Radiant Heat Transfer
View Factor Calculator
Compute configuration factors between fire source emitters and target surfaces. Used for AS 1530.4 separation distance and external fire spread assessments.
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Fire Engineering Calculators for Building Professionals
Validated, free online tools for performance-based fire safety engineering — aligned to NCC 2022, AS 1530.4, and SFPE methodology.
5
Professional Calculators
Free
For Registered Engineers
NCC 2022
Compliance
AU
Local Standards
Engineering Tools
Each calculator is built on established fire engineering methodology and validated against recognised references. Click any tool to read the full methodology and launch the interactive calculator.
Radiant Heat Flux
Rad Calc
Assess peak local incident radiant heat flux using reusable view factors, explicit source assumptions, multiple surfaces, and report-ready outputs.
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Egress Engineering
RSET Calculator
Calculate all components of Required Safe Egress Time — detection, alarm, pre-evacuation, and travel — for performance-based BCA assessments under AS/NZS 3745.
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Structural Fire Design
Fire Severity Calculator
Convert real compartment fire severity into an equivalent standard fire duration (EN 1991-1-2 Annex E method) for FRL assessment and Performance Solutions.
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Design Fire
HRR Plotter
Build and visualise t-squared fire growth curves for any design fire scenario. Export growth rate tables for smoke and thermal engineering calculations.
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Smoke Management
Smoke Filling Calculator
Compute smoke layer descent in atriums, malls, warehouses, and car parks using Thomas MQH plume correlations per NFPA 92 and AS 1668.1.
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Professional Use: All FISHTANK calculators are designed for use by qualified fire safety engineers and related building practitioners. Results must be verified by a competent person before being applied in fire engineering reports, building designs, or regulatory submissions.
Built for Engineering Professionals
Standards Compliance
Aligned to NCC 2022, AS 1530.4, AS/NZS 3745, and the ABCB performance-based assessment pathway. Terminology and standards references follow established industry practice.
Validated methods
Calculations are based on SFPE Handbook correlations, peer-reviewed methods, and internationally recognised standards including EN 1991-1-2, NFPA 92, and ISO 13943.
Free for engineers
Individual registered practitioners access the full calculator suite at no cost. No per-calculation fees, no licence key. Register in under a minute.
Report-ready output
Every calculation generates a step-by-step log with inputs, intermediate values, and results — formatted for direct inclusion as an annexure in fire engineering reports.
Standards & References
FISHTANK calculators are developed and validated against the following standards and reference documents applicable to fire safety engineering practice.
NCC 2022AS 1530.4AS/NZS 3745AS 1668.1EN 1991-1-2NFPA 92NFPA 80AISO 13943SFPE HandbookBS 7974ISO 9705
Start Calculating — It's Free
Register as an individual practitioner in under a minute. No licence fee, no credit card required.