# LOG10E Constant

Use LOG10E in Calcul.io. See what this built-in constant represents, enter it in an editable calculation, and review related values and units.

## LOG10E

Try it yourself:

```calculio
LOG10E
log(e, 10)
```

---

## LOG10E: base-10 logarithm of e

**LOG10E** is log₁₀(e), the conversion factor from natural logs to base-10 logs.

## Use

Multiply [log()](https://calcul.io/function/log/index.md) results by LOG10E to obtain base-10 values, or call [log10()](https://calcul.io/function/log10/index.md) directly. [LN10](https://calcul.io/constants/LN10/index.md) is the reciprocal conversion factor.

## Caveat

Real logarithms need positive inputs; retain exact constants until formatting with [format()](https://calcul.io/function/format/index.md).

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