A fast, free tool — built for students.
Karo Convert turns everyday questions into instant answers: convert any units in plain language, run a scientific or graphing calculator, and search trusted educational sources — all on one quiet, fast page.
What Karo Convert does
Three connected tools, no sign-up required:
- Universal converter. Type something like “100 km to miles” or “350 F to C” and get the answer immediately. It covers length, mass, temperature, area, volume, speed, time, digital storage, energy, power, pressure, fuel economy, angle, frequency, force, data rate and number bases.
- Scientific & graphing calculator. A full keypad with trigonometry, logarithms, powers and roots, plus a graphing mode you can pan and zoom.
- Study search. A refined search that returns results only from free, ad-free educational sources — Wikipedia, open textbooks and dictionaries — in many languages.
Who it’s for
Students of every age, and anyone who needs a quick, reliable answer: a pupil checking homework, a home cook converting a recipe, a traveller reading road signs, a developer sizing a file. Because the study search uses sources that exist in hundreds of languages, it’s designed to be useful anywhere in the world.
How it stays free
The tools are built to cost almost nothing to run, so they can stay free for everyone. Two slim, clearly-labeled ad slots help cover the bills. If you’d rather not see them, a one-time donation removes ads on your device — that’s a thank-you, and it helps keep Karo Convert free for the students who rely on it.
What we care about
- Accuracy. Conversions use exact, documented factors; the guides show the formulas so you can check the math yourself.
- Privacy. The tools run in your browser. There are no accounts, and your saved searches stay on your device. See our Privacy Policy.
- Calm. No pop-ups, no walls of ads, no clutter — just the answer.