CPR and AED certification is a credential you earn after completing a training course that teaches you how to perform chest compressions and use a portable defibrillator on someone in cardiac arrest. Most courses take between 3 and 5 hours, the certification lasts two years, and it’s required for a wide range of jobs from healthcare to childcare to logging.
What CPR and AED Actually Do
Cardiac arrest is an electrical malfunction in the heart. The heart stops pumping blood, and the brain starts running out of oxygen within minutes. CPR (cardiopulmonary resuscitation) keeps blood circulating, even partially, until paramedics arrive with advanced equipment. An AED (automated external defibrillator) delivers an electric shock to reset the heart’s rhythm. Together, they form the two most critical links in what the American Heart Association calls the “Chain of Survival” for out-of-hospital cardiac arrest.
CPR on its own doesn’t typically restart a stopped heart. What it does is buy time. Chest compressions push oxygenated blood to the brain and vital organs, extending the window for a successful resuscitation from minutes to potentially much longer. The AED is what actually addresses the underlying electrical problem, and the machines are designed so that untrained bystanders can use them: they give voice prompts and will only deliver a shock if the heart rhythm requires one.
What You Learn in the Course
A standard CPR and AED certification course covers a specific set of hands-on skills that you’ll be tested on before receiving your card. The core of the training is high-quality chest compressions: pushing hard and fast in the center of the chest at a rate of 100 to 120 compressions per minute, to a depth of at least 2 inches but no more than 2.4 inches for an adult. You’ll practice maintaining proper hand placement, avoiding leaning on the victim between compressions, and minimizing any interruptions.
For trained rescuers, the course also covers conventional CPR with rescue breaths at a ratio of 30 compressions to 2 breaths. You’ll learn to recognize cardiac arrest, call 911, and begin compressions immediately. The AED portion teaches you how to power on the device, place the adhesive pads on the victim’s bare chest (adult pads for anyone 8 or older, pediatric pads for younger children if available), and follow the machine’s prompts to deliver a shock. Most courses also cover choking relief and may touch on infant and child CPR, where compression depth is shallower: about 1.5 inches for infants and 2 inches for children.
Course Levels and Who Needs What
Not all CPR certifications are the same. There are distinct course levels aimed at different audiences, and picking the right one matters because employers often require a specific credential.
- Heartsaver CPR AED: Designed for people with little or no medical training. This is the standard course for office workers, teachers, personal trainers, lifeguards, and anyone who needs a completion card for a job or simply wants to be prepared. If you’re not a healthcare professional, this is almost certainly the one you need.
- Basic Life Support (BLS): Aimed at first responders and professional rescuers, including firefighters, police, EMTs, nurses, and other healthcare providers. It goes deeper into team-based resuscitation, ventilation techniques, and multi-rescuer scenarios.
- Advanced Cardiovascular Life Support (ACLS): A higher-level course for healthcare providers that builds on BLS skills. Students are expected to already be proficient in BLS before enrolling.
How Long It Takes and What It Costs
The time commitment depends on the format you choose. A fully in-person, instructor-led Heartsaver course runs about 3.5 hours. The blended learning option, which pairs a self-paced online module with an in-person skills session, takes roughly 3 hours online plus 2 hours in person. A newer self-guided option combines about 2 hours of online learning with a 1-hour hands-on practice and skills test. Actual times vary with class size and discussion.
Pricing is relatively affordable. The AHA’s Heartsaver CPR AED online-only portion costs $18.50, while a blended learning bundle that includes the online course, digital textbook, and electronic certification card runs about $33.50. The in-person skills session is usually arranged through a local training center and may carry an additional fee. BLS and ACLS courses for healthcare professionals tend to cost more, typically ranging from $50 to $200 depending on the provider and format.
In-Person Skills Testing Is Required
This is a point that trips people up: you cannot earn a legitimate, employer-accepted CPR and AED certification entirely online. Every AHA course path, whether classroom, blended, or self-guided, requires a hands-on skills session where you demonstrate compressions on a manikin and operate an AED trainer. The online portion covers the knowledge component, but you must complete a verified in-person skills check to receive your course completion card. Before enrolling, check with your employer to confirm which format and course level they accept.
AHA vs. Red Cross Certification
The two biggest names in CPR training are the American Heart Association and the American Red Cross, and while both produce competent rescuers, there are practical differences worth knowing. The AHA sets the science-based guidelines that other organizations, including the Red Cross, use as their foundation. You’ll often see Red Cross materials referencing training “consistent with AHA Guidelines.” Because of this role, AHA courses tend to go more in depth, and AHA certification is more commonly required by healthcare employers.
The pass threshold is slightly different: the Red Cross requires 80% on the final exam, while the AHA requires 84%. Red Cross certifications for most courses are valid for one year (except their healthcare provider course), while AHA certifications are valid for two years. Both organizations offer renewal courses that are shorter than the initial certification, letting you update your skills and extend your credential without starting from scratch.
How Long Certification Lasts
Both AHA and Red Cross CPR certifications last two years for their core courses. After that, you’ll need to take a renewal or recertification course to stay current. Renewal courses are abbreviated, running shorter than the original training, and they cover updated techniques or guideline changes that may have occurred since your last certification. Letting your certification lapse doesn’t prevent you from renewing, but some employers require uninterrupted credentialing, so it’s worth tracking your expiration date.
Who Is Required to Be Certified
Many industries require at least some employees to hold current CPR and AED certification. OSHA mandates first-aid and CPR training for employees in logging, and similar requirements exist across construction, electrical work, and other high-hazard industries where emergency medical services may not be quickly accessible. Beyond OSHA, state licensing boards commonly require CPR certification for nurses, dental hygienists, physical therapists, childcare workers, teachers, coaches, fitness professionals, and flight attendants. Even when not legally required, many employers in office settings and the service industry make it a condition of employment.
Legal Protection When You Respond
Every U.S. state has some form of Good Samaritan law that provides legal protection to people who give emergency aid in good faith. California’s statute is representative: a person who voluntarily and without compensation renders emergency care at the scene of an emergency is generally not liable for civil damages, provided they don’t act with gross negligence or willful misconduct. These protections apply at the scene of an emergency, not in hospitals or clinics where medical care is routinely provided. The laws are specifically designed to encourage bystanders to act without fear of a lawsuit, and having CPR certification strengthens your position by demonstrating that you acted within the scope of your training.