About fuelcostcalculator.io

fuelcostcalculator.io is a set of free calculators for working out what driving costs: a trip, a commute, a carpool, a mile, a month. They use US units by default (miles, mpg, gallons and dollars), show their answer as soon as you type and write the formula out on the page.

What the calculators do

Each one does simple arithmetic on the numbers you enter and shows one clear estimate. They cover trip fuel cost, gas money for a carpool, monthly fuel cost, cost per mile for cars and trucks, EV charging and electric against gas, fuel consumption and mpg to L/100km conversion. The full list is on the calculators page.

What they do not do

• They do not look up gas prices, routes or vehicle ratings. You type the numbers. Where a price field starts with a value, it is an example, and it says so.
• They do not predict what the pump will show. Real fuel use changes with speed, traffic, weather and load.
• They are not quotes, tax advice or financial advice. See the terms of use.

How the numbers are worked out

The formulas are in how fuel cost is calculated, and each calculator has a short “how this is calculated” section with a worked example. Example numbers on the pages are made up to show the arithmetic, and are labelled as examples.

Sources and credits

The calculators use no downloaded datasets and no price feeds. The constants and conventions they rely on come from these published sources:

• Litres per US gallon (3.785412) and kilometres per mile (1.609344): NIST Special Publication 811, Guide for the Use of the International System of Units, Appendix B, National Institute of Standards and Technology. Used by the mpg to L/100km converter and the fuel consumption calculator.
• 33.7 kWh per gallon of gasoline equivalent, used to convert MPGe: fueleconomy.gov, U.S. Department of Energy and U.S. Environmental Protection Agency, and AAA’s explanation of MPGe. Used by the EV vs gas cost calculator.

Report a mistake

If a result looks wrong, tell us. Say which page it was, the numbers you entered and the answer you got. See the contact page. Your data protection is covered in the privacy policy.