Toxicity Units Calculator
Actual single-substance toxic units normalized by independently applicable matching route/species/duration endpoint, not a universal toxic dose or harm probability. Actual independently matched quantities/units required; not infer causal effect, clinical guidance or safe design.
Description
A toxic unit normalizes a measured concentration by a matched endpoint concentration.
A toxic unit normalizes a measured concentration by a matched endpoint concentration.1
The endpoint's organism, route and duration remain necessary for interpretation.
When to use Toxicity Units Calculator
Use this tool to calculate or review the supplied observations under the stated rules. Establish the chemical, exposure route, endpoint, measurement basis and independently applicable assay or assessment reference.
How to use Toxicity Units Calculator and understand its results
- Establish the chemical, exposure route, endpoint, measurement basis and independently applicable assay or assessment reference.
- Enter actualMeasuredConcentration, callerIndependentlyApplicableEndpointConcentration, using the field meanings and rules below, then run the tool.
- Read result.observedRatio. Use the units and subtraction order below to interpret each value; retain negative differences where returned.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualMeasuredConcentration | Actual measured concentration | number | Required |
| callerIndependentlyApplicableEndpointConcentration | Caller independently applicable endpoint concentration | number | Required |
Require a finite nonnegative numerator and strictly positive denominator. Divide the supplied measurements without converting their units or clamping the result. The implementation does not enforce numerator≤denominator, so a ratio above one can be returned. Use independently compatible definitions and units.
observedRatio=numerator/denominator Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Qualified observed calculation or explicit reference | object |
| result.observedRatio | Declared numerator divided by matched denominator on the stated compatible basis; no upper-one clamp. | number |
{
"input": {
"actualMeasuredConcentration": 2,
"callerIndependentlyApplicableEndpointConcentration": 4
},
"output": {
"result": {
"observedRatio": 0.5
}
}
}Limitations and assumptions
Chemical identity, route, assay, exposure basis and reference applicability are caller-established. The output supplies no causal conclusion, universal toxicity threshold or authoritative regulatory determination.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Extremely large composite outputs are rejected.
Alternative or Complementary methods
For a related step, use Toxic Units Mixture Calculator: Mixture toxic units can be summed under a declared concentration-addition model with compatible endpoints. For a complementary comparison, use Relative Potency Factor Calculator: Relative potency can vary across matched effect levels when response relationships are not parallel.
References
-
Toxicity Units Calculator — tool.io
Similar or alternative tools
- Toxic Units Mixture Calculator
Mixture toxic units can be summed under a declared concentration-addition model with compatible endpoints.
- Relative Potency Factor Calculator
Relative potency can vary across matched effect levels when response relationships are not parallel.