Rations Calculator
Field rations by type, personnel, and days of supply.
About this calculator
This calculator sizes field ration requirements -- individual meals, weight, storage cases, and preparation water -- from personnel count, days of supply, meals per day, and ration type. Total meals multiplies personnel count, meals per day, and days of supply together in a single three-way product (line 14), and structurally all three carry an identical share of it -- doubling any one of the three doubles Total meals, and none of the three genuinely outweighs the others.
Ration type does not appear in Total meals at all -- it only changes the weight and container math applied to those meals afterward: weight per meal runs from 1.5 lb for MRE to 2.0 lb for UGR-A (line 19), units per case jumps from 12 for MRE to 50 for either UGR option (line 23), and prep water goes from a flat zero for MRE to roughly one gallon per four servings for UGR (line 27) -- switching from MRE to UGR-A adds over 1,000 gallons of preparation water at the default 200-person, 7-day, 3-meal load, a fact Total meals itself never reflects since it stays at the same 4,200 meals regardless of which ration type is selected. Pallets ties personnel count and days of supply together in the measured data, since both Cases and Total meals scale from the same three-way product before the fixed cases-per-pallet divisor is applied (line 31).
Safety Notice
This calculator provides estimates only. Always follow manufacturer guidelines, industry standards, and applicable safety codes. Incorrect application of these calculations could result in injury or property damage. When in doubt, consult a qualified professional.
Inputs
Results
Total meals
4,200
How to Use This Calculator
- Enter total personnel count and days of supply — these two inputs move Total meals the most.
- Set meals per day (typically 3) and select ration type: 0=MRE, 1=UGR-A (fresh cook), 2=UGR Heat and Serve — ration type never changes Total meals itself, only the weight and container math applied to it.
- Review Total meals and Weight (lb) for requisition quantities.
- Use Cases/modules and Pallets to plan storage and 463L pallet loading.
- Check Prep water (gal) for UGR rations to ensure water assets support feeding operations — MRE always shows zero here since it needs no on-site preparation.
How the result changes with Days of supply
| Days of supply | Total meals |
|---|---|
| 3.5 | 2,400 |
| 5.25 | 3,000 |
| 11 | 6,600 |
| 18 | 10,800 |
What each input means
- Personnel
- Total personnel to feed.
- Days of supply
- Number of days to plan for.
- Meals per day
- Meals served per person per day.
- Type (0=MRE, 1=UGR-A, 2=UGR-HS)
- 0=MRE, 1=UGR-A (fresh cook), 2=UGR Heat & Serve.
What each result means
- Total meals
- Total individual meals needed.
- Weight (lb)
- Total ration weight.
- Cases/modules
- MRE cases or UGR modules.
- Pallets
- 463L pallets for rations.
- Prep water (gal)
- Water for UGR preparation (MRE = 0).
- Daily calories
- Calories per person per day.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersPersonnel = 200, Days of supply = 7, Meals per day = 3, Type (0=MRE, 1=UGR-A, 2=UGR-HS) = 0 = 4 input(s) provided
- Calculate Total mealsTotal meals = personnelCount * mealsPerDay * daysOfSupply4200 = 4200
- Calculate WeightWeight = round(totalMeals * weightPerMeal)6300 = 6300
- Calculate Cases/modulesCases/modules = ceil(totalMeals / unitsPerCase)350 = 350
Engine last updated . Checked against 3 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Does ration type change how many total meals I need?
No. Total meals is personnel count times meals per day times days of supply (line 14), and ration type never appears in that formula. Selecting MRE, UGR-A, or UGR Heat & Serve leaves Total meals at the same 4,200 for a 200-person, 7-day, 3-meal-per-day load -- ration type only changes the weight, case count, and prep water math applied to those meals afterward.
Why does prep water jump so much when I switch from MRE to UGR rations?
Prep water is a flat zero for MRE and roughly one gallon per four servings for either UGR option (line 27), so switching from MRE to UGR-A or UGR Heat & Serve at the default 4,200-meal load adds about 1,050 gallons of preparation water where there was none before. MRE requires no on-site water preparation at all; both UGR options do, because they are cooked or reconstituted rather than eaten straight from the package.
Do UGR-A and UGR Heat & Serve need the same number of storage cases?
Yes, at a given meal count. Cases divides Total meals by units per case, which is 50 for both UGR-A and UGR Heat & Serve, compared with just 12 for MRE (line 23) -- so switching from MRE to either UGR option cuts the raw case count by more than three-quarters, even though the UGR modules themselves are physically bulkier per unit.
How much does meals per day matter compared to days of supply?
Meals per day scales Total meals by the same direct multiplication as days of supply and personnel count (line 14) -- moving from one meal a day to four quadruples Total meals at a fixed personnel count and duration. Its declared range is narrow (1 to 4) compared with days of supply's much wider range (1 to 90), which is why a realistic adjustment to days of supply usually swings the total further in absolute terms.
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