Best Site for Learning Math
Summary
The best site for learning math depends on your level and how you learn. 3Blue1Brown's YouTube channel is the best free conceptual visualization for linear algebra, calculus, and neural networks — nothing else explains the why like it does. Khan Academy covers the curriculum end-to-end from arithmetic to early college. Art of Problem Solving is the gold standard for competition-level and advanced math. MIT OpenCourseWare is the free MIT undergraduate experience. Brilliant is the polished paid alternative for puzzle-driven learning. Most listicles default to Khan Academy and stop there; the right tool depends on what you're learning.
Top 5 at a glance
| # | Site | Best for | Price |
|---|---|---|---|
| 1 | Khan Academy | Free comprehensive K-12 through early college math | Free, nonprofit-funded |
| 2 | 3Blue1Brown | Visual conceptual explanations for advanced topics | Free YouTube channel |
| 3 | Art of Problem Solving | Competition-level and proof-based mathematics | Free Alcumus and forums; paid courses and books |
| 4 | MIT OpenCourseWare | Free MIT undergraduate math courses | Free |
| 5 | Brilliant | Polished puzzle-driven paid learning | Subscription with free trial |
Detailed rankings
Khan Academy
Free comprehensive K-12 through early college math
The default for K-12 through introductory college. Pair with 3Blue1Brown for conceptual depth.
Pros
- Comprehensive curriculum from arithmetic to early college calculus and statistics
- Practice problems with feedback at every level
- Mastery-based progression
- Free with no paywall — backed by donations and grants
Cons
- Coverage thins beyond multivariable calculus and linear algebra
- Drill-based approach can feel mechanical to some learners
- Less depth on proof-based mathematics than competition-focused alternatives
Price: Free, nonprofit-funded
Sources: www.khanacademy.org
3Blue1Brown
Visual conceptual explanations for advanced topics
Essential complement to any structured math course. The 'Essence of' series for calculus, linear algebra, and neural networks is referenced by working scientists and engineers years into their careers.
Pros
- Best mathematical visualizations on the internet — calculus, linear algebra, neural networks, probability
- Explains the why before the how — intuition then formalism
- Free on YouTube
- Created by Grant Sanderson, mathematician and educator
Cons
- Not a complete curriculum — selected topics, not exhaustive coverage
- Best for learners who already have some background
- Video-only — no graded exercises
Price: Free YouTube channel
Sources: www.3blue1brown.com, www.youtube.com
Art of Problem Solving
Competition-level and proof-based mathematics
The right pick for advanced and competition-focused learners. Overkill for a student just trying to learn algebra II.
Pros
- Reference resource for serious students from middle school through early college
- Strong community of mathematically advanced learners
- Free Alcumus practice system for problem-solving
- Textbook series widely respected for olympiad-style preparation
Cons
- Courses paid and pricey
- Best fit for students aiming at competition or proof-based study
- Steeper learning curve than Khan Academy
Price: Free Alcumus and forums; paid courses and books
Sources: artofproblemsolving.com
MIT OpenCourseWare
Free MIT undergraduate math courses
The right pick after Khan Academy when you want university-level depth. Gilbert Strang's linear algebra is the gold standard reference.
Pros
- Free access to actual MIT course materials including video lectures
- Linear algebra with Gilbert Strang is a category-defining course
- Single-variable and multivariable calculus, differential equations, probability
- Audit MIT-level rigor without enrollment
Cons
- University pacing — slower than Khan Academy bites
- Less interactive than modern course platforms
- Production quality varies by course and year
Price: Free
Sources: ocw.mit.edu, ocw.mit.edu
Brilliant
Polished puzzle-driven paid learning
The right pick if the puzzle-driven format clicks and the subscription cost fits your budget. Khan Academy and 3Blue1Brown together cover most of the same ground free.
Pros
- Polished interactive lessons
- Strong on probability, programming-flavored math, and applied topics
- Mobile-first design fits daily-practice habit
Cons
- Subscription required for most content
- Less comprehensive than Khan Academy
- Marketing-heavy YouTube sponsorships have made some learners skeptical
Price: Subscription with free trial
Sources: brilliant.org
How we chose
- Coverage relative to your target — arithmetic through PhD covers a huge range.
- Teaching philosophy — drill-based, conceptual, problem-solving, or visual.
- Free versus paid relative to the depth offered.
- Practice problem quality with feedback.
- Visual and intuitive explanation versus formal-only presentation.
- Community for stuck moments — forums, Discord, study groups.
Frequently asked questions
Can I really learn math for free?
Yes, through Khan Academy and 3Blue1Brown for foundations through early college, MIT OCW for university-level depth, and Art of Problem Solving's free Alcumus for problem-solving practice. Paid resources accelerate specific niches but the free path is genuinely complete.
Where should I start if I'm rusty?
Take Khan Academy's diagnostic placement and work backwards until you find a comfortable starting point. Math builds cumulatively — solid foundations make later topics much easier. Rushing past gaps will hurt.
What about math for machine learning specifically?
3Blue1Brown's Essence of Linear Algebra series, MIT Strang's linear algebra, and Khan Academy's probability and statistics cover the foundations. fast.ai's practical deep learning course pairs well. For deeper theory, Christopher Bishop's textbooks remain standards.
How long does it take to relearn high school math?
With consistent daily practice, six months to one year to rebuild competence from scratch. Less if you only need specific topics. Khan Academy's mastery tracking makes the path visible.
Why doesn't Coursera or edX appear in the top?
Both have credible math courses — Princeton, Stanford, MIT all teach math on these platforms. They tend to be more course-specific and time-bound. For continuous study with practice, Khan Academy's mastery model and MIT OCW's free archives serve better. Use Coursera and edX for specific courses you want certificates for.