Market Sizing Calculator

Help me estimate the market size for [PRODUCT/SERVICE]:

Product/Service: [DESCRIPTION]
Geography: [MARKET]
Customer type: [B2B/B2C]
Primary use case: [HOW IT'S USED]

Calculate using both approaches:

**Top-Down:**
- Total addressable market (TAM)
- Serviceable addressable market (SAM)
- Serviceable obtainable market (SOM)

**Bottom-Up:**
- Number of potential customers
- Average deal size/purchase frequency
- Achievable penetration rate

Show all assumptions clearly. State confidence level for each estimate. Identify the biggest uncertainties.