Manuel Castro Net Worth (Estimated)

Who is Manuel Castro?

Manuel Castro is a Y Combinator founder known for his work with Napkin Math, a platform that provides resources for startups.

Highlights:

• Stanford University
• Sequoia Capital
• TechCrunch Disrupt

About Napkin Math

Napkin Math is the personalized AI food journal that people love to use. We gamify nutrition tracking so people are 2x more likely to stick with us than other trackers. Claire, Manuel, and I (best friends for 10 years from MIT) are obsessed with how we can make nutrition fun, and turn fun into health outcomes.

=== Existing consumer health apps focus on scaling a one-size-fits-all solution: calorie deficits. But...

Model inputs

• Stage: seed
• Valuation tier: fallback-seed
• Valuation note: [scale: $500k-class amount looked like a YC check, not a published seed]
• Funding source: https://fundediq.co/napkin-math-napkinmath-club-funding/

FAQ: Manuel Castro net worth and Napkin Math valuation

What is Manuel Castro's net worth?

Manuel Castro's estimated net worth / paper wealth is $6.7M (range $4.7M–$10.0M) as of 2026. Entrepreneurial Check publishes an independent model-based estimate from public company and role data.

Manuel Castro net worth

Manuel Castro's estimated net worth / paper wealth is $6.7M (range $4.7M–$10.0M) as of 2026. This Manuel Castro net worth figure is estimated paper wealth, not a verified statement of assets.

How much is Manuel Castro worth?

Manuel Castro's estimated net worth / paper wealth is $6.7M (range $4.7M–$10.0M) as of 2026. How much Manuel Castro is worth here means estimated paper wealth from public company and role data — not financial advice.

How rich is Manuel Castro?

Manuel Castro's estimated net worth / paper wealth is $6.7M (range $4.7M–$10.0M) as of 2026. “How rich is Manuel Castro” here means estimated paper wealth from public company and role data — not verified net worth or financial advice.

Manuel Castro fortune

Manuel Castro's estimated net worth / paper wealth is $6.7M (range $4.7M–$10.0M) as of 2026. This Manuel Castro fortune figure is estimated paper wealth only, not a verified statement of assets.

Manuel Castro equity value

Manuel Castro's estimated net worth / paper wealth is $6.7M (range $4.7M–$10.0M) as of 2026. Manuel Castro equity value on this page is modeled paper wealth from estimated ownership — not a disclosed cap table or verified net worth.

What is Napkin Math valuation?

Napkin Math's estimated valuation on Entrepreneurial Check is $20.0M. Independent model output, not a verified appraisal or official mark.

What is Napkin Math post-money valuation?

Napkin Math's estimated valuation on Entrepreneurial Check is $20.0M. That figure is a modeled post-money mark when a public raise is available — not a verified appraisal or official mark.

What is Napkin Math funding?

Napkin Math funding, when a public raise is available, is a model input on this Entrepreneurial Check profile. How much Napkin Math raised is not a complete cap table — figures are estimates only.

How much did Napkin Math raise?

How much Napkin Math raised, when disclosed, informs the estimated Napkin Math valuation and founder paper-wealth figures on this page. Independent estimate only — not a complete cap table or financial advice.

How much money did Napkin Math raise?

How much money Napkin Math raised, when a public figure is available, is a model input for the estimated Napkin Math valuation on this profile. Estimates only — not a complete cap table.

What is Napkin Math series funding?

Napkin Math series funding, when a public raise is disclosed, informs the estimated Napkin Math valuation here. Not a complete financing history.

What company is Manuel Castro building?

Manuel Castro is Founder at Napkin Math, a Y Combinator-backed startup (batch P26).

What does Napkin Math do?

Napkin Math — AI nutrition coach in your pocket

What YC batch is Manuel Castro from?

Manuel Castro is associated with Y Combinator batch P26.

Where did Manuel Castro go to school?

Public profiles associate Manuel Castro with Stanford University.

What other companies is Manuel Castro connected to?

Public associations for Manuel Castro include Napkin Math, Sequoia Capital.

Where is Manuel Castro based?

Public directory data lists Manuel Castro's region as United States of America.

What industry is Manuel Castro in?

Manuel Castro is listed under Consumer.

How big is Napkin Math?

Public data lists Napkin Math's team size as 3.

What else is notable about Manuel Castro?

Stanford University.

Is Entrepreneurial Check affiliated with Y Combinator?

No. Entrepreneurial Check is an independent informational site and is not affiliated with, endorsed by, or sponsored by Y Combinator or the profiled companies.