The following are the published equations used for the complete calculation cycle for McArthur Mk 5 Forest Fire Danger Index. All equations are sourced to original references.
All inputs are metric.
All references to the functions Log and Exp are in base e . All inputs are real numbers. Do not round off to integers, except for display purposes. 4 DSLR Days since last rain. Note also DSLR may be calculated off the day of heaviest rainfall, if subsequent rainy days had only light rainfall.