I’ve been reading through the Angry GM’s stuff, particular his megadungeon series, and couldn’t help but think about how his spreadsheets for encounters per level per dungeon section might line up with the various Pathfinder adventure paths. That led me down a thrilling couple of hours banging away at a giant spreadsheet of my own comparing the encounters in an AP to the various XP and wealth progressions. I’ll start off with the rules of thumb, and get into some wonkery explaining my work afterward.

Converting Modules

First off, the bad news: there’s no 1:1 enemy conversion available.

There’s no way that 5e, with one Monster Manual, Volo’s, and a few other sources could approach the mass of opponent options in (at current count) six bestiaries, bonus monsters in every AP volume, multiple guides with NPCs, and the ability to attach class levels and templates to things. But even if they could, the math of 5e is just different for encounters than Pathfinder. For example, Pathfinder considers 12 zombies a level 6 encounter, while 5e considers them a level 5 encounter (and awards XP like a level 3 encounter, because 5e adds a difficulty premium for lots of monsters taking actions).

So you’re going to have to basically rebuild every encounter in the AP with the closest equivalents (of existing monsters or ones you custom make) that meet a new XP target.

But at least the math for doing so is relatively straightforward, since the expected encounters per level in Pathfinder is not that far off from the expectation in 5e.

Most Pathfinder adventure path modules include a target CR at the start of every room or encounter, which may be made up of multiple enemies of lower CRs within the text itself. Simply rebuild the room as a medium encounter of that level. Remember to apply the correct multiplier for multiple opponents.

For treasure awards:

  • Convert most magic items to their cash value (possibly as art) or consumables.
  • Grant half of all of the cash (including that from converted items). For example, if the encounter has printed loot of 100 gp, 300 sp, and a 500 gp value item, it instead gives 50 gp, 150 sp, and a 250 gp value art object (or consumables).
  • Only the most interesting magic items get converted to 5e equivalents. For those, try to give them a value equal to half their Pathfinder value based on the rarity values on page 135 of the 5e DMG. For example, a +3 equivalent shield is worth around 9,000 gp in Pathfinder, so gets translated to a strong Rare item or a weak Very Rare item in 5e (which, in this instance, checks out).

Expected Equivalencies

While the XP awards keep 5e characters within spitting distance of Pathfinder characters, it’s not perfect. In particular, 5e‘s first two levels go by much faster than Pathfinder‘s, while fifth level lasts much longer.

You can expect that:

  • Player characters will hit 2nd level significantly sooner than the AP intends, and will hit 3rd level around the time the AP planned for them to hit 2nd level.
  • They’ll be around a level ahead at all times until the module expects them to hit 5th level.
  • At that point, it starts to swing a little bit, but the PCs will usually be a few encounters behind where the AP expects them to be until 12th level.
  • They hit 12th level at pretty close to the exact right spot, then are close to in sync for the next couple of levels.
  • They pull ahead at 15th, and will pull further and further ahead as time goes on, to the point of hitting 20th level when a Pathfinder character would be early in 18th level. For most APs this won’t matter much, but you might want to pull back encounter budgets further past 15th level (or feel more free to skip non-plot-critical encounters).

The Wonkery

I made a long sheet with every encounter from the Mummy’s Mask AP, with a running total of XP per party member (for a four member-party) and a level lookup to make sure that the awards tracked where the modules suggested they should be. They did, and were usually pretty damned precise (almost as if the APs are created by carving up each level as an XP budget for each section of each module…).

Initially, I looked at just handing out 2/3 of the Pathfinder budget for each encounter, and that tracked as well or better until 10th level, when the XP charts diverge too much. Converting the encounter’s CR from the module to an equivalent 5e encounter somewhere between Easy and Medium created the best correspondence with the easiest-to-remember and process rule of thumb. By just targeting Medium, but assuming that there will be an overall loss of XP because of the difficulty multiplier for multiple enemies, it should be easy to remember how to convert without having to do any averaging yourself.

For treasure, I did a much less thorough comparison, and just looked at the stated Pathfinder wealth by level compared to the expected cash equivalent 5e income derived in this thread. I noted the suggested starting magic items for higher-level characters on page 38 of the DMG, and assumed those were relatively close to what you’d be expected to find in play, adding their value to the cash totals (it winds up only counting for about 15%).

The comparison of Pathfinder to 5e wealth has a ton of swing in it, but it gets pretty close to 50% for the last two tiers. Functionally, for the first tier the PCs will find a lot more wealth than the DMG expects (since Pathfinder frontloads more treasure), but there shouldn’t be a big enough difference by 7th level to justify a more complicated method of recalculating the AP’s treasure. It’s already going to be annoying enough to look up the value of minor magic items to turn them into cash prizes. Since I didn’t look super deeply at how the APs award magic items, I imagine that figuring out what to convert to cash and what to replace with a 5e equivalent will be more art than science.