Market Share Calculator

Market share measures what percentage of total industry sales a specific company or product captures.
It is one of the most fundamental competitive metrics in business strategy, used to assess competitive position, track growth, and benchmark against rivals.

Market share formula: Market Share (%) = (Company Sales ÷ Total Market Sales) × 100

Where:

• Company Sales: the company’s revenue or unit sales during the measurement period
• Total Market Sales: total industry revenue or unit sales in the same period and geography
• The result is a percentage: ranging from near 0% (niche player) to near 100% (monopoly)

Volume market share (units) vs. value market share (revenue):

• Unit share = (Company Units Sold ÷ Total Market Units) × 100
• Value share = (Company Revenue ÷ Total Market Revenue) × 100
• These can differ significantly if the company sells premium or budget products vs. the market average

Market share change formula: Share Change = Current Share − Prior Period Share

Relative market share (vs. largest competitor): Relative Share = Company Share ÷ Largest Competitor Share

• Ratio > 1.0 means you are the market leader
• Ratio < 1.0 means a competitor is larger

Industry market share benchmarks:

• Monopoly/dominant: > 50%
• Market leader: 25–50%
• Strong challenger: 15–25%
• Niche player: 5–15%
• Minor player: < 5%

Worked example: The global smartphone market sold 295 million units in Q3. Samsung sold 60 million units; Apple sold 57 million units.

• Samsung market share = (60 ÷ 295) × 100 = 20.3%
• Apple market share = (57 ÷ 295) × 100 = 19.3%
• Samsung relative share vs. Apple = 20.3 ÷ 19.3 = 1.05 (Samsung is the leader, barely)

A 1% swing in market share in this market represents 2.95 million units. That is why a single percentage point is worth fighting over in a large market and barely worth measuring in a small one.

Enter your own revenue and the total market and the calculator returns your share, the revenue still sitting with everyone else, and where you land on the benchmark scale above. It works just as well with unit sales as with revenue, as long as both boxes hold the same kind of number.