# Molar Mass Constant

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

## molarMass

Molar mass constant

Try it yourself:

```calculio
molarMass
```

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## Molar mass constant

**molarMass** is the molar mass constant, connecting atomic-scale mass units with mass per amount of substance.

## Use

Use it with [Avogadro’s constant](https://calcul.io/constants/avogadro/index.md) and [carbon-12 molar mass](https://calcul.io/constants/molarMassC12/index.md). Convert laboratory quantities using [to()](https://calcul.io/function/to/index.md) and combine values with [multiply()](https://calcul.io/function/multiply/index.md).

## Caveat

Do not substitute it for a compound’s actual molar mass.

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