Methods, systems, and devices for block conversion to preserve memory capacity are described. A device may perform a quantity of one or more access operations on a block that includes a set of memory cells configured as single-level cells each of which is configured for storing multiple bits. After performing the quantity of one or more access operations on the block the device may convert the set of memory cells from single-level cells into multiple-level cells configured for storing multiple bits. The device may then determine a remaining quantity of access operations permitted to be performed on the block and operate the bloc based on the remaining quantity of access operations.