> For the complete documentation index, see [llms.txt](https://guide.laevitas.ch/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.laevitas.ch/concepts/volume.md). # Volume {% hint style="info" %} **Volume denotes the number of options or futures that are traded.** There are separate volume figures for options and for futures. {% endhint %} ### **How Volume Is Calculated** Volume accounts for opening and closing transactions. When options are bought or sold, it **adds** to the volume traded for the day. ### ### **Difference between Volume and Open Interest** For example, If an option buyer goes to the market and buys 200 call options, the volume for the day is 200 and the Open Interest becomes 200 as well. If in the same day, a new seller goes to the market and sells 150 put options, the total volume for the day is 350 and the Open Interest becomes 350. If before the end of the day, both the buyer (sell to close) and the seller (buy to close), the volume added will be 350 from the buyer (+200) and seller (+150). Total volume becomes 400+350 = 750. Since there are no longer any opened and not yet closed positions, Open Interest therefore becomes 0 as far as these two market participants are concerned. ### **Why Volume Matters** The more an option or derivative is being traded, the more buyers and sellers there are, which usually results in tighter bid-ask spreads. The more activity there is, the more we can assume there is an agreement on a fair price. Related Metrics:\ [Global Perps Volume](https://app.laevitas.ch/details/gm_volume?variant=Volume\&subInfo=c)\ [Global Futures Volume](https://app.laevitas.ch/details/gm_volume_future?variant=Volume\&subInfo=c\&type=future)\ [Global Options Volume](https://app.laevitas.ch/details/global_HoiBreakDownByCurrency?variant=oi)