> For the complete documentation index, see [llms.txt](https://guide.plumber.gov.sg/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guide.plumber.gov.sg/user-guides/actions/calculator.md). # Calculator ### Perform a calculation Use this action to add, subtract, multiply, or divide two numbers. | Field | Description | Required? | | ------------------------- | ------------------------------------------ | --------- | | Number to transform | The first number in your calculation. | ✔️ | | Math operation to perform | Select Add, Subtract, Multiply, or Divide. | ✔️ | | Value | The second number in your calculation. | ✔️ | The output is stored as **Result**, which you can use in later steps. ### Round number Use this action to round a number to a set number of decimal places. | Field | Description | Required? | | --------------- | ------------------------------------------------------------------------------------------------------------------------------------ | --------- | | Number to round | The number you want to round. | ✔️ | | Rounding | Select Round Down (always rounds towards zero), Round Up (always rounds away from zero), or Round Off (rounds to the nearest value). | ✔️ | | Decimal places | The number of decimal places to round to. Enter a whole number. | ✔️ | The output is stored as **Result**, which you can use in later steps. ### Common errors
Ensure that you have entered valid numbers This error occurs when a field receives a value that isn't a number, for example a text string or an empty variable. Check that all fields contain numeric values. If you're using a variable, make sure the step it comes from is returning a number.