HSEQ Global Academy / Tools

HSEQ calculators

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Results support, but do not replace, a competent person's assessment.

Risk matrix

Matrix size

Likelihood ↓ · Severity →

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R = L × S

Incident rates (TRIR, LTIFR, DART, severity)

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TRIR = recordable × base / hours · LTIFR = LTI × base / hours · DART = DART × base / hours · SR = days lost × base / hours

Exposure hours

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H = employees × hours/week × weeks/year

Heat stress (WBGT)

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Indoor: WBGT = 0.7·Tnw + 0.3·Tg · Outdoor: WBGT = 0.7·Tnw + 0.2·Tg + 0.1·Tdb · reference (acclimatised, continuous work, ISO 7243 indicative): light 31 / moderate 28 / heavy 26 °C

Daily noise dose

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T(L) = 8 / 2^((L − Lc)/q) · D = 100 × Σ Ci/Ti · LEX,8h = Lc + q·log2(D/100)

Manual handling (revised NIOSH lifting equation)

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RWL = 23 × (25/H) × (1 − 0.003|V − 75|) × (0.82 + 4.5/D) × (1 − 0.0032A) × FM × CM · LI = load / RWL (FM shown for ≤1 h duration, V < 75 cm)