Fuel Cost Calculator (Free)
Estimate fuel spend for a trip or an entire fleet using miles, MPG, and fuel price. Compare scenarios (fuel price changes, MPG improvements) and export results to CSV.
Calculate fuel spend
| Period | Miles | Fuel (gal) | Fuel cost | CO₂ (kg) |
|---|
Fuel spend: the KPI fleets feel immediately
Fuel is often a top operating expense. A simple model—miles, MPG, and price—gets you 80% of the way to a usable budget. From there, fleets usually focus on the levers that actually move the number: reducing idle time, improving driving behavior, standardizing routes, and keeping maintenance tight (tires, alignment, filters).
Key fuel KPIs to track
- Fuel cost per mile: fuel price ÷ MPG (easy to explain and benchmark).
- MPG trend: track by vehicle class and route type.
- Idle time: a major driver of “effective MPG.”
- Driver behavior: speeding + harsh events increase fuel and risk.
Fuel Cost FAQ
Should I use miles per day or per month?
Either works. Miles per day is easier if you want “daily burn,” and monthly is better for budget conversations. This tool computes both.
What MPG should I use for mixed fleets?
Use a weighted average (by vehicle count or miles). For better accuracy, run the calculator separately by vehicle class (vans vs trucks).
How do I lower fuel cost per mile?
Reduce idle time, coach speeding/harsh driving, optimize routes, and maintain tire pressure/alignment. Small changes compound quickly at fleet scale.