- ACU-I is a Certiport (Pearson VUE) exam built on Autodesk Inventor, delivered live-in-application via Compass.
- Five domains are tested: Workspace and Navigation, Sketch, Model, Assemble, and Document.
- Passing score is 700 on a 1-1000 scale; roughly 150 hours of instruction is the recommended prep baseline.
- Single voucher runs $94, with retake $113, and with retake plus CertPREP practice tests $141 (US retail, checked Sept. 12, 2026).
What Is the ACU-I Certification?
The Autodesk Certified User: Inventor (ACU-I) credential verifies that a candidate can operate Autodesk Inventor at an entry-to-intermediate skill level, covering the core workflow from sketching to documented drawings. Autodesk owns the credential; Certiport, a Pearson VUE business, administers the exam through its global network of testing centers. Because the exam is live-in-the-application, you are not answering abstract multiple-choice trivia about CAD theory - you are working directly inside Inventor to complete tasks the way you would on the job.
If you're still deciding whether this credential fits your goals, the overview at What Is ACU-I Certification? and the plain-language breakdown at ACU-I Meaning are useful starting points before you commit to a voucher purchase.
Exam Format and Delivery
ACU-I is delivered through Certiport's Compass for Windows platform, which requires a compatible installation of Autodesk Inventor on the testing machine. This matters more than most candidates expect: the exam interface and file interactions mirror the real software environment, so any mismatch between your practice setup and the booked software version can cost you time during the test.
The exam also comes in Imperial and Metric variants. Before you book a seat or buy practice materials, confirm which units variant you're scheduled for and make sure your practice files use the same measurement system - mixing them up during review wastes hours of prep.
The Five Exam Domains
ACU-I content is organized around Certiport's 2022 exam objectives, grouped into five domains. Each domain represents a cluster of real Inventor workflows rather than isolated facts, so mastery means being able to execute tasks quickly and correctly inside the application, not just recognize terminology.
Domain 1: Workspace and Navigation
Covers how candidates move around the Inventor interface, manage the ribbon and browser panes, and navigate between files and views.
- Efficient use of the browser tree and navigation tools
- Understanding project files and file management basics
Domain 2: Sketch
Focuses on 2D sketching fundamentals that underpin every solid model - geometry creation, constraints, and dimensioning.
- Applying geometric and dimensional constraints correctly
- Building sketches that are fully defined before extrusion
Domain 3: Model
Tests the ability to turn sketches into 3D features using Inventor's part-modeling tools.
- Extrude, revolve, and other core feature commands
- Editing and modifying existing features accurately
Domain 4: Assemble
Covers assembling individual parts into functioning assemblies using constraints and joints.
- Placing components and applying assembly constraints
- Understanding degrees of freedom within an assembly
Domain 5: Document
Focuses on producing drawing views and annotations that communicate design intent.
- Generating base, projected, and section views
- Adding dimensions, annotations, and title block details
For a deeper walkthrough of how these five areas interconnect and where candidates typically lose points, see the full ACU-I Exam Domains 2026: Complete Guide to All 5 Content Areas.
Registration, Vouchers, and Cost
You register for ACU-I through Certiport by purchasing a voucher, then scheduling your session at a participating test center or approved remote-proctoring option. Test centers may add their own proctoring fee on top of the voucher price, so confirm total cost with your chosen location before booking.
As of the September 12, 2026 US retail check, three voucher options are available:
| Voucher Option | Includes | Price |
|---|---|---|
| Single voucher | One exam attempt | $94 |
| Voucher with retake | Exam attempt plus one retake | $113 |
| Voucher, retake, and practice test | Exam attempt, retake, and single-title CertPREP practice tests powered by GMetrix | $141 |
The bundled CertPREP option is worth considering if you want a practice environment that mirrors the live-in-application format before committing to the real exam. For a full cost breakdown including how proctoring fees can affect your total, read ACU-I Certification Cost 2026: Complete Pricing Breakdown.
Before purchasing anything, double-check eligibility details and any prerequisites in ACU-I Requirements 2026: Eligibility, Prerequisites & How to Qualify, and review scheduling windows at ACU-I Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Passing Score and Validity
ACU-I uses a scaled scoring system from 1 to 1000, with 700 required to pass. Because the scale is not a raw percentage, a candidate's score reflects performance across all five domains rather than a simple count of correct answers. Recommended preparation is approximately 150 hours of instruction and hands-on practice - a figure that assumes real time spent working inside Inventor, not just reading about it.
Certifications earned on or after June 18, 2025 remain valid for five years. Renewal requires purchasing a new voucher and passing the current version of the exam again, since Certiport periodically updates objectives and interface details.
Key Takeaway
Treat the 700 passing score as a target across all five domains, not a single weak area to cram. Uneven domain performance is a common reason candidates fall just short.
For an in-depth look at how the scaled score is calculated and what it means for retake strategy, see ACU-I Passing Score 2026: Exactly What You Need to Pass. If you're weighing whether the difficulty justifies the investment, How Hard Is the ACU-I Exam? Complete Difficulty Guide 2026 covers that in detail.
Who Earns ACU-I and Why
ACU-I is most commonly pursued by students in engineering technology, drafting, manufacturing, and industrial design programs, as well as early-career professionals who need to demonstrate practical Inventor competency to employers or instructors. Because the exam is task-based rather than theory-based, it functions as a credible signal that someone can actually build parts, assemble components, and produce documentation - not just discuss CAD concepts in an interview.
Employers in manufacturing, product design, and mechanical drafting roles often value this kind of verified, hands-on skill proof when screening candidates who lack years of formal work history. If you're exploring how this credential translates into job opportunities, ACU-I Jobs covers common roles and how the certification gets used in hiring conversations.
Building a Domain-Based Prep Schedule
Rather than studying generically, build your prep calendar around the five domains and their weight in a typical Inventor workflow. Sketch and Model tend to require the most hands-on repetition since later domains - Assemble and Document - depend on solid geometry and clean features already existing.
Workspace and Navigation, Sketch
- Get comfortable with the Inventor interface, panes, and file structure
- Practice fully-constrained sketches using the correct unit system for your booked exam
Model
- Build and edit parts using extrude, revolve, and feature-editing commands
- Time yourself completing modeling tasks to build exam-pace speed
Assemble
- Practice placing components and applying assembly constraints
- Review degrees of freedom until under-constrained assemblies are easy to spot
Document and Full Review
- Generate drawing views, annotations, and title block entries
- Take a full CertPREP-style practice run to simulate live-in-application pacing
This sequencing works because each domain builds on the last: weak sketching habits compound into modeling errors, and modeling errors compound into assembly and documentation problems. For a more detailed week-by-week plan with checkpoints, see the ACU-I Study Guide 2026: How to Pass on Your First Attempt.
Once you feel ready, running full-length timed simulations on our practice test platform is one of the best ways to confirm you can complete all five domains within the live-in-application time constraints before you spend money on the real voucher.
Frequently Asked Questions
The exam is delivered through Certiport's Compass for Windows platform, which requires a compatible installation of Autodesk Inventor on the testing machine. Confirm the required version with your test center before exam day.
Based on US retail pricing checked September 12, 2026, a single voucher is $94, a voucher with retake is $113, and a bundle with retake plus CertPREP practice tests is $141. Test centers may add their own proctoring fee.
You need a scaled score of 700 on a 1-1000 scale. The score reflects combined performance across all five domains rather than a simple percentage of questions answered correctly.
Certifications earned on or after June 18, 2025 are valid for five years. Renewing requires purchasing a new voucher and passing the current version of the exam.
Both variants exist. You must confirm which unit system your scheduled exam uses and align your practice files accordingly, since mismatched units can cause confusion during timed tasks.
If you want a condensed, single-page reference covering domains, pricing, and scoring before exam day, bookmark the ACU-I Cheat Sheet 2026: One-Page Review of Must-Know Facts, and browse more practice resources on the main site as you finalize your prep.