MARITIME – AFETY, URVIVAL & RECUE CALCULATOR
Emergency Rations Days
A precise tool.
What is the Emergency Rations Days & How does it work?
In maritime emergencies, the duration that a crew can survive depends on the amount of food and water available per person. Regulations typically prescribe a minimum daily ration of calories and a minimum water intake to maintain health and cognitive function. The calculation must consider both supplies, because the limiting factor—whether food or water—determines the total survivable days. By dividing the total stock by the per‑person daily allowance and the number of persons, we obtain the number of days each resource can sustain the crew. The final emergency rations duration is the lesser of the food‑limited and water‑limited days, ensuring that the crew does not run out of either essential supply.
D = minleft(frac{F}{N cdot f}, frac{W}{N cdot w}right)
F = total food weight (kg), W = total water volume (L), N = number of persons, f = daily food allowance per person (kg), w = daily water allowance per person (L), D = survivable days
Parameters
Result
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Frequently Asked Questions
How do I calculate the number of days my emergency rations will last?
Divide your total food and water supplies by the per-person daily allowance to find out how many days they will last.
What is the minimum daily ration prescribed for maritime emergencies?
Regulations typically prescribe a minimum of 2,700 calories and 3 liters of water per person per day.
How does the limiting factor affect the calculation?
The limiting factor is whichever resource—food or water—is depleted first. This determines the total number of survivable days.
Can I use this calculator for non-maritime situations?
While designed for maritime emergencies, the principles can be applied to any survival situation where food and water are limited resources.
What should I consider when planning emergency rations for my crew?
Consider factors such as the number of people, their physical activity levels, environmental conditions, and specific dietary needs.
How often should I update my emergency ration supplies?
It's recommended to review and replenish your emergency rations at least annually or whenever there are significant changes in crew size or operational requirements.
Results are for informational purposes only and do not constitute professional advice.