Definition
Trading volume is the total value of an asset traded during a set period, most often the past 24 hours, usually shown in US dollars and added up across the markets where the asset trades.
How it works
Every trade has a buyer and a seller, and volume adds up the value of those trades. On crypto data sites, the 24-hour volume is the sum across the exchanges and trading pairs a provider tracks, converted into one currency. Providers track different sets of markets, so the same coin can show different volume figures. For stocks, volume is often reported as the number of shares traded rather than their dollar value.
Volume shows how actively an asset is traded. A rough gauge is the ratio volume ÷ market cap: a higher ratio means a larger part of the asset's value changes hands each day. Sudden jumps in volume often come with news, sharp price moves or large holders moving funds, and traders use volume to judge whether a price move has broad participation.
Volume has limits. It can be inflated by wash trading, where the same party buys from and sells to itself to create the look of activity, so very high figures on small or unfamiliar markets deserve caution. Volume is also not the same as liquidity. Liquidity is how much can be traded right now without moving the price, which depends on the order book, while volume only counts trades that have already happened.
Example (hypothetical numbers)
Suppose Coin A trades on three markets, with 24-hour volume of $30,000,000, $15,000,000 and $5,000,000.
Total 24-hour volume = $30,000,000 + $15,000,000 + $5,000,000 = $50,000,000.
With a market cap of $1,000,000,000, volume ÷ market cap = $50,000,000 ÷ $1,000,000,000 = 5%.
Coin B has the same $50,000,000 volume but a market cap of $100,000,000, a ratio of $50,000,000 ÷ $100,000,000 = 50%.
The same volume means very different activity relative to size, and an unusually high ratio is a reason to check for wash trading.
Common mistakes
- Treating high 24-hour volume as proof that a large order can be filled without moving the price.
- Taking reported volume at face value without considering wash trading.
- Comparing volume figures from providers that track different sets of markets.
- Reading a volume spike as a sign of price direction, when it only shows activity.
Related calculators
This glossary is for education only and is not investment advice. Examples use hypothetical numbers.