A Safety Professional should not only identify hazards — we should be able to measure, analyze and improve safety performance

 🦺📊 SAFETY FORMULAS & CALCULATIONS

A Safety Professional should not only identify hazards — we should be able to measure, analyze and improve safety performance.

Important formulas every HSE professional should know:

🔹 SAFETY PERFORMANCE

1️⃣ Frequency Rate (FR)

LTI × 1,000,000 ÷ Man-hours Worked

2️⃣ Severity Rate (SR)

Lost Workdays × 1,000,000 ÷ Man-hours Worked

3️⃣ LTIFR

LTIs × 1,000,000 ÷ Hours Worked

4️⃣ TRIR

Recordable Cases × 200,000 ÷ Hours Worked

5️⃣ DART Rate

DART Cases × 200,000 ÷ Hours Worked

6️⃣ Lost Workday Case Rate

LWDC × 200,000 ÷ Hours Worked

7️⃣ Incident Rate

No. of Incidents × 200,000 ÷ Hours Worked

8️⃣ Near-Miss Rate

Near Misses × 1,000,000 ÷ Man-hours Worked

🔹 MAN-HOUR & WORKFORCE CALCULATIONS

9️⃣ Man-hours Worked

Workers × Working Hours × Working Days

🔟 Average Workforce

Total Man-hours ÷ Total Working Hours

1️⃣1️⃣ Safe Man-hours %

Safe Man-hours ÷ Total Man-hours × 100

1️⃣2️⃣ Absenteeism %

Absent Man-days ÷ Available Man-days × 100

🔹 AUDIT & COMPLIANCE

1️⃣3️⃣ Audit Compliance %

Compliant Points ÷ Applicable Points × 100

1️⃣4️⃣ PPE Compliance %

Compliant Workers ÷ Workers Checked × 100

1️⃣5️⃣ PTW Compliance %

Compliant Permits ÷ Permits Audited × 100

1️⃣6️⃣ CAPA Closure %

Closed Actions ÷ Total Actions × 100

1️⃣7️⃣ Training Compliance %

Trained Employees ÷ Applicable Employees × 100

1️⃣8️⃣ Inspection Compliance %

Completed Inspections ÷ Planned Inspections × 100

🔹 RISK MANAGEMENT

1️⃣9️⃣ Risk Score

Likelihood × Severity

2️⃣0️⃣ Residual Risk

Risk remaining after implementing controls.

2️⃣1️⃣ Risk Reduction %

(Initial Risk − Residual Risk) ÷ Initial Risk × 100

🔹 EMERGENCY & FIRE SAFETY

2️⃣2️⃣ Emergency Response Time

Time of Emergency Notification → Time of Effective Response

2️⃣3️⃣ Evacuation Time

Assembly Completion Time − Alarm/Notification Time

2️⃣4️⃣ Fire Extinguisher Coverage

No. of Required Extinguishers vs. No. of Available/Compliant Extinguishers

🔹 SAFETY OBSERVATION & BEHAVIOUR

2️⃣5️⃣ Observation Closure %

Closed Observations ÷ Total Observations × 100

2️⃣6️⃣ Unsafe Act %

Unsafe Acts ÷ Total Observations × 100

2️⃣7️⃣ Unsafe Condition %

Unsafe Conditions ÷ Total Observations × 100

2️⃣8️⃣ Repeat Observation %

Repeat Observations ÷ Total Observations × 100

🔹 CONTRACTOR SAFETY

2️⃣9️⃣ Contractor Incident Rate

Contractor Recordable Cases × 200,000 ÷ Contractor Hours Worked

3️⃣0️⃣ Contractor Compliance %

Compliant Contractor Requirements ÷ Applicable Requirements × 100

3️⃣1️⃣ Induction Compliance %

Inducted Workers ÷ Total Mobilized Workers × 100

🛡️ THE HSE MINDSET

IDENTIFY → ASSESS → CONTROL → MEASURE → ANALYZE → IMPROVE