Fuel Cost Calculator – Trip Gas Cost
Calculate gas cost for any road trip based on distance, MPG, and gas price.
About This Calculator
Calculate gas cost for any road trip based on distance, MPG, and gas price. Use the calculator above for instant results.
Worked Examples
- Gallons: 9.375 | Cost: $37.50 | Round trip: $75
Answer: $37.50 / $75 round trip
- Gallons: 20 | Cost: $90
Answer: $90 one way
- Gallons: 40 | Cost: $152
Answer: $152 one way
Who Uses This Calculator?
Calculate gas cost before departing.
Budget monthly fuel cost.
Include gas in road trip budget.
Estimate fuel for freight routes.
Common Mistakes to Avoid
❌ Using rated MPG vs real MPG
EPA MPG is tested under ideal conditions. Real-world MPG is typically 10-20% lower. Use your actual fuel economy from the trip computer.
❌ Forgetting return trip
Multiply one-way cost by 2 for round trip unless calculating separate routes.
Frequently Asked Questions
How to improve MPG?
Drive 55-65 mph (optimal for most vehicles), maintain tire pressure, reduce AC use, remove unnecessary weight, regular maintenance.
EV cost comparison?
EV costs ~$0.03-0.04/mile vs gas car $0.12-0.15/mile. Use electricity cost calculator for EV equivalent.
Gas price apps?
GasBuddy tracks cheapest gas near you in real time.