# Klitzing Constant

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

## klitzing

Von Klitzing constant

Try it yourself:

```calculio
klitzing
```

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## Von Klitzing constant: quantum Hall resistance

**klitzing** is the von Klitzing constant, Rₖ = h/e², approximately 25.8 kΩ. It characterizes quantized Hall resistance and provides a precision resistance standard.

## Physics context

It combines the [Planck constant](https://calcul.io/constants/planckConstant/index.md) and elementary charge in quantum electrical metrology. Use [to()](https://calcul.io/function/to/index.md) to express the result in ohms and [format()](https://calcul.io/function/format/index.md) for reports.

## Caveat

Use the constant symbolically or with adequate precision; rounded values are unsuitable for standards work.

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