Glossary

Market sizing

Estimating the number of potential buyers or the sales value of a defined market over a stated period.

Why it matters

Before entering a new location or serving a new audience, you need a view of how much demand could exist. Market sizing makes the assumptions behind that opportunity visible so you can decide what deserves closer investigation.

Start with a clear customer, offer, geography and time period. You can narrow a published market total to your audience or build an estimate from potential buyers, purchase frequency and spend. Compare the approaches where useful and show which assumptions are uncertain.

A simple example

Illustrative example, not client research

Suppose a training company is considering an annual workshop for small employers in a particular region.

Estimate potential spending

If 500 eligible employers each bought one $1,000 workshop during a year, the annual sales value would be $500,000.

Check whether those employers have the relevant need, budget and buying responsibility rather than treating every eligible business as a likely buyer.

Separate reach from potential

Some employers may already use another provider, choose an internal option or be outside the company’s practical delivery area.

Estimate the portion you can realistically reach and serve, then consider sales capacity and delivery capacity when planning for the first year.

The numbers and purchase assumptions are hypothetical. The $500,000 figure is a scenario in which every eligible employer buys, not expected revenue. Test the assumptions and show a range where the evidence is uncertain.

Market size is not a revenue forecast

A market estimate describes potential demand within chosen boundaries. A revenue forecast adds assumptions about how many customers your business can win, when they will buy and what they will spend with you.

A large total does not establish that an opportunity is reachable or profitable. A smaller, well-understood audience can deserve more attention than a broad market with weak evidence of need or fit.

Before relying on a market estimate

Who counts as a potential buyer, and are any buyers counted more than once?
Which sources support the population, purchase frequency and spending assumptions?
How does the estimate change if demand, reach or willingness to pay is lower than expected?

Market share: A business’s portion of total sales in a defined market and period, measured by revenue or units sold.
Market segmentation: Dividing a market into groups with shared needs or characteristics, so you can decide whom to serve and how.
Customer research: Gathering and analyzing information about customers to understand their needs, behavior and experiences.