Fuel Cost Calculator
Before setting off on a trip, it helps to know what it will cost in fuel. Enter the distance, your car's consumption (usually L per 100 km) and the current fuel price to instantly see the amount and the litres needed. This helps you budget, compare transport options, or justify mileage reimbursement for business travel.
結果
￥55.5
Total fuel cost
- Litres needed
- 30 L
- Average cost per km
- ￥0.11
How this was calculated
- 1Litres needed(500 ÷ 100) × 6 = 30 L
- 2Cost per litre30 L × ￥1.85 = ￥55.5
公式
Litres = (Distance ÷ 100) × Consumption. Cost = Litres × Price per litre
A car's consumption is usually given per 100 kilometres, not per kilometre. That's why you first divide distance by 100 to find how many times that consumption applies, multiply by the consumption figure for the number of litres, then multiply by price per litre. Driving style, speed, load weight and tyre pressure can make real consumption differ from the factory figure by 10–20%.
ステップ解説
- 1Enter the distance (one way or round trip).
- 2Enter your car's consumption in L/100km (from registration or on-board computer).
- 3Enter the current fuel price per litre (petrol/diesel).
- 4Read off the total cost and litres — perfect for budget planning!
計算例
Daily commute: 50 km, consumption 5 L/100km, petrol € 1.75/L
→ (50 ÷ 100) × 5 = 2.5 litres × 1.75 € = € 4.38 per day
Holiday trip: 500 km, consumption 6 L/100km, diesel € 1.70/L
→ (500 ÷ 100) × 6 = 30 litres × 1.70 € = € 51 total one way
Business trip: 1,200 km, consumption 7.5 L/100km, fuel € 1.85/L
→ (1,200 ÷ 100) × 7.5 = 90 litres × 1.85 € = € 166.50 total
Reference table
| Consumption | At € 1.70/L | At € 1.90/L |
|---|---|---|
| 4 L/100km (very efficient) | € 6.80 | € 7.60 |
| 6 L/100km (average car) | € 10.20 | € 11.40 |
| 8 L/100km (SUV) | € 13.60 | € 15.20 |
| 10 L/100km (large car) | € 17.00 | € 19.00 |
Multiply these values by the number of hundred-kilometres for your trip total cost.
よくある間違い
- Entering consumption in km/litre (backwards!) instead of L/100km — this gives completely wrong results.
- Calculating only the outward trip and forgetting a return journey doubles the total.
- Using factory consumption for city driving (much worse in practice) or motorway figures for local traffic.
活用シーン
- Plan a holiday trip and budget: calculate in advance how much you'll spend on fuel.
- Compare driving with train/bus: calculate fuel costs and compare with ticket prices.
- Justify mileage reimbursement: prove business trips with cost calculations and receipts.
よくある質問
How do I convert km/litre to L/100km?
Divide 100 by your km/litre figure. Example: 16.7 km/L becomes 100 ÷ 16.7 ≈ 6 L/100km. Many US cars have km/L specs, but Europe uses L/100km. This calculator requires L/100km.
How can I find my car's real-world consumption?
Three ways: (1) Trip computer — many cars show current consumption on the dashboard; (2) Manual tracking — divide litres filled at pump by km driven; (3) Average over multiple fill-ups — more reliable. City driving is always higher than motorway driving.
Is electric driving really cheaper than petrol?
Usually yes, per kilometre. Electricity typically costs EUR 0.15–0.20 per kWh, while petrol is EUR 0.15–0.20 per litre and average cars use 6L per 100km — so EUR 0.09–0.12 per km for fuel vs EUR 0.03–0.05 per km for electricity. But cars have a high upfront cost. Use the electricity calculator to compute precisely for your rates.
Does this calculator include maintenance and depreciation?
No, only fuel costs. Your real cost per km is higher because you also need to cover maintenance, insurance, registration, wear-and-tear, and depreciation. This tool shows the fuel component. For full analysis, add roughly EUR 0.10–0.20 per km extra for other costs.
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