You can learn anything. For free.
Spend an afternoon brushing up on statistics. Discover how the Krebs cycle works. Get a head start on next semester's geometry. Prepare for upcoming exams. Or, if you're feeling particularly adventurous, learn how fire-stick farming changes the landscape of Australia.
Whether you're a student, teacher, homeschooler, principal, adult returning to the classroom after 20 years, or a friendly alien trying to get a leg up in earthly biology — Khan Academy's personalized learning library is available to you, for free.
- Learn anything, for free: Thousands of interactive exercises, videos, and articles at your fingertips. Study math, science, economics, finance, grammar, history, government, politics, and much, much more.
- Sharpen your skills: Practice exercises, quizzes, and tests with instant feedback and step-by-step hints. Follow along with what you're learning in school, or practice at your own pace.
- Keep learning when you're offline: Bookmark and download your favorite content to watch videos without an internet connection.
- Pick up where you left off: Tailored to your current learning level, our mastery system gives instant feedback and recommendations on exactly which skills and videos to try next. And, if you choose to create a free account, your learning syncs with http://khanacademy.org, so your progress is always up-to-date across all your devices.
Learn using expert-created videos, interactive exercises, and in-depth articles in math (arithmetic, pre-algebra, algebra, geometry, trigonometry, statistics, calculus, differential equations, linear algebra), science (biology, chemistry, physics), economics (microeconomics, macroeconomics, finance and capital markets), humanities (art history, civics, finance, US history, US government and politics, world history), and more (including computer science principles)!
Already familiar with the Khan Academy website? Not all functionality is available in this app. Community discussions, computer programming content, test prep, parent tools, teacher tools, and district tools should all be accessed directly at http://khanacademy.org.
Khan Academy is a 501(c)(3) nonprofit organization, with the mission of providing a free, world-class education for anyone, anywhere.
∙ Introducing support for Danish!
∙ Bug fixes and performance improvements.
Ratings and ReviewsSee All
Khan Academy is an education app for everyone—whether you’re a parent helping your first grader with geometry or a postgrad looking for a deep dive into microfinance. If there’s a topic you want to learn about—no matter how basic or advanced—chances are Khan Academy has a video lesson for it.
Absolutely amazing information
I love the way you present all of this information. I’m re learning it all 20x better than I ever did at school thanks to the way that you teach it. The diagrams and colours make it very easy to visualise what I’ve learned when thinking about it all a few hours later to solidify the information in my mind.
Also the quiz section at the end of each section are very thorough and well put together. Currently the only thing I would update is that when moving rays and lines around on some of the quiz sections (not all just some) the whole page moves as well as the line...this can get a bit frustrating...but absolutely love this and can’t wait to brush up on more of these fundamentals...I reckon once I have I’ll be delving into some of your more advanced topics, thanks so much! Ps your voice sounds like John Mayer at least 70% of the time you talk...and I mean identical, my g/f was next to me while studying and said...John Mayer can’t know all of this about Physics and Maths as well!?
Developer Response ,
Thank you so much for the great review :)
Please try uninstalling/reinstalling the app. If the issue persists, we would be more than happy to investigate further, please send us a ticket over at our support hub!
Here's the URL: http://khan.co/KA-support
Thank you for your interest in helping to improve Khan Academy!
Back to school
I’m 60 and we’re in lockdown so I decided to use the time as much as I could: gardening, learning to play the piano, an Italian language course, brushing up on my Latin - and maths! I had a great maths teacher, but he taught by rote, so you just had to learn the rules and then solve the problems - but there wasn’t very much real-world application in any of this. Anyway, I’ve forgotten it all because there was no meaning to it. Khan Academy is taking me back to the maths classroom. I’m finding out how great Mr Williams, my teacher, was in giving me the know-how, but now at my age, it starts to make more sense. The structuring of the classes is excellent with a good balance of videos and tests to see how much has sunk in. I’m a bit disappointed that the subject limit is 9 but I suppose that means I’m going to have to become an algebra whizz before I can pick another subject.
This is a great resource for students and old’ns like me who just want a refresher.
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- Khan Academy
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