How much does sharing help?

Proportionally — four people in one car pay a quarter each. It is the single largest saving available on any given journey.

Fuel Cost Calculator

Journey cost, one way and return, split per person.

Written and maintained by Mohit PatelLast checked August 4, 2026How we build these

Currency

Distance

Fuel efficiency

Distance per unit of fuel — km/L or miles/gallon.

Fuel price per unit

People sharing

Fuel cost one way

$30.00

20 units of fuel · $60.00 return

Fuel needed20

Cost one way$30.00

Cost return$60.00

Cost per unit of distance$0.1000

Per person$30.00

Efficiency here is distance per unit of fuel — km per litre or miles per gallon — not litres per 100 km, which is its reciprocal. Mixing the two is the commonest error in fuel calculations and produces an answer wrong by a large factor rather than a small one. Fuel is also only part of the cost of driving: depreciation, tyres and servicing typically add more again per mile.

How the Fuel Cost Calculator works

Efficiency here is distance per unit of fuel — km per litre or miles per gallon — rather than litres per 100 km, which is its reciprocal. Mixing the two produces an answer wrong by a large factor, and it is the commonest error in fuel calculations.

Also known as: trip cost calculator · petrol cost calculator · gas cost for a trip · journey cost estimator

Where to go next

The Fuel Cost question rarely arrives on its own. These are the ones that usually come with it:

Gas Mileage Calculator — US mpg, imperial mpg, km/L and L/100km, converted properly.
Split Bill Calculator — Per person with tip, and what rounding up leaves over.
Percentage Calculator — Every common percentage question in one place.
Age Calculator — Exact age in years, months, days, and total units.

Sources

Frequently asked questions

How do I calculate fuel cost for a trip?

Divide the distance by the fuel efficiency to get the fuel needed, then multiply by the price. 300 km at 15 km/L needs 20 litres.

Should I use km/L or L/100km?

Either, but not interchangeably. They are reciprocals. This page expects distance per unit of fuel; if your figure is litres per 100 km, convert it first.

Is fuel the real cost of driving?

Only part of it. Depreciation, tyres, servicing and insurance typically add more again per mile, which is why reimbursement rates are well above fuel alone.

Put this calculator on your own site

Free to use, on any site, commercial or not. Paste this where you want it to appear. It is a plain iframe, so it works in WordPress, Squarespace, Wix, Webflow, Ghost and anything else that accepts HTML.

The one-line version

<iframe src="https://www.thecalclibrary.com/embed/fuel-cost-calculator" width="100%" height="640" style="border:1px solid #e2e8f0;border-radius:12px" loading="lazy" title="Fuel Cost Calculator"></iframe>
<p style="font:13px/1.5 system-ui,sans-serif;margin:6px 0 0;color:#64748b">Powered by <a href="https://www.thecalclibrary.com/fuel-cost-calculator" style="color:#64748b">Fuel Cost Calculator</a> from The Calc Library</p>

The only condition is that the credit line below the frame stays in place. That one line is what pays for the tool being free — it is how anyone else finds it.