How do I determine the correct number of trained first aid officers for my workplace?
Short Answer: The right number of first aid officers depends on two things: how many people are typically on site and how risky the work is. Safe Work Australia's guidance points to one trained officer for every 50 workers in low risk workplaces such as offices and shops, tightening to one for every 25 workers where the work carries a higher chance of injury, such as construction or manufacturing. An office running 60 staff would sit at two trained officers under that ratio, while a 75-person factory floor classed as high risk would need three. Getting that ratio right only helps if it is backed by properly stocked first aid kits, since a trained officer without the right supplies on hand can only do so much.
Working out the exact headcount for your site takes more than a quick ratio calculation, though. Before you land on a final number, you also need to consider the following:
• Does staff size directly influence officer numbers?
• Are officers required on every shift?
• What training certifications are necessary?
• How can businesses maintain ongoing certification compliance?
Does staff size directly influence officer numbers?
Yes, and it is the starting point for any calculation. Safe Work Australia's model Code of Practice ties the number of first aid officers directly to headcount and risk category, and the risk category itself comes from a straightforward risk assessment of the hazards present rather than a guess. Manual handling, machinery, chemicals and vehicle movement all push a workplace toward the higher-risk ratio, while a typical office or retail floor sits at the lower end.
The figure that matters is the maximum number of people on site at any one time, not the number on payroll. That includes casual staff, contractors and regular visitors who could be affected by an incident, not just permanent employees clocking in each morning. A business with 200 staff spread across two alternating shifts of 100 should be calculating officer numbers against the 100 who are actually present at any given time, then repeating the same calculation for the second shift.
When the numbers fall between ratio thresholds, round up rather than down. A retail store with 45 staff sits just under the 50-worker mark, but most businesses still appoint at least one trained officer, since waiting for headcount to tip over a line before acting on safety rarely holds up well after an incident.
Are officers required on every shift?
Coverage needs to follow the roster, not just the org chart. A single trained officer working nine-to-five does not help a night shift crew or a weekend skeleton staff if something goes wrong outside those hours. Each shift needs its own coverage, calculated against the same staff-size and risk ratios used for the main workforce, rather than assuming the daytime figure carries the whole roster.
This gets more complicated across multi-storey buildings or spread-out worksites, where response time matters as much as raw numbers. A single officer stationed on the ground floor of a six-storey office is not much use to someone injured on level five, so larger or vertically spread workplaces often need officers distributed by floor or zone rather than concentrated in one spot. Labour hire staff and contractors moving through the site should also know who to call, since a well-covered roster still fails if nobody on the floor knows who the trained officer is.
Remote or isolated sites carry their own pressure. Where paramedics or hospitals are hours away rather than minutes, workplaces are expected to build in extra self-reliance, whether through additional trained officers, higher-level certifications, or better-equipped kits. Businesses running on a single qualified officer should also plan for that person's annual leave, sick days and shift swaps, because a roster gap is still a gap even when it was not intentional.
What training certifications are necessary?
The baseline qualification is HLTAID011 Provide First Aid, a nationally recognised unit delivered by Registered Training Organisations. It covers CPR, wound management, burns and how to respond to common workplace injuries and medical events, and it typically takes a single day to complete in person.
The certificate itself is valid for three years, but the CPR component sits on a shorter clock. HLTAID009 Provide Cardiopulmonary Resuscitation needs refreshing every twelve months, since resuscitation skills fade faster than general first aid knowledge without regular practice.
Higher risk industries often layer on additional units. Remote or isolated work environments may call for remote area first aid training, while sites with electrical hazards sometimes require low voltage rescue certification alongside the standard course. Larger workplaces sometimes appoint a senior first aid officer to coordinate the wider team, keep the register current and act as the point of contact during an incident. Whatever combination applies, certificates need to come from a Registered Training Organisation to count toward workplace compliance, and an expired certificate will not satisfy a WHS audit.
How can businesses maintain ongoing certification compliance?
Certification compliance tends to slip through the cracks not because businesses do not care, but because expiry dates are easy to lose track of across a workforce. A simple register listing each officer's name, qualification and expiry date, checked quarterly, catches lapses before they become a live compliance gap.
Calendar reminders set three months ahead of each CPR renewal and each full HLTAID011 expiry give enough lead time to book a course without scrambling. It is worth reviewing officer numbers whenever staff levels shift meaningfully, whether through hiring, a new shift pattern or a site expansion, since the ratio that worked at 40 staff will not necessarily hold at 70. A near miss or an actual incident is also a natural trigger to revisit whether current officer numbers and training levels are still enough.
Furthermore, a special duty is placed on the PCBU to ensure that all first aid kits are routinely inspected and maintained. Many businesses find it easier to hand that ongoing task to SURVIVALSWAP, a managed restocking service that keeps kits compliant and properly supplied without relying on someone remembering to check expiry dates between busy periods.
Related Question
What happens if a workplace does not have enough first aid officers?
Falling short of the recommended ratio puts a business at odds with its WHS duties and leaves genuine incidents without a fast, trained response on hand. Beyond the immediate safety risk, this gap tends to surface at the worst possible time, during a workers compensation claim or a regulator's site visit following an injury, when the difference between required and actual officer numbers becomes very hard to explain away. Treating officer numbers as a figure that moves with the business, rather than a box ticked once and forgotten, keeps that exposure closed.
Conclusion
Working out the right number of first aid officers is not a one-off calculation. It is a figure that should move with your headcount, your shift patterns and the risk profile of the work being done, checked against Safe Work Australia's ratios rather than a gut estimate. Pairing the right number of trained officers with properly stocked kits from SURVIVAL and browsing the accessories range for site-specific supplies rounds out a first aid setup that holds up to scrutiny rather than just looking compliant on paper.
For help matching officer numbers, kit selection or SURVIVALSWAP restocking to your specific workplace, contact the SURVIVAL team on 0414 816 496 or sales@survival.net.au.