How Much Would You Pay for Snapchat?

Spend some time trying to calculate the worth of a high-flying startup, and your head will start hurting.

Pick a number.

Photographer: Kevork Djansezian/Getty Images)

What is Snapchat worth? Well, if the purveyor of disappearing photos and videos succeeds in attracting a new funding round of $500 million, and gets those new investors to settle for 2.6 percent of the company, it will be worth $19 billion -- just like Xiaomi and Uber, two startups with even higher valuations, are worth $45 billion and $41 billion, respectively.

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