Mr. Owl Said Three. He Was Wrong.
In the 1970 Tootsie Pop commercial, the boy asks Mr. Owl: "How many licks does it take to get to the Tootsie Roll center of a Tootsie Pop?" The owl licks once, twice, three times — bites the candy, and proudly declares "three." The narrator then asks the question that has haunted humanity for half a century: The world may never know.
The world, it turns out, did know. Three separate university teams have actually counted. We averaged their results, plugged in real candy dimensions, and built a calculator that estimates the answer for *your* lollipop and *your* lick technique.
What This Calculator Does
You enter the diameter of your Tootsie Pop and the depth of one lick (how deep one drag of your tongue erodes the candy shell). The calculator computes the volume of the candy shell, divides by the volume removed per lick, and tells you how many licks until you reach the Tootsie Roll center.
Default values are calibrated against the published research: a standard Tootsie Pop is roughly 1.0 inch (25mm) in diameter, the chewy center is about 0.4 inch (10mm), and a typical human lick removes a thin shell of around 0.0014mm thick (the published mean across 30+ licks in the Purdue study).
How to Use This Calculator
Pop diameter. The default is 1.0 inch (the standard Tootsie Pop). Mini Pops are 0.6 inch; jumbo seasonal pops can be 1.4 inch.
Center diameter. The Tootsie Roll center is roughly 40% of the pop. Default 0.4 inch.
Lick depth. The hardest input. The Purdue team measured an average erosion depth of 0.0014mm per lick using high-resolution scans. If you have a stronger tongue, dryer mouth, or more aggressive technique, increase this to 0.002–0.003mm. If you tend to barely touch the surface, drop to 0.001mm.
The Formula Behind the Math
The math treats the candy shell as the volume between two spheres:
shell volume = (4/3) × π × ((R_pop)³ − (R_center)³)
volume per lick = surface area × lick depth
= 4 × π × R_pop² × depth
licks needed = shell volume / volume per lick
For a standard pop (R_pop = 12.7mm, R_center = 5.0mm, depth = 0.0014mm):
That's a lot more than 252 or 411. But the academic studies used machines that drag fast and dry; real human licks remove more material per pass because saliva softens the candy. Adjust lick depth up to 0.005–0.008mm to land in the published 250–500 range.
Why the Numbers Disagree
Tips and Things to Watch Out For
Don't rush. Faster licking generates heat, melting the candy and removing more per lick. Slow, deliberate licks are what the studies measured.
Hydration matters. Dry mouth = less erosion per lick. The published numbers assume normal saliva production.
Center isn't a hard boundary. The transition from candy shell to Tootsie Roll is gradual. The "you reached the center" point is fuzzy by ±20–40 licks.
Frequently Asked Questions
How many licks does it take to get to the center of a Tootsie Pop?
Depending on the study, anywhere from 252 to 411. The Purdue team's 364 is the most commonly cited modern answer.
Did the 1970 commercial count correctly?
No. Mr. Owl licked three times then bit the pop. The narrator's "the world may never know" is the famous line, not Mr. Owl's count.
Why does this calculator give bigger numbers than the studies?
The default lick depth (0.0014mm) is the smallest published figure. Real human licks remove 2–4x more material per lick because saliva softens the candy. Bump lick depth to 0.005mm and you land near 800; bump to 0.008mm and you hit the Purdue-style ~500.
Are Tootsie Pops the same size as in 1970?
Roughly. Tootsie Industries says the formula and form factor have been stable since the 1930s. Modern factory tolerances are tighter, but a standard pop is still ~1.0 inch.
Is this serious?
It's a meme calculator, but the math is real. Use it to settle bar bets, not to publish papers.