In Banished, stockpiles range in sizes from 2 x 2 to 10 x 10. The capacity is determined by the weight of the items. The material weights are as given below
| Material Weight Units |
| Firewood | 4 |
| Logs | 11 |
| Stone | 15 |
| Coal | 15 |
| Iron | 25 |
If you'd like the unit weights of other Banished items, you can see
the post on Building Storage Capacities.
After the jump, I provide tables showing the ultimate weight capacity based on stockpile size as well as storage capacities of a firewood only, log only, stone and/or coal, and iron only stockpiles.