# True Constant

Use True in Calcul.io. See what this built-in constant represents, enter it in an editable calculation, and review related values and units.

## true

Try it yourself:

```calculio
true
```

[false](https://calcul.io/constants/false/index.md)

---

## True: the Boolean truth value

**true** is the Boolean constant representing a satisfied logical condition. It is used in comparisons, conditional expressions, and filters.

## Use

Comparisons such as [equal](https://calcul.io/function/equal/index.md) return true or false. Combine true with [and](https://calcul.io/function/and/index.md), [or](https://calcul.io/function/or/index.md), and [not](https://calcul.io/function/not/index.md) to form conditions.

## Caveats

True is logical, not the numeric value one, even if a context performs coercion. Use [false](https://calcul.io/constants/false/index.md) for the opposite constant and make Boolean tests explicit in data workflows.

[All constants](https://calcul.io/constants/index.md)