How do I calculate my car's MPG?

Enter the distance traveled and the fuel used (in gallons) into the calculator. It will automatically compute your miles per gallon (MPG) by dividing distance by fuel used.

Can I use liters and kilometers?

Yes, the calculator supports metric units. Enter distance in kilometers and fuel used in liters to get fuel economy in L/100km, along with trip fuel cost and cost per kilometer.

What is cost per mile?

Cost per mile is the total fuel cost for your trip divided by the distance traveled. It helps you understand the fuel expense for each mile driven.

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即时、私密且免费

油耗计算器.

2026年8月4日

计算您车辆的每加仑英里数(MPG)、每百公里油耗(L/100km)以及行程燃油成本。

设备端计算无需注册

输入数值

输入时结果会更新。

02 / 答案

计量单位制

行驶距离

耗油量

油价

使用方法

输入行驶里程、耗油量和油价，计算您车辆的燃油经济性及本次行程的费用。

Cite this calculator

Canonical URL: https://mathify.one/zh/automotive/gas-mileage

Updated 2026年8月4日

Cite as: Mathify. (2026). 油耗计算器. https://mathify.one/zh/automotive/gas-mileage

Use Cases

Track Your Vehicle's Fuel Efficiency

Monitor your car's MPG or L/100km over time to identify changes in fuel economy, which can indicate maintenance issues or driving habit impacts.

Example: After a road trip, enter 300 miles and 10 gallons to see your MPG.

Budget for a Trip

Estimate the total fuel cost for an upcoming journey by entering the expected distance, your vehicle's typical fuel consumption, and current fuel price.

Example: Plan a 500-mile trip with a car that gets 25 MPG and gas at $3.50/gallon.

Frequently Asked Questions

How do I calculate my car's MPG?: Enter the distance traveled and the fuel used (in gallons) into the calculator. It will automatically compute your miles per gallon (MPG) by dividing distance by fuel used.
Can I use liters and kilometers?: Yes, the calculator supports metric units. Enter distance in kilometers and fuel used in liters to get fuel economy in L/100km, along with trip fuel cost and cost per kilometer.
What is cost per mile?: Cost per mile is the total fuel cost for your trip divided by the distance traveled. It helps you understand the fuel expense for each mile driven.

Tips & Common Mistakes

Tips

For accurate MPG, fill your tank completely, reset your trip odometer, and record the distance and fuel needed to refill next time.
Use the same units (imperial or metric) for both distance and fuel to avoid calculation errors.
Check your tire pressure regularly; under-inflated tires can lower fuel economy.
Compare your calculated MPG with the EPA rating for your vehicle to spot potential issues.

Common Mistakes to Avoid

Mixing units, such as entering miles with liters, which leads to incorrect results.
Using the fuel price per gallon when you entered fuel in liters, or vice versa.
Forgetting to include the fuel used for the entire trip, not just a portion.

Last updated: August 13, 2026