Simple tools, built right
ConvertGPT is a growing collection of free, fast, in-browser converters and calculators — built for anyone who just wants an accurate number without an account, an app download, or a wall of ads.
Why we built this
Most unit converters online are cluttered, slow to load, or bury the number you need under pop-ups. We wanted something different: a converter that opens instantly, gives you a precise answer, and gets out of your way.
Every calculator on ConvertGPT runs entirely in your browser using exact, internationally defined conversion constants — no server round-trip, no account, and no data collected about the numbers you enter.
What we care about
Speed
Every tool loads fast and calculates instantly, with no waiting on a server.
Accuracy
We use exact, internationally defined constants for every conversion — not rounded approximations.
Privacy
Calculations happen locally in your browser. We don't need your data to give you an answer.
Get in touch
Have a converter you'd like to see, or found something that doesn't look right? We'd like to hear about it — visit our Contact page to reach out.