Market Share Calculator
Growth that matches the market is the tide.
Market share
3.42%
3.86% next year at these rates
Growing faster than the market means share gain — 0.44% of it. Growth that merely matches the market is not a commercial achievement, it is the tide.
How the Market Share Calculator works
Growing at the market's rate is not a commercial achievement; it is the tide. Share is gained only by growing faster than the category, and a business can post record revenue while quietly losing position.
Not financial advice. Marketplace fees change, and they vary by country, plan and seller status. Every rate here is an editable default, not a quoted price — check the platform's current fee schedule before you price a product against it. This is not tax or business advice.
Frequently asked questions
How is market share calculated?
Your revenue divided by total market revenue. The hard part is the denominator — most market size figures are estimates with wide error bars.
Why compare growth rates?
Because share changes only when your growth differs from the market's. Twenty percent growth in a market growing thirty percent is share loss dressed as success.
What is relative market share?
Your share divided by the largest competitor's. It measures competitive position rather than absolute size, and it correlates better with pricing power.
How do I estimate market size?
Industry reports, category data from retailers, or building bottom-up from population and penetration. All three disagree, which is why share trends matter more than share levels.