Work out first aider requirement instantly with clear inputs, formula shown and shareable results.
First aid provision is set by a ratio that tightens with workplace hazard: roughly one first aider per hundred workers in a low hazard office, one per twenty-five in high hazard work. Cover must exist on every shift, and an allowance for annual leave, training and sickness is needed so the ratio holds in practice rather than only on paper.
First aider count
Per shift = ceil(workers per shift / ratio); total = per shift x shifts x (1 + absence allowance)
Preliminary estimate only. First aid provision must be determined by a documented needs assessment under the applicable first aid regulations.
Per shift = ceil(workers per shift / ratio); total = per shift x shifts x (1 + absence allowance). First aid provision is set by a ratio that tightens with workplace hazard: roughly one first aider per hundred workers in a low hazard office, one per twenty-five in high hazard work.
Most regulators publish it as guidance rather than a fixed rule, expecting a needs assessment that also considers remoteness, shift patterns, hazard type and travel time to hospital.
This calculator takes 4 inputs: Workers on site, Workplace risk level, Shifts per day, Allowance for leave and absence. The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.