* 0.4 meters (m)

* 15.748 inches (in)

* 1.312 feet (ft)

It's important to note that "how much" can be interpreted in different ways. The above conversions are for length or distance.

If you meant "how much" in terms of volume or weight, you'd need more information about what 40 cm refers to. For example:

* 40 cm³ (cubic centimeters) is a measure of volume.

* 40 grams (g) is a measure of weight.

Please provide more context if you're looking for a different type of conversion.