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Market Share Calculator

Calculate your market share from your sales and total market sales, in revenue or units. Add your largest competitor for relative market share and last period's numbers for the change in points, or paste a list of companies to get every share plus the HHI concentration index.

Last updated:

Calculate for

All sales in the market for the same period.

For relative market share. If you are the leader, enter the next largest.

%

If larger than the list, the rest counts as 'Others'.

Enter your values to see the result.
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How to use the Market Share Calculator

  1. Choose a mode: your own company, or a list of several companies.
  2. Enter your sales and total market sales for the same period, in money or units.
  3. Add your largest competitor for relative market share, and last period's figures to track the change.
  4. In list mode, paste one company per line as Name: sales, and add the total market if the list is incomplete.
  5. Read the share, relative share and HHI, then copy the summary or download the table.

Market share formulas

  • Market share % = company sales ÷ total market sales × 100
  • Relative market share = company sales ÷ largest competitor's sales
  • Change in share = current share − previous share (percentage points)
  • Sales needed for a target share = total market × target % − current sales
  • HHI = Σ (market share in %)²
  • CR4 = combined share of the four largest companies

Example: your company sells $2.5M in a $40M market, so its share is 6.25%. The largest competitor sells $9M, so relative market share is 2.5 ÷ 9 = 0.28×. Last year you sold $2.1M of $37M (5.68%), a gain of 0.57 points.

Reading the HHI

HHIMarket structure (2023 US Merger Guidelines)Example
Below 1,000UnconcentratedTen equal firms: 10 × 10² = 1,000
1,000 – 1,800Moderately concentratedSix equal firms: about 1,667
Above 1,800Highly concentratedFour equal firms: 2,500
10,000MonopolyOne firm with 100%

The HHI should include every company in the market. If your list leaves out many small firms, the index shown is a close lower bound, because small shares add very little when squared.

Tips for accurate market share

  • Define the market first. Your share of "running shoes in the US" is very different from your share of "footwear worldwide".
  • Use the same period and currency. Compare annual sales with annual market size, and convert currencies at a consistent rate.
  • Watch share and growth together. A rising share in a shrinking market and a falling share in a booming market call for different strategies.

Frequently asked questions

How do you calculate market share?

Market share = your company's sales ÷ total market sales × 100, for the same period and the same market definition. For example, $2.5 million of sales in a $40 million market is a 6.25% market share.

What is relative market share?

Relative market share compares your sales with your largest competitor's: your sales ÷ the largest competitor's sales. A value above 1 means you are the market leader; for the leader, it is usually calculated against the next largest company. It is the measure used in the BCG growth-share matrix.

Should I use revenue or units?

Both are valid. Revenue share reflects pricing as well as volume, while unit share shows how many products customers actually choose. Premium brands often have a higher revenue share than unit share.

How is a change in market share expressed?

Usually in percentage points: going from 5.68% to 6.25% is a gain of 0.57 points. Your share can rise even if your sales fall, as long as the total market shrinks faster.

What is the HHI?

The Herfindahl-Hirschman Index is the sum of the squared market shares (in percent) of the companies in a market, ranging up to 10,000 for a monopoly. Under the 2023 US Merger Guidelines, markets with an HHI above 1,800 are considered highly concentrated.

Where do I find total market size?

Common sources are industry association reports, government statistics, public company filings and market research firms. Make sure the market definition (product category, region and period) matches the sales figure you compare it with.

Are all the tools on FreeToolCabin tested for quality and accuracy?

Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.

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