# LOG2E Constant

Use LOG2E in Calcul.io. See what this built-in constant represents, enter it in an editable calculation, and review related values and units.

## LOG2E

Try it yourself:

```calculio
LOG2E
log(e, 2)
```

---

## LOG2E: base-2 logarithm of e

**LOG2E** is log₂(e), a conversion factor useful in binary information and exponential models.

## Use

It converts [log()](https://calcul.io/function/log/index.md) results to base 2. Use [pow()](https://calcul.io/function/pow/index.md) for inverse exponent relations and [LN2](https://calcul.io/constants/LN2/index.md) for the reciprocal conversion.

## Caveat

Use it as a dimensionless constant, and validate real log inputs with [isPositive()](https://calcul.io/function/isPositive/index.md).

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