Fuel Cost Calculator
Estimate a trip’s fuel, cost and tailpipe CO₂ with explicit metric, US or UK gallon units. Each unit mode keeps a separate draft.
1 mi = 1.609344 km; 1 US gal = 3.785411784 L; 1 UK gal = 4.54609 L. Switching modes restores its draft; it does not convert prices or change currency.
Advanced settings
CO₂ = liters × the editable kg/L factor. Default 2.31 is an illustrative gasoline assumption, not a verified vehicle or lifecycle factor. Use an appropriate factor for your fuel. The efficiency bar is a 0–15 L/100 km visual scale only, not a vehicle rating.
Enter a nonnegative decimal, up to 16 digits and 6 decimal places. No grouping or exponent; point decimals and locale comma decimals are supported. Distance ≤1,000,000,000; consumption ≤10,000; price ≤1,000,000; factor ≤100.
Result
- Fuel needed
- Total cost
- Cost per distance
- CO₂
Exact arithmetic, rounded only for display: costs to 2 decimals, other values to 3 (unit cost to 4); ≈ marks rounding. Currency is a label, with no exchange or billing rule.
Method and limits
Metric fuel = distance × L/100 km ÷ 100. MPG fuel = miles ÷ MPG. Price must use the selected volume unit; round trip doubles distance.
1 mi = 1.609344 km; 1 US gal = 3.785411784 L; 1 UK gal = 4.54609 L. Switching modes restores its draft; it does not convert prices or change currency.
CO₂ = liters × the editable kg/L factor. Default 2.31 is an illustrative gasoline assumption, not a verified vehicle or lifecycle factor. Use an appropriate factor for your fuel. The efficiency bar is a 0–15 L/100 km visual scale only, not a vehicle rating.
Exact arithmetic, rounded only for display: costs to 2 decimals, other values to 3 (unit cost to 4); ≈ marks rounding. Currency is a label, with no exchange or billing rule.
Calculations stay in the page, with no calculator storage. Copy sends the current valid summary after your action; normal site scripts may load.
Copied
Copy failed. Select the result and copy it manually.
About Fuel Cost Calculator
Estimate a trip’s fuel, cost and tailpipe CO₂ with explicit metric, US or UK gallon units. Each unit mode keeps a separate draft.
100 km at 8 L/100 km and 2 per L needs 8 L and costs 16; round trip needs 16 L and costs 32. 100 miles at 25 MPG needs 4 of the chosen gallons.
Enter a nonnegative decimal, up to 16 digits and 6 decimal places. No grouping or exponent; point decimals and locale comma decimals are supported. Distance ≤1,000,000,000; consumption ≤10,000; price ≤1,000,000; factor ≤100.
Use Cases
How to use
Metric fuel = distance × L/100 km ÷ 100. MPG fuel = miles ÷ MPG. Price must use the selected volume unit; round trip doubles distance.
1 mi = 1.609344 km; 1 US gal = 3.785411784 L; 1 UK gal = 4.54609 L. Switching modes restores its draft; it does not convert prices or change currency.
Pro Tips
- CO₂ = liters × the editable kg/L factor. Default 2.31 is an illustrative gasoline assumption, not a verified vehicle or lifecycle factor. Use an appropriate factor for your fuel. The efficiency bar is a 0–15 L/100 km visual scale only, not a vehicle rating.
Frequently Asked Questions
The gallons differ in volume. Keep consumption and price in the same gallon family; identical MPG numbers do not mean identical liters consumed.
No distance was driven, so dividing by zero is undefined. Fuel and trip cost can still be zero; zero MPG is always invalid.