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Fuel Cost Calculator

Work out the fuel and money a trip will take

Currency

Units

Trip Distance

Enter the trip distance

Fuel Economy

L/100 km

Enter a valid fuel economy

Fuel Price

Enter a valid fuel price

Trip Type

Trip Cost

Fuel Needed

Running Cost

Distance Driven

Fuel Price

Fuel Cost Calculator — Complete Guide

Fuel is one of the few running costs of a car that scales directly with how far you drive. That makes it easy to estimate a trip once you know three things: distance, economy and price.

What this calculator does

Enter a trip distance, your fuel economy and the local fuel price, and choose one-way or round trip. It returns the fuel needed, the total cost and the running cost per 100 km or 100 miles.

The formula

L/100 km: fuel = distance ÷ 100 × economy
MPG: fuel = distance ÷ economy
cost = fuel × price

The two unit systems work in opposite directions: in metric, a bigger economy number means more fuel used; in MPG, a bigger number means less.

A worked example

A 300 km round trip is 600 km driven. At 7.5 L/100 km that is 600 ÷ 100 × 7.5 = 45 litres. At $1.60 a litre the trip costs $72.00, and the running cost is 7.5 × 1.60 = $12.00 per 100 km.

Distance	Economy	Fuel	Cost at $1.60/L
100 km	7.5 L/100 km	7.5 L	$12.00
500 km	7.5 L/100 km	37.5 L	$60.00
500 km	5.0 L/100 km	25.0 L	$40.00

Getting closer to the real number

Use your own average, not the brochure figure. Trip computers usually give a good running average.
Speed matters. Consumption rises sharply above about 100 km/h (60 mph) because aerodynamic drag grows with the square of speed.
Load and accessories count. Air conditioning can add 5-20%; a roof box much more.
Short trips are the worst case. A cold engine runs rich, so five 4 km trips cost far more than one 20 km trip.

油费计算器完整使用指南

油费是汽车少数几个直接随行驶里程线性变化的成本之一。所以只要知道三件事 —— 距离、油耗、油价 —— 就能把一趟行程的花费估得相当准。

这个计算器能做什么

输入行程距离、油耗与当地油价，并选择单程或往返。它会给出所需油量、总花费，以及每 100 公里（或英里）的运行成本。

计算公式

L/100km：耗油量 = 距离 ÷ 100 × 油耗
MPG：耗油量 = 距离 ÷ 油耗
花费 = 耗油量 × 油价

两套单位的方向相反：公制下油耗数值越大越费油；MPG 下数值越大越省油。

算例演示

单程 300 公里、往返共行驶 600 公里。按 7.5 L/100km 计算，耗油 = 600 ÷ 100 × 7.5 = 45 升。油价 1.60 元/升时总花费 72.00 元，单位成本为 7.5 × 1.60 = 12.00 元/100 公里。

距离	油耗	耗油量	花费（1.60 元/升）
100 公里	7.5 L/100km	7.5 升	12.00 元
500 公里	7.5 L/100km	37.5 升	60.00 元
500 公里	5.0 L/100km	25.0 升	40.00 元

怎么让估算更接近真实

用自己的平均油耗，而不是宣传值。 行车电脑的长期平均值通常比较可靠。
车速影响很大。 超过约 100 公里/小时后油耗会明显上升，因为空气阻力随速度平方增长。
载重与附件也算数。 开空调可能增加 5-20%，车顶箱则更多。
短途最费油。 冷车阶段喷油偏浓，所以五次 4 公里的短途，比一次 20 公里贵得多。

Frequently Asked Questions

How do I calculate fuel cost for a trip?

Divide the distance by your fuel economy to get the fuel used, then multiply by the price per unit. At 7.5 L/100 km over 300 km you need 22.5 litres; at $1.60 a litre that is $36.00.

How do I convert MPG to L/100 km?

Divide 235.2 by the MPG figure. 30 MPG becomes 235.2 ÷ 30 = 7.84 L/100 km. The conversion is inverted — a higher MPG means a lower L/100 km.

Why is my real fuel use higher than the rated figure?

Official economy tests are run in controlled conditions. Cold starts, air conditioning, roof racks, heavy loads, short trips and aggressive driving all raise consumption, often by 15-30%.

Last reviewed: October 5, 2026 · How we calculate · Sources: US DOE fueleconomy.gov, EPA