# Monster carrying capacity

A monster's carrying capacity is calculated based on its weight or size relative to a human.[1]

## Weighty monsters

If the monster has non-zero weight, its carrying capacity is

$\frac{{1000 \times \text{monster weight}}}{\text{weight of human}} (\times \frac{1}{2} \text{if not strong})$.

The weight of a human is 1450 for this calculation.[2] If a strong monster would have less than 1000 carrying capacity based on this calculation, then its carrying capacity is set to 1000.

This can be simplified to $\frac{\text{weight}}{2.9}$ if the monster is not strong, and $\frac{\text{max}(\text{weight}, 1450)}{1.45}$ if the monster is strong.

Some monsters have special rules for their carrying capacity:

## Weightless monsters

If the monster has zero weight, its carrying capacity is

$\frac{1000 \times \text{monster size}}{\text{size of human}} (\times \frac{1}{2} \text{if not strong})$.

The numerical value used for monster size is that used for physical size: 0 for tiny, 1 for small, 2 for medium, 3 for large, 4 for huge, and 7 for gigantic. Humans have medium (2) size.[5]

## Notes

Despite the source code comment mentioning corpseless monsters,[6] the formula based on monster size is only used for monsters with a weight of 0. Thus, a corpseless lich, with medium (2) size and 1200 weight, uses the formula for weighty monsters and has a carrying capacity of 413, not 500. A wraith, with medium size and 0 weight, uses the formula for weightless monsters and has a carrying capacity of 500.

## Examples

Monster Weight Strong? Size Carrying capacity
kitten 150 No 1 (small) 51
housecat 200 No 1 (small) 68
large cat 250 Yes 1 (small) 1000
little dog 150 No 1 (small) 51
dog 400 No 2 (medium) 137
large dog 800 Yes 2 (medium) 1000
pony 1300 Yes 2 (medium) 1000
horse 1500 Yes 3 (large) 1034
warhorse 1800 Yes 3 (large) 1241
lich 1200 No 2 (medium) 413
wraith 0 No 2 (medium) 500
air elemental 0 Yes 4 (huge) 2000
mind flayer 1450 No 2 (medium) 500
Archon 1450 Yes 3 (large) 1000
dragon 4500 Yes 7 (gigantic) 3103

## References

1. src/mon.c in NetHack 3.6.6, line 1294: The function returns before the nymph's actual carrying capacity is checked.