Fuel Cost Calculator Widget

Add a fuel cost calculator to your website. Travellers enter the trip distance, their car's fuel economy in L/100 km, km/L or MPG, and the pump price per litre or gallon, and see the fuel used, the total cost and each passenger's share.

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<iframe src="https://a2z.tools/embed/w/fuel-cost-calculator" title="Fuel Cost Calculator by A2Z Tools" width="100%" height="690" style="border:0;width:100%" loading="lazy" allow="clipboard-write"></iframe>

A plain iframe. Works everywhere, including site builders that strip scripts. Adjust height if your content needs more room.

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How it works

The widget uses the formula of the A2Z Fuel Cost Calculator (fuel = distance / economy, cost = fuel x price) and handles the unit mixes people actually have: distance in km or miles, economy in any of four units and a price per litre, US gallon or UK gallon. Everything is converted through litres per 100 km with the legal unit definitions - the international mile of 1.609344 km and the US gallon of 3.785411784 L listed by NIST, and the imperial gallon of 4.54609 L fixed by the UK Weights and Measures Act 1985 - so a UK driver can use miles, MPG (UK) and a price per litre together. A round-trip switch doubles the distance, the cost can be split between passengers, and the cost per km or mile is shown for comparing cars.

Calculation method

  • L/100 km = 100 / (km per L) = 235.2146 / MPG (US) = 282.4809 / MPG (UK)
  • Litres = distance in km x L/100 km / 100 (1 mile = 1.609344 km); round trip doubles the distance
  • Fuel in the price unit = litres / 1 (litre), 3.785411784 (US gal) or 4.54609 (UK gal)
  • Cost = fuel x price; per person = cost / passengers; money to 2 decimals, cost per km or mile to 3

Worked examples

European road trip

Inputs: 500 km, 7 L/100 km, 1.75 EUR per litre

Result: 35 L of fuel, 61.25 EUR, 0.123 EUR per km

500 x 7 / 100 = 35 L; 35 x 1.75 = 61.25.

US round trip shared by four

Inputs: 300 miles each way, round trip, 30 MPG (US), 3.50 USD per US gallon, 4 people

Result: 20 US gal (75.7 L), 70.00 USD in total, 17.50 USD each

600 / 30 = 20 gal; 20 x 3.50 = 70.

Limitations

  • Uses one average economy figure; hills, speed, cold starts, towing and traffic change real consumption.
  • Fuel only - no tolls, parking, wear or depreciation.
  • The pump price is the visitor's entry; the widget does not look up fuel prices.

Where publishers use it

  • Road-trip and travel blogs estimating the cost of a route
  • Car-sharing and carpool pages splitting fuel between riders
  • Car reviews comparing the running cost of two models
  • Driving-school and fleet websites

Questions

Which fuel economy unit should I pick?

Whatever your car or its review quotes: L/100 km in Europe and Australia, km/L in India and Japan, MPG (US) in the USA and MPG (UK) in Britain. The widget converts between them exactly.

Why are US and UK MPG different?

A UK (imperial) gallon is 4.54609 litres and a US gallon 3.785411784 litres, so the same car shows about 20% more miles per gallon in UK figures.

Does it include tolls or parking?

No, fuel only. Real consumption also rises with speed, heavy loads, traffic and air-conditioning.

Can I set the currency and units?

Yes. The builder sets the currency and metric or imperial units; visitors can switch units in the widget.

Sources

  1. NIST Guide to the SI, Appendix B.8 - conversion factors - National Institute of Standards and Technology (SP 811) . International mile = 1,609.344 m; US gallon (231 in^3) = 3.785411784 L
  2. Weights and Measures Act 1985, Schedule 1 - UK legislation (legislation.gov.uk) . Gallon = 4.54609 cubic decimetres

Cite or recommend this tool

If you reference this tool in an article, course or documentation, these formats are ready to copy. They are optional - nothing is added to your site unless you paste it.

A2Z Tools Fuel Cost Calculator
https://a2z.tools/fuel-cost-calculator

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