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PFAS Exposure

Calculate PFAS Exposure instantly with the exact formula and a worked example.

PFAS Exposure

PFOA in water (lab test)ng/L
PFOS in water (lab test)ng/L
Sum of the 20 PFAS in the EU Directiveng/L
Sum of 20 PFAS relative to the EU limit (100 ng/L)
45%
EU Directive 2020/2184: "Sum of PFAS" (20 substances) 0.10 µg/L = 100 ng/L, "PFAS Total" 0.50 µg/L; applies from 12 January 2026US EPA (rule of 10 April 2024): PFOA and PFOS 4.0 ng/L each; in May 2026 the EPA proposed keeping these limits and rescinding the standards for PFHxS, PFNA, HFPO-DA and the mixture hazard indexThe comparison only makes sense with a laboratory water test; 1 ng/L = 1 pptCalculate PFAS Exposure instantly with the exact formula and a worked example.
Sum of 20 PFAS, EU limit
At or below the EU limit
PFOA vs the EPA limit of 4.0 ng/L
75%
PFOS vs the EPA limit of 4.0 ng/L
150%

More about: PFAS Exposure

What it calculates

The “PFAS Exposure” calculator computes Sum of 20 PFAS relative to the EU limit (100 ng/L) in % from 3 parameters: pfoa in water (lab test) (ng/L), pfos in water (lab test) (ng/L), sum of the 20 pfas in the eu directive (ng/L).

A handy everyday calculator for daily tasks.

Example calculation

With parameters PFOA in water (lab test) = 3 ng/L, PFOS in water (lab test) = 6 ng/L, Sum of the 20 PFAS in the EU Directive = 45 ng/L the result is 45 % (EU Directive 2020/2184: "Sum of PFAS" (20 substances) 0.10 µg/L = 100 ng/L, "PFAS Total" 0.50 µg/L; applies from 12 January 2026).

How to use

  1. Enter pfoa in water (lab test), pfos in water (lab test) and sum of the 20 pfas in the eu directive — each field above is adjustable with a slider.
  2. Sum of 20 PFAS relative to the EU limit (100 ng/L) (%) is calculated automatically as you type.
  3. Check the worked example below to see the formula applied to real numbers.
  4. Copy the result or bookmark this calculator.

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FAQ

How is PFAS Exposure calculated?
The PFAS Exposure calculator computes Sum of 20 PFAS relative to the EU limit (100 ng/L) (in %) from pfoa in water (lab test), pfos in water (lab test), sum of the 20 pfas in the eu directive. Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the PFAS Exposure calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.

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