What EA actually documents about the merge
The Cross Progression section of EA's Apex Legends FAQ is specific about several things. The game auto-selects a primary profile—the account with the highest Account Level, with the most recently played platform breaking ties—and that profile becomes your only profile going forward. Stats carry over from the primary profile only; stats on other profiles are not merged. Cosmetics you own across platforms are combined, apart from platform-exclusive content, and unopened Apex Packs are merged into the single profile. Currencies are merged too, with documented exceptions around Nintendo Switch balances, and some stat-tied legacy items (such as certain badges) may not survive the merge at all.
What is public and what is not
Notice what that list does not contain. EA documents how unopened packs and owned items combine, but publishes nothing about how opened-pack history is treated—and the Heirloom guarantee runs on exactly that history. There is no official statement that pre-merge eligible-pack counts add together, that the higher count wins, or that the counter restarts. There is also no player-facing endpoint that exposes the counter before or after a merge. Any calculator that outputs a single post-merge pack count is therefore inventing a rule that no public source states.
Do not add platform estimates
If one pre-merge estimate says 180 packs and another says 260, adding them to produce 440 assumes that both histories transfer directly into one hidden guarantee counter. Choosing 260 assumes a “higher counter wins” rule. Neither operation is established by the public sources used here.
Preserve a before-and-after record
- Save each platform's account-level, Battle Pass, purchase, and pack evidence separately.
- Record the merge date and the primary account selected in EA's process.
- Keep uncertain pack types outside the confirmed eligible total.
- After the merge, start a new evidence log and do not retroactively manufacture an exact counter.
Use a range when evidence is incomplete
A minimum supported count can include only confirmed eligible packs. A separate maximum can include unresolved rewards, but it must not drive the guarantee progress bar. This is less satisfying than a single exact number, but it accurately reflects the available evidence.
What remains stable across platforms
EA publishes one global Heirloom Shards rate—a documented minimum of 0.045% per eligible standard pack—not separate PC and console values. The 500-eligible-pack guarantee and the same exclusions (Collection Event, Thematic Event, Milestone Event, Collection Retro, and replacement-item packs do not count) apply to the LootCalc model regardless of where you play. The only input that model accepts is the number of eligible packs opened since you last received Bonus Heirloom Shards, because that is the only quantity a player can actually observe. It never derives that number from a lifetime total, and it never infers a reset event—after a merge, those inferences are exactly the arithmetic the public record does not support.