How Many AEDs Does Your Facility Need? A Complete Placement Guide

Knowing how many AEDs you need starts with one rule: any person on your property should be able to reach a defibrillator and return to a collapsed victim within three to five minutes. That single standard drives every decision about AED count, placement, and coverage.

Sudden cardiac arrest survival drops about 10% for every minute without defibrillation. Emergency medical services often take eight minutes or longer to arrive. That gap is why the number and location of your AEDs matters more than most facility teams realize.

This guide covers what actually determines your AED count, how to plan coverage by distance, what different facility types typically require, and how to place each unit for the fastest possible response. Enterprise and multi-site teams will find specific guidance near the end.

The 3 to 5 Minute Rule: Your Starting Point

Quick answer: Plan for a round-trip retrieval time of three to five minutes or less. That means an AED should be reachable within a 90-second to 2.5-minute walk from any point in your facility.

The math is simple. A rescuer has to notice the emergency, walk to the AED, and walk back. If the one-way trip takes more than 90 seconds, you likely need another unit.

Guidelines from the American Heart Association support this target. The goal is to deliver the first shock within three to five minutes of collapse. Everything about AED coverage planning works backward from that window.

Keep in mind that walking distance is not the same as straight-line distance. Walls, locked doors, elevators, and stairs all add time. Always measure the real path a person would travel.

How Many AEDs Do I Need? Key Factors

Facility size is only one input. Your final count depends on several factors working together.

Facility Size and Square Footage

A common planning benchmark is one AED per 20,000 to 40,000 square feet on a single floor. Open, uncomplicated layouts fall toward the higher end. Congested or divided spaces need more.

• Small office (under 20,000 sq ft, single floor): often 1 AED
• Mid-size facility (20,000 to 50,000 sq ft): 2 to 3 AEDs
• Large facility (50,000+ sq ft): calculate by travel time, not square footage alone

Number of Floors

Each floor generally needs its own AED. Waiting for an elevator or climbing stairs burns critical time. Do not assume one unit can cover multiple levels.

For multi-story buildings, place AEDs near stairwells and main elevator banks on every floor.

Building Layout

A rectangular warehouse and a maze-like hospital wing of the same size have very different needs. Complex layouts with long corridors, security doors, or separated wings require more units to hit the same response time.

Occupancy and Foot Traffic

More people means higher statistical risk and often larger spaces to cover. High-occupancy sites like arenas, malls, and manufacturing plants need denser AED coverage than a quiet office of the same footprint.

Population Risk Profile

Some environments carry elevated cardiac risk. Gyms, senior facilities, industrial sites, and public venues often warrant additional units beyond the size-based minimum.

AED Coverage Requirements by Facility Type

Workplace AED requirements vary by state, industry, and building code. Use these ranges as planning starting points, then confirm your local mandates.

Offices and Corporate Buildings

• One AED per floor as a baseline
• Additional units for floors over 20,000 sq ft
• Place near elevators, break rooms, and main entrances

Warehouses and Manufacturing

• Cover the full floor within the 3 to 5 minute rule
• Account for machinery, racking, and blocked sightlines
• Add units near loading docks and high-activity zones

Schools and Universities

• Gymnasiums and athletic facilities are high priority
• Cover cafeterias, auditoriums, and administrative areas
• Many states now mandate AEDs in schools

Retail and Shopping Centers

• Cover sales floors and back-of-house areas
• Position near customer service and main concourses
• Large malls need multiple units per level

Fitness and Recreation Centers

• High cardiac risk means denser coverage
• Place near workout floors, pools, and courts
• Response time here is especially critical

Hotels and Hospitality

• Cover lobbies, pools, fitness rooms, and event spaces
• Large properties need units across multiple wings and floors

Strategic AED Placement Rules

Buying the right number of AEDs only works if you place them well. Poor placement can waste coverage even when the count is correct.

Prioritize High-Traffic Areas

Put AEDs where people naturally gather and pass through:

• Main entrances and lobbies
• Elevator banks and stairwells
• Break rooms and cafeterias
• Reception and security desks

These spots are easy to find under stress and reduce retrieval time for the most people.

Make Units Visible and Accessible

• Mount AEDs on walls at a consistent, visible height
• Use clear signage that can be seen from a distance
• Never lock units behind badge-access doors or in offices
• Keep the path to each AED clear at all times

Cover Stairwells and Level Transitions

Stairwells slow rescuers down. Placing AEDs near stairwell entrances on each floor protects the areas hardest to reach quickly.

Address Large Open Spaces

Warehouses, factory floors, and event halls have long travel distances. Position units around the perimeter and at central points so no corner sits outside the response window.

Standardize Locations Across the Building

When AEDs live in predictable spots on every floor, staff find them faster. Consistency reduces hesitation during an emergency.

AED Location Planning: A Simple Process

Use this step-by-step method to map your needs.

1. Get a floor plan for every level of your facility.
2. Mark high-traffic and high-risk zones where a collapse is more likely or harder to reach.
3. Measure walking routes, not straight lines, from potential AED spots.
4. Test the 3 to 5 minute rule by timing a walk to and from each proposed location.
5. Identify gaps where any point exceeds a 90-second one-way trip.
6. Add units to close those gaps.
7. Confirm local requirements for your state and industry.
8. Document placements for training, compliance, and audits.

Walk the routes in person. A plan that looks fine on paper often reveals blocked paths or locked doors in the real world.

Multi-Site and Enterprise Considerations

Organizations with many locations face a different challenge. Each site needs its own coverage plan, but the program has to stay consistent and manageable across the whole portfolio.

Standardize Your Program

• Use the same AED models across sites when possible
• Apply consistent placement rules building to building
• Simplifies training, maintenance, and part replacement

Account for Site Variation

A corporate office and a distribution center have different layouts and risks. Standardize the process, not a fixed unit count. Each site still needs its own travel-time analysis.

Track Compliance Across Locations

Different states carry different AED laws. A multi-site program has to meet each jurisdiction's requirements while keeping records audit-ready.

Manage Readiness at Scale

The more AEDs you deploy, the harder manual tracking becomes. Expired pads, dead batteries, and missed inspections multiply with every site. Wireless monitoring and managed programs keep large fleets compliant without relying on manual walkthroughs at each location.

Common Placement Mistakes to Avoid

• Counting square footage while ignoring layout and travel time
• Assuming one AED can cover multiple floors
• Hiding units in offices or behind locked doors
• Skipping high-risk areas like gyms and industrial floors
• Placing units without clear, visible signage
• Forgetting to confirm state and local mandates

Key Takeaways

• Plan for a 3 to 5 minute round-trip retrieval time as your core standard.
• Base your count on layout and travel time, not square footage alone.
• Give each floor its own AED and cover stairwells and transitions.
• Prioritize high-traffic and high-risk areas with visible, accessible placement.
• For multi-site programs, standardize the process and manage readiness at scale.
• Always confirm local AED requirements for your state and industry.

Get an Expert AED Placement Assessment

Calculating coverage across one building is manageable. Doing it across an entire organization, while staying compliant and rescue-ready, is harder.

Premedics helps facilities of every size plan AED placement, meet coverage requirements, and keep every device ready when it matters. We serve businesses and organizations nationwide with turnkey, wireless, and fully managed AED programs.

Ready to map your facility's coverage? Visit premedics.com to schedule a consultation and get a complete placement and compliance evaluation.