Fire Time-Equivalent Calculator
Heat-equivalent exposure against independently matched constant standard-fire flux approximation, not temperature-time area or structural fire-resistance rating. Caller independently establishes units, regime, calibration and applicability; this does not establish design-code compliance, authenticity, operational safety, treatment efficacy or a validated forecast.
Description
A constant-flux equivalent fire time compares heat exposure with a declared reference heat flux.
A constant-flux equivalent fire time compares heat exposure with a declared reference heat flux.1
It is distinct from determining a component's fire-resistance rating. Use this tool to calculate fire Time-Equivalent from the supplied measurements and assumptions.
When to use Fire Time-Equivalent Calculator
Use this tool to calculate fire Time-Equivalent from the supplied measurements and assumptions. Establish the SI units or caller unit basis, load signs, measurement interval, model conditions and independently chosen coefficients or references.
How to use Fire Time-Equivalent Calculator and understand its results
- Establish the SI units or caller unit basis, load signs, measurement interval, model conditions and independently chosen coefficients or references.
- Enter observedMatchedHeatExposureJm2, callerVerifiedStandardFireHeatFluxWm2, using the field meanings and rules below, then run the tool.
- Read constantReferenceFireEquivalentSeconds. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedMatchedHeatExposureJm2 | Observed matched heat exposure jm2 | number | Required |
| callerVerifiedStandardFireHeatFluxWm2 | Caller verified standard fire heat flux wm2; caller assertion or measurement requiring independent evidence | number | Required |
Enter nonnegative matched heat exposure in J/m² and positive independently established constant reference heat flux in W/m². Divide exposure by flux to return equivalent seconds. No time-varying standard-fire integration or material resistance is modeled.
equivalentSeconds=heatExposureJ/m²/referenceFluxW/m² Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| constantReferenceFireEquivalentSeconds | Constant Reference Fire Equivalent Seconds; follow the units, sign, ordering and evidence convention stated above | number |
{
"input": {
"observedMatchedHeatExposureJm2": 100,
"callerVerifiedStandardFireHeatFluxWm2": 2
},
"output": {
"constantReferenceFireEquivalentSeconds": 50
}
}Limitations and assumptions
It is distinct from determining a component's fire-resistance rating. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use Fire Time-Temperature Severity Calculator for this related task: A temperature-time integral summarizes gas-temperature exposure relative to a chosen datum.
Use Plate Navier Bending Calculator when its separate inputs and assumptions fit the question: Navier plate bending represents a simply supported rectangular plate with a modal series.
References
-
Fire Time-Equivalent Calculator — tool.io
Similar or alternative tools
- Fire Time-Temperature Severity Calculator
A temperature-time integral summarizes gas-temperature exposure relative to a chosen datum.
- Plate Navier Bending Calculator
Navier plate bending represents a simply supported rectangular plate with a modal series.