A grinning young scientist in goggles raises a fist over a bubbling green flask as villagers and stone statues look on.

Original artwork, not a still

Senku Ishigami

Ten billion percent!

— Dr. Stone · 2019

Behind the line

What it means

Our interpretation.

The joke is that a boy who trusts only numbers rounds his certainty up to a figure no experiment could ever produce. It is confident, a little arrogant and usually right, which is exactly Senku, and it shows the faith in evidence that drives the whole series. Fans use it for any bold prediction, from exam results to a speedrun, as a deliberately over-the-top stamp of certainty.

Context reviewed

In context

Spoilers for Dr. StoneShow the scene

It is Senku Ishigami's way of saying he is certain, and the phrase is there from the very first chapter. On the last ordinary day before everyone on Earth is turned to stone, Taiju tells his friend that he will confess to Yuzuriha at last; Senku offers a love potion that supposedly has a ten billion percent chance of working and assures him that his success is ten billion percent assured. The potion is really gasoline made from plastic, and Senku is ten billion percent sure Taiju would never take the easy way out. The anime opens with the same scene in "Stone World" (Japan 5 July 2019). Senku keeps the phrase afterwards, along with "not one millimeter" and "Get excited!", for each moment when science settles a question.

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