Google·Product Manager·Onsite - Product Sense / Strategy·Intermediate

Intermediate

Jun 2026

Summary

PM interview at Google with a market sizing question about Hershey's chocolate bar sales in the US. Pretty standard estimation exercise but it still made me sweat.

Questions Asked (1)

Estimate how many Hershey's chocolate bars were sold in the US in the past year.

Product Analytics & MetricsProduct Sense & Ideation

Author's notes

I started top-down with US population, segmented by age groups and rough purchase frequency, then sanity checked against total candy market size.

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Suggested Approach

Break the problem into a demand-side estimation using the US population, segmenting by consumption frequency (e.g., heavy, moderate, light users) and average bars per user per year. Then validate with a supply-side check using Hershey's annual revenue and average price per bar.

Pro tip: State your assumptions clearly and round numbers to simplify calculations; interviewers care more about your structured thinking than the exact number. After estimating, mention that you'd sanity-check with industry reports or company financials.

1. Clarify the scope

Confirm that the question refers to all Hershey's chocolate bars (not just the classic milk chocolate bar) and that 'past year' means the most recent 12 months. Ask if you should include all retail channels (grocery, convenience, online, etc.).

2. Segment the US population

Divide the US population (~330 million) into age groups or consumption segments. For simplicity, use age groups: children (0-17), adults (18-64), and seniors (65+). Estimate the number of people in each group who consume Hershey's bars.

3. Estimate consumption frequency and quantity

For each segment, estimate the percentage who consume Hershey's bars and their average annual consumption. For example, assume 80% of children eat 20 bars/year, 60% of adults eat 10 bars/year, and 30% of seniors eat 5 bars/year.

4. Calculate total bars

Multiply the population in each segment by the penetration rate and average annual consumption, then sum across segments to get the total estimated bars sold.

5. Sanity-check with supply-side data

Cross-check your estimate using Hershey's US confectionery revenue (e.g., from annual reports) divided by the average retail price per bar. If the numbers are within a reasonable range, your estimate is plausible.

Key Points to Mention

Use a top-down approach starting with the US population and segmenting by age or consumption behavior.
State assumptions explicitly (e.g., penetration rates, average bars per consumer per year) and keep numbers easy to calculate.
Consider seasonality (e.g., Halloween, holidays) and its impact on annual sales.
Account for different package sizes (single bars vs. multi-packs) and how that affects the count of 'bars'.
Validate with a bottom-up check using Hershey's revenue and average price per bar.
Acknowledge that the estimate is rough and suggest ways to refine it with real data.

AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.