PE Mechanical exam pass rates — and what they actually tell you
Last updated: June 2026. Figures are from NCEES; the data refreshes roughly every July — re-check the current window before relying on a specific number.
Most first-timers pass the PE Mechanical exam — but a real share don't, and the data is worth reading closely before you plan your prep. The headline: the majority of first-time takers pass, the exam fails repeat takers far more often than first-timers, and the gap between those two groups is mostly about method, not ability. Here's the current data, by depth, straight from NCEES — and what it should change about how you prepare.
Pass rates by depth
Most recent published window (Jul–Dec 2025), with the full prior year in parentheses for context:
| Depth | First-time pass | Repeat pass |
|---|---|---|
| HVAC & Refrigeration | 69% (73% FY23–24) | 47% (51%) |
| Machine Design & Materials | 64% (67%) | 35% (45%) |
| Thermal & Fluid Systems | 71% (75%) | 39% (52%) |
Source: NCEES (Squared 2024 report; Jul–Dec 2025 window posted Jan 2026). The Jul–Dec 2025 figures are a half-year population and run a few points below the full-year numbers. NCEES refreshes this data ~July 2026 — re-check then.
Three things to take from this:
- Most first-timers pass — roughly two-thirds to seven-in-ten, depending on depth. If you prepare well, the odds are with you.
- It's not a formality, either — roughly a quarter to a third of first-timers don't pass. This is a real exam that rewards real preparation.
- Repeat takers pass at 35–47% — below a coin flip in two of the three depths. That gap is the most important number on this page, and the next section is why.
Why repeat takers do worse, not better
It's counterintuitive — you'd expect a second attempt, with the material fresh and the format no longer a surprise, to be easier. The reason it usually isn't: most people repeat the same preparation that didn't work the first time. More lectures, more re-reading, the same scattered problem practice. The score barely moves.
What actually moves it is changing the method — diagnosing exactly where the points were lost, then drilling those specific areas under exam-like conditions, instead of restarting at chapter one. The gap between first-time and repeat pass rates isn't a gap in ability. It's a gap in approach. (If you're planning a second attempt, that's the whole subject of the retake plan.)
Which depth is "hardest"?
By the numbers, Machine Design & Materials is the toughest on both counts — lowest first-time pass and lowest repeat pass — which tracks with its breadth (it's the widest-ranging depth). Thermal & Fluid Systems posts the highest first-time pass, with HVAC & Refrigeration close behind. But don't pick your depth by its pass rate: you should sit the depth that matches your work and fundamentals (which depth should you take?), because that's where your existing knowledge does the most work. A higher base rate won't help you on material you don't use. (How hard the exam really is.)
What "passing" actually means
NCEES scores the PE Mechanical exam against a scaled cut score set by subject-matter experts through a standard-setting process — not a curve against the other people who tested that day. There's no published passing score — no fixed percentage like "you need 70%" — and you're not competing against your cohort: everyone who meets the competency standard passes. So the goal isn't chasing a magic percentage — it's genuine mastery of the tested areas. (How the exam is built and scored.)
How to land on the right side of these numbers
The first-time pass rate isn't luck — it's the product of a method. The candidates who pass:
- diagnose their weak areas first and study those, instead of everything evenly;
- make exam-real problems the main event, returning to theory only on a miss;
- rehearse closed-book with the on-screen Handbook until navigation is automatic; and
- practice timed so pace holds for the full day.
That's the entire playbook in how to pass the PE Mechanical exam, with the method detailed in how to study.
See where you stand
The fastest way to find out which side of these numbers you're on is to start practicing the real thing — diagnose your weak areas and drill them under exam conditions. → Start your 7-day free trial — no card.
See also: how to pass the PE Mechanical exam · how hard is it, really · a retake plan that works.
FAQ
- What's the pass rate for the PE Mechanical exam?
- Most recently, **64–71% for first-timers** depending on depth, and **35–47% for repeat takers**. Most first-timers pass.
- Why do repeat takers pass at a lower rate?
- Because most retake with the *same* preparation that didn't work — the ones who pass change the method, not just the hours.
- Which PE Mechanical depth is hardest?
- By pass rate, **Machine Design & Materials**; **Thermal & Fluid Systems** is highest. But sit the depth that matches your work, not the one with the best number.
- Is the PE Mechanical exam graded on a curve?
- No — it's scored against a fixed competency standard (a scaled cut score), not against the other test-takers. Everyone who meets the bar passes.
- What score do I need to pass?
- There's no published percentage; NCEES reports pass/fail against the scaled cut score. Aim for mastery of the tested areas, not a number.
Put it into practice.
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