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Fish Mercury Exposure Screening Calculator — result sheet
Estimate average methylmercury dose from fish concentration, portion size, and weekly frequency, then compare the arithmetic with an entered screening reference dose.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Weekly mercury intake = concentration × portion × servings; average daily dose = weekly intake ÷ 7 ÷ body weight; dose ratio = average daily dose ÷ reference dose; theoretical maximum servings = reference dose × body weight × 7 ÷ (concentration × portion).
This transparent worksheet turns a fish concentration and eating pattern into an average daily methylmercury dose. It shows the weekly intake, body-weight-normalized dose, ratio to the entered reference dose, and a theoretical maximum frequency so visitors can inspect the arithmetic instead of receiving an unexplained yes-or-no answer.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Body weight — kg; minimum 0.1; maximum 500
- Fish mercury concentration — µg/g; minimum 0; maximum 100
- Fish portion — g; minimum 0.1; maximum 5000
- Servings per week — servings; minimum 0; maximum 1000
- Screening reference dose — µg/kg-day; minimum 1.0E-6; maximum 100
Worked example
| Input | Value |
|---|---|
| Body weight | 70 |
| Fish mercury concentration | 0.2 |
| Fish portion | 150 |
| Servings per week | 2 |
| Screening reference dose | 0.1 |
The worksheet gives 0.12245 µg/kg-day, a dose ratio of 1.22449, and a theoretical maximum of about 1.633 servings per week for these assumptions.
Assumptions and limits
- Mercury concentration and portion mass are entered in µg/g and grams, so the product gives micrograms per serving.
- Weekly intake is averaged over seven days; an occasional meal and a regular weekly pattern are not interchangeable in real advice.
- The reference dose is an entered screening value and defaults to the EPA methylmercury value shown in the cited technical material.
- The fish concentration is treated as representative of every entered serving and no cooking, species, location, or sample uncertainty is inferred.
- The theoretical maximum frequency is arithmetic, not a recommendation and not a replacement for a local fish-consumption advisory.
- This page does not diagnose exposure, determine safety for pregnancy or children, or account for other mercury sources.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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