What You Get for Nothing
The math library runs from early counting through AP-level calculus, taking in arithmetic, pre-algebra, algebra I and II, geometry, trigonometry, statistics and precalculus on the way. All of it is free, with no upgrade waiting behind a lesson. For a family watching every dollar, that alone puts it ahead of most of what you would otherwise consider.
The mastery model is the part people underrate. Your child works a skill until they clear a bar rather than until a chapter ends, the practice marks itself, and nobody moves the class along without them. That last piece is exactly what most parents left school to escape. Khan Academy also runs a separate free app, Khan Academy Kids, for ages 2 to 8, covering early reading, phonics and math with no ads and no subscription.
Which Kids It Suits
Picture the child this was built for: somewhere from grade 4 up, reads well enough to follow written instructions, will sit through a video without needing a person, and can tell you when they are stuck. That child can run most of a math year on Khan Academy with you checking in rather than teaching. Older kids do better than younger ones, and the high school material is the strongest thing on the site.
Now picture the child it fights. Younger than grade 3, or a slow reader, or a kid who needs someone at the table talking them through a new idea before the practice makes sense. That child will hit the same wall whatever their age, because the format assumes the video does the teaching. Neither profile is better. They just need different things, and knowing which one is sitting at your table saves you a term.
Choosing a math program is easier when you know what to teach, what to skip, and where to start.
Get the GuideA simple step-by-step plan for getting started.
Where the Gaps Are
Review is the big one. Several courses give a skill less repetition than a print curriculum would, so a child can clear the mastery bar on Tuesday and lose the skill by the following month with nothing bringing it back. Kids who need repeated exposure feel this hardest, and you will see it as a child who seemed fine and now cannot do the thing.
Early elementary is thinner than the middle and upper grades, so the youngest learners get the weakest version of the site. There are no manipulatives, which matters more than it sounds for any child still building a feel for quantity, since blocks and rods and counters do work a screen cannot. And the rhythm of watch a video, do the practice, repeat, goes flat for some kids around the third month. None of these are scandals. They are the shape of a free platform built to scale.
What the AI Assistant Adds, and Whether You Need It
Khanmigo is Khan Academy's AI assistant, and it is the one paid piece. As of August 2026 it runs 4 US dollars a month or 44 US dollars a year for parents and learners, and teachers get it free. It is designed to prompt a child toward an answer rather than hand it over, which is a better default than most tools your child could open instead.
You do not need it, and nothing in the math library is locked behind it. Treat it as an optional extra rather than the real product, and apply the same caution you would to any AI tool your child uses. If you have not settled that question yet, whether your homeschooler should use AI for schoolwork is the place to start, since a tutor-shaped chatbot is still a chatbot.
How Families Make It Work
The families who succeed with it treat it as a spine and not a whole skeleton. They add their own review, going back over old skills weekly rather than trusting the platform to resurface them. They put manipulatives on the table for the younger years no matter what the screen is doing. And they sit with the child for new concepts, letting the video reinforce rather than introduce.
Those same families tend to know where their child sits before they start, which is the step most people skip. Placing a child by their age is how you end up with a kid grinding through material they already own or drowning in material they were never ready for. If your child is finding math hard in a way that does not look like a placement problem, math curriculum for dyscalculia covers what to look for and what to change.
When to Buy Something Instead
Buy a program when your child needs a person teaching, when they need more practice than the platform gives, or when you need a plan you can open and follow without building one. Paid curricula are largely selling you those three things, and they are worth money to the right family. Our comparisons of Math With Confidence and Math Mammoth and of Saxon and Singapore Dimensions lay out who each one fits.
There is also a middle road most people miss, which is running Khan Academy as your spine and buying one cheap workbook for review. That costs a fraction of a full program and closes the largest gap. You do not have to pick a side here, and the families who do best rarely do.
Before you commit to a program, free or paid, find out where your child is in math right now.
Take the Free Math AssessmentA levelling tool, not a diagnostic. Takes about 20 minutes.
A Note from Homeschool Teacher Guide: What This Really Means for You
We think Khan Academy is one of the better things on the internet, and we would still not tell you to run your whole math program on it without looking at your child first. Free is not the same as suitable, and the cost of getting this wrong is not the money. It is a year where your child quietly stops keeping up and nobody notices until the gap is wide.
What we would hold onto is the review point. If you take one thing from this, build your own review into the week, whatever program you use. The platform will tell you your child has mastered a skill, and mastery on a Tuesday is not the same as mastery in March. Check the old skills yourself now and then. That habit costs nothing and catches the problem this platform is most likely to hand you.
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☕ Buy us a coffee ($5)Frequently Asked Questions
Is It Really Free?
The core platform is free, with all the math from the early grades through calculus, and nothing about the lessons or practice sits behind a payment. Khan Academy Kids, the separate app for ages 2 to 8, is free too. The one paid piece is Khanmigo, the AI assistant, at 4 US dollars a month or 44 a year for parents and learners as of August 2026. You do not need it to use the math.
Can It Be My Child's Only Math Curriculum?
For some kids it can. It suits a child from roughly grade 4 up who reads well, sits through a video, and can say when they are stuck. Younger kids, slower readers, and kids who need more repetition or something to hold usually need a second source alongside it. The answer turns on your child rather than on the platform.
What Are the Gaps?
Less review than a print curriculum in several courses, so skills can fade after your child clears them. Thinner coverage in early elementary than in the grades above. No physical manipulatives. And a video-then-practice rhythm that goes stale for some kids after a few months. Each one is manageable once you know it is coming.
Is It Accredited?
No. It gives no credits, no transcript, and no diploma. Most homeschooling families build their own transcript anyway, so this matters less than parents expect, though it does mean Khan Academy proves nothing to a school board or an admissions office by itself.
What Age Is It Good For?
The main site works from roughly grade 3 up and gets stronger with age, with the high school math its clearest strength. Kids aged 2 to 8 have a separate free app, Khan Academy Kids, covering early reading, phonics and math. The weak spot is early elementary on the main site.
Sources
This guide was written in August 2026 from the following sources. Platform features and pricing change, so confirm current details with Khan Academy before deciding.