Calculate market share percentage, relative market share vs. competitors, and revenue opportunity from market share gains. Essential for competitive analysis and strategic planning.
Your revenue, the market, and the rival you are measured against
You and the market
$
Your total annual revenue in the target market.
$
Total annual revenue in your target market.
The largest competitor, and where you are aiming
$
Annual revenue of your largest competitor in this market.
%
A share goal — the calculator shows the extra revenue needed to reach it.
Your Market Share
10.00%
Your revenue as a percentage of the total market.
Formula verified 12 September 2026
Relative Market Share
0.33
Your revenue ÷ top competitor revenue. >1.0 means you lead; <1.0 means they’re ahead.
Top Competitor Share
30.00%
Top competitor’s market share percentage.
Revenue to Reach Target Share
$5,000,000
Additional revenue needed to reach the Target Market Share you set above.
Revenue at Target Share
$10,000,000
What the target share is worth in revenue at today’s market size — the gap above is this figure less your revenue.
How the market splits between you, your top competitor, and everyone else, using the revenue and market size you entered. Shares are each player’s revenue as a percentage of the total market. Same formulas as the calculator.
Player
Annual revenue
Market share
You
$5,000,000
10.00%
Top competitor
$15,000,000
30.00%
Rest of market
$30,000,000
60.00%
Total market (TAM)
$50,000,000
100.00%
Estimates only — not financial, tax, or professional advice.
100% private — every number you enter is calculated in your browser and never sent to our servers.
What it calculates: Your Market Share, Relative Market Share, Top Competitor Share, Revenue to Reach Target Share.
Updated 5 June 2026 · Transparent assumptions
10% of the market, but only a third of the leader — the second number is the one that predicts profitability
$5m of revenue in a $50m market is a 10% share. Set against a leader on $15m, relative market share is 0.33 — you are a third the size of the largest player. Absolute share describes your footprint; relative share describes your position, and decades of strategy research tie relative share far more closely to profitability than the absolute figure.
The reason is scale economics. A leader at three times your volume buys better, amortises fixed cost over more units, and can price below your cost floor while remaining profitable. Two businesses can both hold 10% of their markets and face completely different economics depending on whether the leader holds 12% or 45%.
Widen the definition and your share falls; narrow it and you lead
Total addressable market is a judgement, not a measurement, and market share inherits every assumption inside it. The same $5m business holds 10% of a $50m market, 5% of a $100m one, and 25% if the market is redefined to the segment it actually serves. None of those is wrong, and all of them are quotable.
That makes the definition the first thing to pin down and the first thing to challenge in someone else\u2019s figure. A defensible definition names the buyers who could realistically purchase from you — right geography, right segment, right product category — rather than every dollar spent in a broad industry. Consistency over time matters more than precision: a share series computed on a shifting definition tells you nothing.
Doubling share to 20% means finding $5m of revenue, not 10% more effort
A 20% target on a $50m market is $10m of revenue, and the gap from $5m is another $5m — the business has to double. Stating a share target in revenue terms is the fastest way to test whether it is a plan or an aspiration, because it converts a percentage into the sales capacity, marketing spend and delivery headcount that would actually be needed.
Where the $5m comes from matters too. In a growing market, share can be held while revenue rises, and gained simply by growing faster than the market. In a flat market every point of share must be taken from a competitor who will respond. The same target is a different project in each case.
A 10% share means something different against one rival than against forty
Market share says nothing about how the remaining share is distributed. Holding 10% against a single 30% leader and fifty small players is a different competitive position from holding 10% against three rivals at 30% each. Concentration measures such as the Herfindahl-Hirschman index exist to capture that, and they often explain pricing power better than share does.
Trend matters more than level. A 10% share rising from 7% over two years describes a business winning; the same 10% falling from 14% describes one losing, and the snapshot is identical. Track the series, and track it against market growth, so you can tell whether you are gaining share or simply floating on a rising tide.
Revenue share, one period, and market data you probably estimated
This computes share by revenue. Share by units, by customers, or by volume can differ sharply — a premium player can lead on revenue while holding a small unit share, and the right measure depends on what you are trying to argue. Pick one and state it.
Total market size is usually the weakest input. Analyst reports, trade associations and bottom-up estimates from customer counts can differ by a factor of two on the same market, and none is authoritative. Treat the share figure as accurate to the nearest few points, use the same source consistently, and be sceptical of any share claim whose denominator is not disclosed.
Sources & References
Figures on this page are checked against primary, authoritative sources. Links open in a new tab.
Results are estimates for planning and analysis based on the figures you enter. They are not accounting, tax, or financial advice — verify with your own records and a qualified professional before making decisions.
Published the calculator with its formula, worked example, assumptions, limitations and a bespoke guide, and added an automated formula test suite covering it.
Verified that relative market share compares against the named competitor rather than the market, and that the revenue gap to a target share reconciles to the target itself.
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