. There is no currency conversion — that needs live exchange rates and a server, and this page has neither. No area, no volume, no speed. If you came here for square feet to hectares, we do not have it, and burying that admission at the bottom of an FAQ would be the coward's move. What is here works. What is not here is not here.
Everything runs in JavaScript in the tab you already have open. Nothing gets uploaded, because there is nothing to upload to — no backend doing the maths, no request going out with your numbers attached. It is free, there is no signup, no account, no ad slot, and no tracking script counting how many times you converted kilograms to pounds because you did not trust the first answer.
On rounding: results are shown to a sensible number of decimal places rather than every digit a floating-point number can technically produce. For cooking, packing, shipping, homework, and working out whether a file fits on a drive, that is already more precision than the situation deserves. For engineering tolerances or lab work, use whatever your field actually mandates — a browser page is not a certified instrument, and pretending otherwise would be a strange move for a free tool.
How to use it
- Choose a category: length, weight, temperature, or data size.
- Pick your from-unit and to-unit from the two dropdowns, then type the value you want converted.
- Hit convert to see the result — and use the swap button if you want to flip the direction without re-picking anything.
Worked example
You have a 3.5 GB video file and a USB stick that reports its free space in megabytes. Choose the data category, set the from-unit to gigabytes and the to-unit to megabytes, type 3.5, and hit convert. Now you know what you are actually dealing with. Realised you wanted it the other way round? Hit swap and the units flip without retyping the value. Same routine for length, weight, and temperature: pick, pick, type, convert.
FAQ
Which units can this convert between?
Four categories only: length, weight, temperature, and data sizes such as bytes, kilobytes, megabytes and gigabytes. There is no currency, area, volume, or speed conversion here.
How precise are the results?
Results are rounded to a practical number of decimal places rather than shown to full floating-point precision. That is fine for cooking, shipping, homework and file sizes; for engineering or lab work, follow whatever precision your field requires.
Does my data get uploaded anywhere?
No. The conversions are done by JavaScript running in your browser tab, so the values you enter never leave your device. There is no account, no server-side processing, and no tracking.
Is it free, and does it work if my connection drops?
It is free with no signup and no ads. Once the page has finished loading, conversions happen locally with no further network calls, so a dropped connection will not stop it — though it is a web page, not an installable offline app.
Open the Unit Converter →