What is Danica McKellar’s IQ?
Terence Tao, who taught her topology at UCLA in 1997, wrote that she was the second-best student in the class.
Danica McKellar’s IQ is unknown: no IQ test result has been published for her, and the 154 that a May 2025 celebrity list gives her cites no test. What is documented is a UCLA mathematics degree, summa cum laude, and a 1998 paper, co-authored with Lincoln Chayes and Brandy Winn, in the Journal of Physics A.
Danica McKellar’s estimated IQ
- A Bachelor of Science in mathematics from UCLA, awarded summa cum laude. ABC News reported on August 10, 2007 that she graduated “summa cum laude with a degree in math”; Wikipedia dates the degree to 1998.
- A peer-reviewed paper with Lincoln Chayes and Brandy Winn, “Percolation and Gibbs states multiplicity for ferromagnetic Ashkin–Teller models on ℤ²,” Journal of Physics A: Mathematical and General, volume 31, issue 45, pages 9055–9063, dated November 13, 1998 (DOI 10.1088/0305-4470/31/45/005).
- Terence Tao’s account, published August 20, 2007, that she took his Introduction to Topology class in 1997 and “was the second-best student there.”
- NPR’s Weekend Edition Saturday described her on February 11, 2006 as a math scholar who had recently proved her own theorem.
This is an inference from academic work, not a test result. The paper has three authors, so it does not show which parts were hers, and her highest documented degree is a bachelor’s, not a doctorate. A class ranking from one teacher is a judgment, not a score, and no school, employer or clinician has released an IQ result. The range is wide for those reasons.
- Born
- January 3, 1975, La Jolla, California
- Education
- Bachelor of Science in mathematics, UCLA, summa cum laude (1998, per Wikipedia)
- Published paper
- “Percolation and Gibbs states multiplicity for ferromagnetic Ashkin–Teller models on ℤ²,” Journal of Physics A: Mathematical and General 31 (45), 9055–9063, November 13, 1998, with Lincoln Chayes and Brandy Winn
- Known for
- Winnie Cooper in The Wonder Years (ABC, 1988–1993); math books for middle-school and high-school girls
- First book
- Math Doesn’t Suck (Hudson Street Press hardcover, August 2, 2007)
- Honor
- Joint Policy Board for Mathematics Communications Award, January 2014 (per Wikipedia)
- Circulating figure
- 154 in a May 2025 celebrity list; no test cited
What an IQ of 135–150 actually means
Set the claim aside for a moment. If someone genuinely scored in this range, here is what that would represent.
Average is 100 by construction, and about two-thirds of people fall between 85 and 115. Take the test to place your own score on this scale.
| Score range | Classification | Share of people | What it indicates |
|---|---|---|---|
| 85 – 114 | Average | ~68% | The range most people fall into. |
| 115 – 129 | Above average | ~13.6% | Roughly one person in seven. |
| 130 – 144 | Gifted | ~2% | The threshold most high-IQ societies use. |
| Above 144 | Highly gifted | ~0.1% | Figures above this range are extrapolated from the curve rather than measured. |
Percentages are approximate and describe a normal distribution. The same number means different things on tests with different standard deviations.
Thirty questions gives you a measured position on this exact scale — your score, your percentile and the ability breakdown behind it.
Find out in 30 minutes →Who Danica McKellar is
Danica McKellar was born on January 3, 1975, in La Jolla, California, according to Wikipedia. She is best known as the actress who played Winnie Cooper in the ABC series The Wonder Years, which ran from 1988 to 1993. She had a recurring role as Elsie Snuffin in the 2002–03 season of The West Wing.
Those roles are context only; they say nothing about test performance. As of November 2026, Wikipedia’s filmography, last edited on October 5, 2026, lists her work through 2025, including television films for Great American Family and a guest appearance as herself in Futurama.
Danica McKellar’s math degree is a Bachelor of Science in mathematics from the University of California, Los Angeles, awarded summa cum laude. Wikipedia dates it to 1998, and ABC News reported the honor in 2007. In 1997 she took Terence Tao’s Introduction to Topology class there. Tao wrote on August 20, 2007 that she “was the second-best student there,” and that the only student who did better was Brandy Winn, who co-authored her paper.
What is the Danica McKellar theorem? It is the Chayes–McKellar–Winn theorem, the name given to the main result of a paper by Lincoln Chayes, D. McKellar and B. Winn. Crossref records it in the Journal of Physics A: Mathematical and General, volume 31, issue 45, pages 9055–9063, dated November 13, 1998, from IOP Publishing.
Wikipedia says she wrote it as an undergraduate. Tao summarized the result in 2007: in the Ashkin–Teller model, a simplified model of magnetism, the Curie temperature equals the critical temperature below which percolation can occur. NPR introduced her in February 2006 as a math scholar who had recently proved her own theorem.
Her first book, Math Doesn’t Suck: How to Survive Middle-School Math Without Losing Your Mind or Breaking a Nail, was published by Hudson Street Press; Open Library dates the hardcover August 2, 2007. Tao wrote that it is aimed at pre-teenage girls as a friendly introduction to middle-school mathematics.
Wikipedia lists later titles including Kiss My Math, Hot X: Algebra Exposed (2010) and Girls Get Curves: Geometry Takes Shape (2012), and reports that she received the Joint Policy Board for Mathematics Communications Award in January 2014.
By Elora Mercer, Celebrity Research WriterFigures checked by Leon Falkner, Data & Research AnalystReviewed by Aarav Vardhan, Editor-in-Chief · Last reviewed November 2026
Danica McKellar: the documented record
The estimate above rests on this record. Every entry here is a matter of public fact, which is more than can be said for the number itself.
- 1975Born January 3 in La Jolla, California.
- 1988–1993Plays Winnie Cooper in the ABC series The Wonder Years.
- 1997Takes Terence Tao’s Introduction to Topology class at UCLA; Tao later calls her the second-best student in it.
- 1998Earns a Bachelor of Science in mathematics, summa cum laude, from UCLA, according to Wikipedia.
- November 13, 1998The Journal of Physics A: Mathematical and General dates the Chayes–McKellar–Winn paper on percolation and Gibbs states.
- 2002–2003Recurring role as Elsie Snuffin in The West Wing.
- February 11, 2006NPR’s Weekend Edition Saturday introduces her as a math scholar who recently proved her own theorem.
- 2007Math Doesn’t Suck is published (hardcover dated August 2); ABC News names her Person of the Week on August 10.
- January 2014Receives the Joint Policy Board for Mathematics Communications Award, according to Wikipedia.
- 2025Wikipedia’s filmography lists a guest appearance as herself in Futurama among her latest work.
Where the 154 figure came from
Following a claim back to its first appearance is the part almost nobody does — and it is what most people are actually asking.
No IQ test result has been published for Danica McKellar, so Danica McKellar’s IQ is unknown. The 154 attached to her name comes from a celebrity list, not from a test. Factinate’s “Celebrities With The Highest IQs,” published on May 6, 2025, calls her “a mathematician and education advocate with an IQ of 154” and names no test, date or examiner.
The same list gives 154 to Cindy Crawford and to Ben Affleck, for whom this site’s range is 120–135, so one value is doing duty for several people. For how such figures spread, and what to check first, see where celebrity IQ numbers come from.
How smart is Danica McKellar? Her documented record is that of a trained mathematician. ABC News reported on August 10, 2007 that she graduated “summa cum laude with a degree in math,” and the mathematician Terence Tao wrote on August 20, 2007 that she took his Introduction to Topology class at UCLA in 1997 and “was the second-best student there.” Those are judgments of coursework by named people. They are evidence of mathematical ability, but they are not a score.
Is Danica McKellar a genius? Her record is that of an accomplished mathematics student who co-authored a published theorem paper and later wrote math books for girls. “Genius” has no fixed IQ cut-off; see what genius-level IQ means.
Her estimated IQ, 135–150, sits level with Natalie Portman (135–145), who studied psychology at Harvard, and overlaps Mayim Bialik (140–155), who holds a neuroscience doctorate, and Hedy Lamarr (130–150), an actress with a documented 1942 patent. Factinate’s own list gives Bialik 163, which shows how loosely such numbers track the records behind them.
On the usual scale (mean 100, standard deviation 15), 135 is about 1 in 102 people and 150 is about 1 in 2,331, while the 154 in Factinate’s list would be about 1 in 6,285.
The circulating figure is four points above the top of the range this page can support, which fits the usual direction of error: sourced records tend to support a lower number than the one that circulates. Use the percentile calculator to see any score in between, and see the other actors we have checked for how their ranges compare.
How we read a number →No school, employer or clinician’s IQ result for McKellar is public. The ABC News, NPR, Terence Tao, Crossref and Open Library pages describe a degree, a class, a paper and a book, and none gives an IQ. The only figure is the unsourced 154 in a celebrity list.
States that she is “a mathematician and education advocate with an IQ of 154.” Names no test, date, examiner or source. The same list gives 154 to Ben Affleck and Cindy Crawford and says Mayim Bialik “has an IQ of 163 and a PhD.”
Lists the three authors; volume 31, issue 45, pages 9055–9063; issued November 13, 1998; publisher IOP Publishing. The registered title omits the ℤ² symbol.
Says she took his Introduction to Topology class in 1997 and “was the second-best student there”; names the paper’s co-authors Brandy Winn and Lincoln Chayes; describes her book as a friendly introduction to middle-school mathematics for pre-teenage girls; and summarizes the theorem as an equality between the Curie temperature and the percolation critical temperature in the Ashkin–Teller model.
Says that after “graduating summa cum laude with a degree in math and a published physics theorem,” she realized she had something to offer off-screen; names The Wonder Years and The West Wing among her acting credits.
Describes her as a math scholar who “recently proved her own theorem” and as the actress who played Winnie on The Wonder Years.
Lists the hardcover from Hudson Street Press, publish date August 2, 2007, 320 pages, with the full subtitle “How to Survive Middle-School Math Without Losing Your Mind or Breaking a Nail.”
Used for her birth date and place, the 1998 Bachelor of Science in mathematics (summa cum laude) from UCLA, the statement that she co-wrote the paper as an undergraduate, The Wonder Years dates (1988–1993), the 2002–03 West Wing role, the book list and the January 2014 JPBM Communications Award. The article’s Wikidata link is Q242949.
The sources behind our estimate
The figures that circulate for Danica McKellar, what we were able to confirm, and where the two diverge.
A figure of 154 appears for her in Factinate’s list “Celebrities With The Highest IQs,” published on May 6, 2025, which describes her as a mathematician and education advocate with that IQ.
Factinate states 154 without naming a test, a date, an examiner or a source. The same list gives 154 to Ben Affleck and Cindy Crawford, and 163 to Mayim Bialik. ABC News, Terence Tao, NPR and the journal record describe a degree, a class, a theorem and a paper; none gives an IQ.
154 sits four points above the top of this site’s range of 135–150 for Danica McKellar, so the gap is small. But it is still a number with no test behind it. The documented record supports a high range in mathematics; it does not turn into a score, and a value repeated across a list is not a measurement.
Want a number that does hold up? Every figure on this page is somebody’s claim. Take the 30-question test and get a percentile you can check rather than a figure you have to trust.
Danica McKellar — frequently asked
What is Danica McKellar’s IQ?
No IQ test result has been published for Danica McKellar, so Danica McKellar’s IQ is unknown. A May 2025 Factinate list gives 154 and cites no test. This site’s estimated range is 135–150, inferred from her UCLA mathematics degree and 1998 physics paper, not from a test.
What is Danica McKellar’s IQ score?
No IQ score has been published for Danica McKellar, and no source shows that she took an IQ test. The 154 in Factinate’s May 2025 list names no test, date or examiner. On a scale with mean 100 and standard deviation 15, the range 135–150 is about 1 in 102 to 1 in 2,331 people.
How smart is Danica McKellar?
Her documented record is that of a trained mathematician: a UCLA Bachelor of Science in mathematics, summa cum laude, and a co-authored paper in the Journal of Physics A dated November 13, 1998. Terence Tao wrote in 2007 that she was the second-best student in his 1997 topology class.
Is Danica McKellar a genius?
The documented record is that of an accomplished mathematics student: a summa cum laude UCLA degree and a co-authored theorem paper from 1998. “Genius” has no fixed IQ cut-off, and no test score backs the word for her.
How does Danica McKellar’s estimated IQ compare with Mayim Bialik’s?
This site estimates 135–150 for Danica McKellar and 140–155 for Mayim Bialik. Bialik holds a doctorate; McKellar’s highest degree is a bachelor’s, plus a co-authored theorem paper. Both ranges rest on records, not tests, and overlap from 140 to 150, so neither can be called higher.
Where does the 154 for Danica McKellar come from?
It comes from Factinate’s “Celebrities With The Highest IQs,” published on May 6, 2025, which calls her a mathematician and education advocate with an IQ of 154. The list cites no test, date or examiner, and it gives 154 to Ben Affleck and Cindy Crawford as well.
What is the Chayes–McKellar–Winn theorem?
It is the main result of a 1998 paper by Lincoln Chayes, Danica McKellar and Brandy Winn in the Journal of Physics A. Terence Tao summarized it in 2007: in the Ashkin–Teller model of magnetism, the Curie temperature equals the critical temperature below which percolation can occur.
How does my IQ compare with Danica McKellar?
You can find out in about fifteen minutes. The IQ Metrics assessment is 30 questions, scored on the same 100-mean scale used throughout this page, so your result and the estimate above are at least expressed in the same units — one measured, one inferred. Once you have a number, the leaderboard shows where it would sit, and how we score and norm it explains the benchmarking.
Where does this estimate come from?
From the documented record rather than a test — the method is named above and set out in full under how we read a number. Compare it against the other actors profiles, starting with Natalie Portman.
- Take the 30-question IQ test — get a measured score and percentile of your own
- Average IQ by country — how the scale behaves across populations
- How IQ Metrics scores its assessment — the method behind our own number
- More on how IQ testing works — reliability, error and what a score can and cannot say
- More actors profiles — same field, same method
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Photograph by iDominick, CC BY-SA 2.0. Background removed for the portrait above. · Portrait via Festival de Deauville, CC BY 4.0. Background removed for the portrait above. · Portrait of Hedy Lamarr from the Los Angeles Times Photographic Collection, UCLA Library (January 19, 1939; Commons file), CC BY 4.0. Cropped and with background removed for the portrait above.
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