Costs & Renewal
Certification Exam Costs Explained
·13 min read
What certification exams actually cost across CompTIA, AWS, Cisco, Microsoft, ISC2 and PMI, why prices differ so much, and how pricing tiers work.
Continue readingCEUs vs PDUs vs CPEs: What Is the Difference?
CEUs, PDUs and CPEs are all continuing-education credits with different names. See which bodies use which unit, how they compare and whether they convert.
Aisha Rahman · 7 min read
A security engineer holding a CompTIA certification, a CISSP and a PMP is being asked to earn three differently named credits — CEUs, CPEs and PDUs — that all describe essentially the same thing: documented hours of professional learning. The names are not three different systems of measurement so much as three different brands for one idea.
Short answer: a CEU (Continuing Education Unit), a PDU (Professional Development Unit) and a CPE (Continuing Professional Education credit) are all continuing-education credits. Which one you earn depends on who issued your certification: CompTIA counts CEUs, PMI counts PDUs, and ISC2 and ISACA count CPEs. They are broadly comparable — most are hour-based — but they are not formally interchangeable, and each body only accepts credits logged in its own system under its own rules.
This article deals purely with the terminology and how the units line up against each other. If you want the underlying mechanics — how credits are measured, categorised and capped within a cycle — that is covered in how continuing education credits work, and the menu of qualifying activities lives in how to earn continuing education units.
Why do three names exist for the same idea?
Each certification body built its renewal programme independently and named its unit accordingly. There was never a shared standard to inherit, so the vocabulary fragmented: PMI branded its unit the PDU when it built the Continuing Certification Requirements (CCR) programme; ISC2 and ISACA both adopted the accounting-world term CPE; CompTIA and Cisco went with CEU and "CE credit" respectively.
The generic term CEU also has a life outside certification renewal. IACET (the International Association for Continuing Education and Training) is associated with a standardised Continuing Education Unit used across training and education generally. In the certification-renewal context, though, "CEU" usually means CompTIA's unit specifically — worth keeping in mind when a training provider advertises "CEUs" without saying whose.
Which certification bodies use which unit?
The mapping is one-to-one: your credential's issuer determines your unit. As of 2026, the major bodies line up like this (cycle lengths and totals per the providers' published maintenance pages — always confirm your own requirement on your issuer's site):
| Unit | Who uses it | Example requirement | Cycle | Maintenance fee model |
|---|---|---|---|---|
| CEU (Continuing Education Unit) | CompTIA | 20 CEUs for A+, 50 for Security+ | 3 years | Annual CE fees (e.g. $25/yr for A+, $50/yr for most other CompTIA certs) |
| PDU (Professional Development Unit) | PMI | 60 PDUs for PMP; 15 for CAPM | 3 years | Renewal fee ~$60 member / $150 non-member per cycle |
| CPE (Continuing Professional Education) | ISC2 | 120 CPEs for CISSP; 90 for CCSP; 45 for CC | 3 years | Annual maintenance fee $135 ($50 for CC-only) |
| CPE (Continuing Professional Education) | ISACA | 120 CPEs per cycle, minimum 20 per year | 3 years | Annual maintenance fee, reported as $45 member / $85 non-member — confirm at isaca.org |
| CE credit | Cisco | 30 for CCNA-level, 80 for CCNP-level (or renew by exam) | 3 years | — |
| None (exam-based) | AWS | Recertify by exam only; no credit system | 3 years | — |
| None (assessment-based) | Microsoft role-based | Free annual online renewal assessment; no credits, no fee | 1 year | — |
Two entries in that table matter as much as the credit names. AWS runs no continuing-education programme at all — you renew by passing an exam again — and Microsoft's role-based certifications renew through a free, open-book online assessment rather than accumulated credits. So "which credits does my certification use?" sometimes has the answer "none". The distinction between credit-based maintenance and exam-based maintenance is its own topic, unpacked in renewal vs recertification.
Are CEUs, PDUs and CPEs measured the same way?
Mostly, yes: one unit generally corresponds to one hour of qualifying learning activity, which is why the three feel interchangeable in conversation. A one-hour webinar is typically one PDU at PMI, one CPE at ISC2 or ISACA, and one CEU at CompTIA — assuming the activity qualifies under each body's rules.
The differences show up at the edges rather than in the base measurement:
- What counts. Each body publishes its own list of qualifying activities and its own caps on categories such as self-study, teaching, publishing or volunteering. An activity that earns full credit with one body may be capped or excluded by another.
- Sub-structures. ISC2 splits CPEs into Group A (domain-related) and Group B credits, with minimum Group A totals per cycle — 90 of the CISSP's 120, for instance. PMI structures PDUs around its Talent Triangle with a minimum for Education PDUs and caps on "Giving Back" PDUs. CompTIA weights CEU values by certification level.
- Annual minimums. ISACA requires at least 20 CPE hours every single year within its 3-year, 120-hour cycle, reported annually. Most other bodies let you distribute credits across the cycle as you wish.
- The IACET CEU. The standardised IACET-style CEU used in general continuing education is defined differently from a one-hour unit, so never assume "10 CEUs" from a training academy equals 10 certification-renewal credits. Check the issuing body's definition.
Because those edge rules diverge, the honest comparison is: same currency concept, different central banks.
Can you convert one credit type into another?
There is no official conversion or transfer mechanism between CEUs, PDUs and CPEs. You cannot deposit PDUs into your ISC2 account or hand ISACA a CompTIA CEU statement. Each body recognises only activities reported into its own portal under its own programme rules.
What you can often do is claim the same underlying activity with multiple bodies. Because most units are hour-based, a single qualifying activity — say, a three-hour security conference session — may legitimately be worth 3 CPEs to ISC2, 3 CPEs to ISACA and 3 PDUs to PMI, provided the activity meets each body's relevance and category rules and you report it separately to each. That is not conversion; it is parallel claiming of one learning experience. Three practical rules keep it clean:
- Check relevance per body. A project-leadership seminar might earn PDUs but fail ISC2's domain-relevance test; a cryptography deep-dive is the mirror image.
- Report to each portal separately, in each body's own unit and category, with the same evidence attached.
- Keep one set of records that satisfies the strictest auditor. Certificates of attendance, dates, durations and descriptions cover you everywhere — a system for this is laid out in how to track professional development credits.
A quick decision guide for multi-certification holders
If you hold credentials from several bodies, the terminology question collapses into three practical checks per credential:
- Which unit and how many? Read it off your issuer's maintenance page (the table above gives the 2026 headline figures for the major bodies).
- Is there an annual minimum or category floor? ISACA's 20-hours-per-year rule and ISC2's Group A minimums are the classic traps for people who plan to cram credits into year three.
- What fee rides alongside the credits? Credits alone rarely renew anything — CompTIA bills annual CE fees, ISC2 and ISACA charge annual maintenance fees, and PMI charges a per-cycle renewal fee. Fee amounts change, so confirm current figures on the provider's site before budgeting.
A worked example: an IT auditor holding CISA, Security+ and PMP is running three parallel 3-year cycles — 120 ISACA CPEs (20 minimum per year), 50 CompTIA CEUs and 60 PMI PDUs. A well-chosen 40 hours of learning a year, claimed with all three bodies where the relevance rules allow, comfortably covers all of it. Poorly chosen hours claimed with only one body triple the workload.
One adjacent point, since multi-cert holders often ask: how long each certification remains valid before these credits fall due is tabulated separately in how long certifications stay valid.
Frequently asked questions
Is a PDU harder to earn than a CPE?
No. Both typically map to an hour of qualifying activity; difficulty differences come from each body's totals and category rules, not the unit itself. The PMP's 60 PDUs over three years is a lighter load than the CISSP's 120 CPEs over the same period.
Do unused credits carry over to the next cycle?
That depends on the body's carry-over policy, not on the credit type — check your issuer's maintenance rules rather than assuming either way.
If my training certificate says "CEUs", can I claim them as CPEs?
Possibly — but on the activity's merits, not the label. If the training meets ISC2's or ISACA's qualifying-activity and relevance rules, you claim the hours as CPEs in their portal with your evidence attached. The word on the certificate neither qualifies nor disqualifies it.
Which bodies have no credit system at all?
AWS (renewal is by exam only) and Microsoft's role-based certifications (a free annual online assessment) are the notable ones among major IT providers as of 2026.
The one-sentence version to remember
CEU, PDU and CPE are dialects, not languages: CompTIA says CEU, PMI says PDU, ISC2 and ISACA say CPE, and all of them mean roughly "one hour of approved professional learning, logged in our system, under our rules". Know your issuer, know your total, know your cycle's floors and fees — and if you are still building towards a certification rather than maintaining one, you can browse requirements by provider in the certification exams directory and check your readiness with a timed practice-test simulation before booking.
Exam facts in this guide were checked against official certification-provider pages on . Fees, exam codes and policies change — confirm on the provider’s own site before you book.
Put it into practice
Test what you have just read
Reading about an exam only takes you so far. Work through practice questions for your certification and find the gaps before exam day does.
You may also like
Costs & Renewal
How Much Does a Professional Certification Cost?
·7 min read
The real end-to-end cost of earning a professional certification — exam fees, training, materials and the extras most first-time candidates forget.
Continue reading
Costs & Renewal
Are Certification Courses Worth the Cost?
·5 min read
When paid certification training earns its price and when self-study wins — a decision framework comparing courses, bootcamps and self-study by candidate situation.
Continue reading