How many questions can you miss on the LSAT?

That conversion is set per form. A slightly harder form converts a given raw score to a slightly higher scaled score, which is the whole point — it is what makes a score from one administration mean the same as a score from another.

What you can rely on

The scored questions come from two Logical Reasoning sections and one Reading Comprehension section, so a scored test is somewhere in the seventy-five to eighty question range. The unscored section does not count toward it.

And the direction is fixed even when the exact conversion is not: fewer misses is always a higher score, and the misses get more expensive as you climb. Near the top of the scale a single question can move the reported score; in the middle it often does not.

Count raw, not scaled

This is the practical takeaway. When you review a practice test, work in questions missed rather than in scaled score. The raw count is what you actually did; the scaled score is that count run through a conversion that will be different on test day.

Tracking raw also makes progress legible. A run of scaled scores that looks flat can hide a raw count that has been falling steadily, because the tests were not equally difficult.

And do not aim at a miss budget

Planning to miss a specific number is a strange way to take a test, and it produces bad in-section decisions — abandoning a question you would have got because you have "spent" your allowance, or grinding one because you have not.

Which is the other reason to hold this loosely. A one- or two-question difference near your target is inside the measurement error LSAC itself publishes. Answer every question, spend your time where it is winnable, and let the conversion do what it does.