# Time series formula

In the formula box, use any of the assigned plot variable names to type in a mathematical formula returning a numerical value.

* Basic arithmetic operations are supported (multiplication, division, addition, or subtraction, for example), along with more complex mathematical expressions.
* Quiver’s autocomplete will suggest built-in functions along with existing series based on parameter name or series properties.
* Quiver uses a custom mathematical expression language for formulas. More details about supported expressions are available in the [formula documentation](../cards-formula-syntax/index.md).
* The Object selector is optional and must only be filled out when using the '@' symbol to reference properties.

[Learn more about how interpolation affects this operation.](../cards-interpolation-usage/index.md#time-series-formula)

## Input type

Time series

## Output type

Time series

## Examples

![TS formula example](../../../assets/694b132bda5d5204dc60e848ad98664e755d340dd9dfe5d1daaab3c54901d47c.webp)

## Usage information

| Functionality | Availability |
| --- | --- |
| [Standard Quiver card](../core-concepts/index.md#cards) | Supported |
| [Transform table transform](../cards-transform-table/index.md) | Supported |