You cannot calculate the volume of an object if only the mass is given. This is because the volume of an object depends on both its mass and its density. Density is defined as the mass per unit volume, so in order to calculate the volume of an object, you need to know both its mass and its density.

Here is the formula for calculating the volume of an object:

```

Volume = Mass / Density

```

where:

* Volume is measured in cubic meters (m³)

* Mass is measured in kilograms (kg)

* Density is measured in kilograms per cubic meter (kg/m³)

If you only know the mass of an object, you can estimate its volume by using a known density value for a similar object. However, this is not an exact method, and the actual volume of the object may be different from the estimated value.