Fuel cost calculator

Trip fuel cost = miles ÷ miles per gallon × price per gallon.

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Trip distance (miles)

Fuel economy (miles per gallon)

More inputs and assumptions

Price per gallon

Answer

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Trip fuel cost = miles ÷ miles per gallon × price per gallon.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Step-by-step calculation

Inputs are substituted below. Each line evaluates the next operation; intermediate values are displayed to 12 significant digits while the calculation uses full precision.

Saved scenario

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Formula and assumptions

Use the same gallon definition in fuel economy and price. This is an estimate from your average economy; traffic, weather, loads, and route conditions can change consumption.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Fuel cost calculator

Trip fuel cost = miles ÷ miles per gallon × price per gallon.

Use the same gallon definition in fuel economy and price. This is an estimate from your average economy; traffic, weather, loads, and route conditions can change consumption.

Next: Basic calculator

A worked example

With trip distance (miles) = 300, fuel economy (miles per gallon) = 30, price per gallon = 4, the fuel cost is 40.

Before you use the result

Use the same gallon definition in fuel economy and price. This is an estimate from your average economy; traffic, weather, loads, and route conditions can change consumption.

Example results for trip distance (miles)

These examples use Fuel economy (miles per gallon): 30; Price per gallon: 4. They are reference calculations, not recommended settings.

Trip distance (miles)	Fuel cost
150	20
300	40
600	80

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ToolOctopus. “Fuel cost calculator.” Updated 2026-09-26. https://tooloctopus.com/fuel-cost-calculator.

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