How to Calculate Gas for Miles

Fuel-efficient cars require less gas.

Before a trip, you typically want to know how much the trip will cost. One of the biggest costs is the cost of gas for the trip if you are driving. If you know how many miles you are traveling and your miles per gallon of your car, then you can calculate the amount of gas you will need in gallons. Once you know the amount of gas you need, you can determine about how much it will cost.

Instructions

1. Determine your car's miles per gallon and the number of miles you are going to drive. For example, assume your car gets 30 miles per gallon and you are going to drive 400 miles.

2. Divide the number of miles you will drive by the miles per gallon. This is the needed gallons for the trip. In the example, 400 miles divided by 30 miles per gallon equals 13.33 gallons.

3. Multiply your gallons by an estimate of how much gas costs. In the example, assume gas costs $3.50 per gallon, so $3.50 per gallon times 13.33 gallons equals a trip cost of $46.66.

References

• Miles Gallon: Convert Miles to Gallons