How do I calculate Performance Level (PL) Determination?

To calculate Performance Level (PL) Determination: Enter Severity of injury (S), Frequency of exposure (F), Possibility of avoidance (P). Click Calculate. INDUGRID computes the result instantly using the formula: Risk graph: S (severity) × F (frequency) × P (avoidance) → PLr. No registration required.

Is the Performance Level (PL) Determination calculator free?

Yes. The INDUGRID Performance Level (PL) Determination calculator is completely free, requires no account or login, and works on desktop and mobile browsers.

Machine Safety

Performance Level (PL) Determination

Determine the required Performance Level (PLr) for a safety function according to ISO 13849-1, based on severity, frequency and possibility of avoidance.

Units:

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💡PLr is the starting point — it tells you what your safety system must achieve. PL 'a' is the lowest (least demanding), PL 'e' is the highest. Most industrial machinery requires PLc or PLd. Always verify with a complete risk assessment per ISO 12100.

Risk graph: S (severity) × F (frequency) × P (avoidance) → PLr

Input

Severity of injury (S) iS1: Normally reversible injury (cuts, bruises, fractures that heal). S2: Irreversible injury, death, loss of limb, permanent disability.

Frequency of exposure (F) iF1: Infrequent access, short duration. F2: Frequent access required (operator setup, feeding parts, etc.).

Possibility of avoidance (P) iP1: Hazard can be noticed and avoided (slow moving, visible). P2: Hazard cannot be reliably avoided (fast, concealed, unexpected).

Result

Required Performance Level PLr —

Minimum SIL level (IEC 62061) —

Typical safety category (ISO 13849) —

Typical solution examples —