01
Covered between the readings
The difference between the meter reading after and the reading before, in hours or kilometres.
Reading after − reading before
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A tool that runs on your numbers
Diesel consumption calculator from your readings
Enter the litres filled and the meter reading before and after, and your machine’s consumption appears in litres per hour or per hundred kilometres. The result is your own figure, not a benchmark for a type of machine — the formula is written under the result.
Method
The formula, item by item
The two meter readings give what the machine covered, and the litres filled are what it consumed in that period. No hidden factor and no assumed consumption.
02
Consumption in hours
The litres filled divided by the hours covered. This is the unit for heavy equipment.
L / hour = litres ÷ hours covered
03
Consumption in kilometres
The litres filled divided by the kilometres covered, times one hundred. This is the unit for vehicles.
L / 100 km = (litres ÷ kilometres covered) × 100
04
Fuel cost
The price of the litres filled divided by what the machine covered. It appears only if you enter the price per litre you paid.
Litres × price per litre ÷ covered
05
Daily average
If you enter the number of days in the period, the litres, the distance covered and the cost are divided by it to give your daily rates.
Daily average = value ÷ days in the period
Limits
What affects the accuracy of the figure
- 01The litres are right when the machine is filled to full at the first reading and to full again at the second, and you enter the litres of the second fill.
- 02A short period gives an unstable figure; the longer the period, the smaller the effect of the difference in tank level at fill-up.
- 03Consumption changes with the kind of work, the condition of the machine and its load, so the figure belongs to your period and your work only.
- 04In kilometres mode, fuel burned while idling counts toward consumption without adding distance, which raises the figure.
FAQ
What to ask before relying on the figure
No. It is your own machine’s consumption over your own readings. The calculator neither compares it with a benchmark nor assumes a consumption for the type of machine.
Whatever your machine’s meter measures. Heavy equipment is usually measured in hours, vehicles and trucks in kilometres.
Because the calculator assumes no price. The fuel price differs by where you fill up, so enter the price you paid or your own internal diesel price.
Compare it with your readings for the same machine in other periods and on the same kind of work. If it rises over time with no change in the work, that is a reason to inspect the machine and check the fills.
Inside TAC Flow
Each machine’s consumption from its recorded fills, not from a manual calculation
The calculator works from two readings you enter. Inside the platform, every diesel fill is recorded against the machine with its meter reading, so its consumption record builds up from the actual fills.
- Internal Diesel — Tanks, tankers, and documented refueling
- Fuel Card Analytics — Import provider statements and catch anomalies
- Reports Center — Cost, readiness, comparisons, and an analytics assistant