Fuel Cost Calculator
Last updated: 2026-06-25
Fuel cost = distance ÷ fuel economy × fuel price. For example, driving 30 km at 12 km/L and 1,700 won/L is 30 ÷ 12 × 1,700 = 4,250 won.
Enter the one-way distance and this calculator shows the one-way and round-trip fuel cost plus a monthly (round-trip × 22 days) commuting cost.
Enter Trip Details
Round-trip fuel cost
0 won
| Item | Value |
|---|---|
| One-way fuel needed | |
| One-way fuel cost | |
| Round-trip fuel cost | |
| Monthly fuel cost (round-trip × 22 days) |
This is an estimate for reference. Real-world fuel economy varies with city/highway driving, air conditioning, and load, and fuel prices change frequently.
How to Use
- Enter the distance — enter the one-way distance (km).
- Enter fuel economy and price — enter the car's fuel economy (km/L) and the current fuel price (won/L).
- Check the result — press Calculate to see the one-way and round-trip fuel cost and the monthly (round-trip × 22 days) cost.
How Fuel Cost Is Calculated
Fuel cost is found by dividing the distance by fuel economy to get the fuel needed (L), then multiplying by the fuel price (won/L). The formula is fuel cost = distance ÷ fuel economy × fuel price. For the same distance, higher fuel economy and lower fuel prices mean lower cost.
| Fuel economy | One-way cost | Round-trip cost |
|---|---|---|
| 8 km/L | 6,375 won | 12,750 won |
| 12 km/L | 4,250 won | 8,500 won |
| 16 km/L | 3,188 won | 6,375 won |
| 20 km/L | 2,550 won | 5,100 won |
The monthly fuel cost is the round-trip cost multiplied by the number of commuting days (this calculator uses 22 days for a 5-day week). If you don't know your fuel economy precisely, find your real-world economy first with the fuel economy calculator using distance and actual fuel added, then use that value.
Frequently Asked Questions (FAQ)
How is fuel cost calculated?
Fuel cost = distance ÷ fuel economy × fuel price. For example, driving 30 km in a 12 km/L car at 1,700 won/L costs 30 ÷ 12 × 1,700 = 4,250 won.
How do I get the round-trip fuel cost?
Round-trip fuel cost is the one-way cost multiplied by 2. This calculator shows both one-way and round-trip when you enter the one-way distance, and converts the round-trip into a monthly (22 weekday) commuting cost.
What if I don't know my fuel economy?
Use the combined fuel economy from your vehicle registration or the manufacturer's catalog. For more accuracy, find your real-world fuel economy with the fuel economy calculator using distance and actual fuel added, then enter that value. Real-world economy varies with city/highway driving and air conditioning use.
How many days is the monthly fuel cost based on?
The monthly fuel cost here is round-trip fuel cost × 22 days (a 5-day-per-week commute). If your commuting days differ, adjust the result proportionally.
Related Calculators & Guides
Last updated: 2026-06-25