Quick examples
Fuel efficiency
Gas mileage calculator
L / 100 km
7
Lower is more efficient
L / 100 km
7
km / L
14.29
MPG
33.6
Trip
500 km / 35 L
Fill up, reset the trip meter, then refill and enter distance + fuel for the most accurate reading.
Gas Mileage Calculator — Quick Reference
The Gas Mileage Calculator is an online tool that calculate fuel efficiency in L/100 km, km/L, and MPG from distance and fuel used. Everything for the Gas Mileage Calculator is on this page: the interactive calculator, the formula, a worked example, step-by-step guidance, and frequently asked questions — no other pages required.
At a glance
- Main inputs
- Values for this tool (amounts, dates, times, or text)
- Mode or unit options where applicable
- Main outputs
- Instant calculated result
- Breakdown or converted values where relevant
Direct answers
What is the Gas Mileage Calculator?
The Gas Mileage Calculator is an online tool that calculate fuel efficiency in L/100 km, km/L, and MPG from distance and fuel used.
What formula does the Gas Mileage Calculator use?
This calculator uses the rule: MPG = miles ÷ gallons. Enter your values in the tool above to apply it to your numbers.
How does the Gas Mileage Calculator work?
Enter distance travelled and fuel consumed. Metric mode (default) shows L/100 km and km/L; switch to imperial for MPG — with cross-conversions either way.
Formula Used
The equation below is what this calculator applies. Variable definitions follow when symbols are used.
Equation
MPG = miles ÷ gallons
Additional rules
- L/100km = (litres ÷ km) × 100
- km/L = km ÷ litres
Worked Example: 300 miles on 10 gallons
Sample inputs and the results this calculator produces for the scenario below.
Inputs
- Distance
- 300 mi
- Fuel
- 10 gal
Results
- MPG
- 30
Fill the tank between measurements for the most accurate MPG.
How Gas Mileage Calculator Works
Enter distance travelled and fuel consumed. Metric mode (default) shows L/100 km and km/L; switch to imperial for MPG — with cross-conversions either way.
What to enter
Use the calculator above to set your amounts, rates, and tenure. Results update as you move sliders or type values — switch currency if you are planning in USD, INR, or another supported unit.
Step-by-step
- Enter your values in the Gas Mileage Calculator above.
- Results update instantly as you change inputs.
- Use the worked example and formula below to verify the math.
- Share or bookmark the link — your inputs stay in the URL.
Mileage — Frequently Asked Questions
Each question is answered directly below. Expand any item for the full response.
How does the gas mileage calculator work?
MPG = miles ÷ gallons. L/100 km = (litres ÷ km) × 100. km/L = km ÷ litres. Fill the tank between measurements for best accuracy.
Does the gas mileage calculator cost anything?
No signup or payment is required. All tools run in your browser. Your inputs can be shared via the URL.
Can I share my results?
Yes. Inputs are stored in the page URL so you can bookmark or share the same calculation with others.
Do you store my data?
No. Calculations happen locally in your browser. We do not save your inputs on our servers.
Disclaimer
- This calculator gives you an estimate only. It is not a promise of exact results.
- This is general information, not personal financial, tax, or legal advice.
- You are responsible for your own decisions. Talk to a qualified professional when it matters.
- Everyday tools use standard formulas and charts. For legal, medical, or engineering decisions, confirm with a qualified professional.
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