Fuel Consumption Calculator
Calculate fuel planning requirements from vehicle types, distance, terrain, and idle time for military logistics.
About this calculator
This calculator estimates fuel demand for a vehicle fleet by combining a per-vehicle-type consumption rate with route distance, terrain, and daily idle time. Vehicle Type is the input that changes total fuel far more than any other: it selects both a driving rate and an idle rate from a six-entry lookup table spanning 18 L/100km for a HMMWV up to 380 L/100km for an M1 Abrams, with idle rates from 3 to 50 L/hr (lines 14-18), so switching from HMMWV to Abrams multiplies Total Fuel Needed by roughly eighteen times at the same vehicle count and route -- a swing that dwarfs adjusting vehicle count, distance, or terrain. Total Route Distance is treated as the distance for the whole operation and divided by Operation Duration to get a daily driving distance (line 24), which produces a genuinely two-sided effect: stretching the same total distance over more days lowers Daily Fleet Fuel (less driving each day) while raising Total Fuel Needed for the operation overall (idle fuel keeps accruing every extra day, line 28).
Daily Fuel per Vehicle is a per-vehicle figure and does not depend on how many vehicles are in the fleet at all (line 31) -- only Total Fleet Fuel and the totals below it scale with vehicle count. The model assumes every vehicle in the fleet is the same type and idles the same number of hours per day; it does not account for a mixed fleet or convoy speed limits.
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 Fuel Needed
1,602 L
≈ 11 bathtubs
How to Use This Calculator
- Enter the number of vehicles and select vehicle type — this is the single biggest driver of fuel demand, from an 18 L/100km HMMWV to a 380 L/100km M1 Abrams.
- Enter total route distance for the whole operation and a terrain factor (100% = highway, up to 250% for extreme terrain).
- Set idle hours per day (security halts, commo checks) and operation duration in days — duration divides into total distance to get the daily driving distance.
- Review Total Fuel Needed and Daily Fleet Fuel — spreading the same total distance over more days lowers the daily figure even as the total for the operation keeps rising.
- Use Tanker Loads (2500L) and Fuel Weight to plan fuel service vehicle (FSV) positioning and Class III resupply; cross-reference with the POL Calculator for multi-vehicle fleets and generator planning.
How the result changes with Number of Vehicles
| Number of Vehicles | Total Fuel Needed |
|---|---|
| 7.5 | 801 L |
| 11 | 1,175 L |
| 23 | 2,456 L |
| 38 | 4,058 L |
What each input means
- Number of Vehicles
- Number of vehicles of this type in the unit.
- Vehicle Type
- Type of military vehicle.
- Total Route Distance
- Total distance to be traveled over the operation.
- Terrain Factor
- 100% = highway, 130% = secondary road, 150% = cross-country, 200%+ = extreme terrain.
- Idle Hours per Day
- Hours per day vehicles idle (security, communication, etc.).
- Operation Duration
- Total duration of the operation.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersNumber of Vehicles = 15, Vehicle Type = 0, Total Route Distance = 200, Terrain Factor = 130 = 6 input(s) provided
- Calculate Total Fuel NeededTotal Fuel Needed1602 = 1602
- Calculate Total FuelTotal Fuel423 = 423
- Calculate Daily Fleet FuelDaily Fleet Fuel320 = 320
Engine last updated . Checked against 2 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
Why does vehicle type change fuel needs so much more than vehicle count or terrain?
Vehicle Type selects both a driving consumption rate and an idle rate from a lookup table spanning 18 L/100km for a HMMWV to 380 L/100km for an M1 Abrams, with idle rates from 3 to 50 L/hr (lines 14-18). Swapping the fleet from HMMWVs to Abrams tanks multiplies Total Fuel Needed by roughly eighteen times at the same vehicle count, distance, and terrain -- an effect no realistic adjustment to any other single input comes close to matching.
If I stretch the same route over more days, does daily fuel use go up or down?
It goes down. Total Route Distance is the distance for the whole operation, divided by Operation Duration to get a daily driving distance (line 24) -- spreading a fixed total distance over more days means less driving, and less fuel burned, each individual day. Total Fuel Needed for the whole operation still rises with more days, because idle fuel keeps accruing every extra day even as the daily driving portion shrinks.
Does the number of vehicles change how much fuel each individual vehicle burns per day?
No. Daily per Vehicle is computed entirely from vehicle type, terrain, idle hours, and route distance per day (line 31); it never references how many vehicles are in the fleet. Adding more vehicles raises Total Fuel Needed and Daily Fleet Fuel proportionally, but the per-vehicle daily figure stays the same.
Does idle time matter as much as driving distance?
Idle hours per day is a real, standalone contributor: Idle Fuel per Vehicle is idle hours multiplied by the vehicle type's idle rate (line 28), added directly to the driving fuel for that vehicle (line 31). More idle hours always raises Daily Fleet Fuel, regardless of vehicle type, route distance, or terrain -- security halts and communication checks are not free just because the convoy isn't moving.
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