Fuel Consumption Calculator. Free, Fast and Accurate.
Every driver has felt this. You filled up four days ago, drove your usual roads at your usual pace, and you are already back at the pump paying more than you expected. That gap between what fuel should cost and what it actually costs is exactly what this calculator closes.
Enter your distance, your fuel used, and your preferred unit. Your real consumption rate appears in under 10 seconds, based on your actual driving not a manufacturer test figure. This page also covers the formula, what a good result looks like for your vehicle type, and the six factors that push your number higher than it should be.
| Full Breakdown | |
|---|---|
| Miles Driven | — |
| Gallons Used | — |
| Gas Price | — |
| MPG | — |
| Cost Per Mile | — |
| Annual Gas Cost (est.) | — |
| CO2 This Period | — |
| IRS Deduction Breakdown | |
|---|---|
| Business Miles x $0.70 | — |
| Medical Miles x $0.21 | — |
| Charity Miles x $0.14 | — |
| Total Deduction | — |
| Estimated Tax Savings | — |
Tax information is for educational purposes only and does not constitute tax advice. Consult a qualified tax professional. See IRS Publication 463 for rules.
How to Use This Fuel Consumption Calculator
Getting an accurate result takes four steps and under 30 seconds. The calculator works with any unit you prefer, whether you measure in litres, gallons, miles, or kilometres. The most common mistake is estimating instead of recording, so use your pump receipt and your odometer every time.
Fill Your Tank
Fill completely before you start tracking. Drive your normal route, then fill again at the end of the period you want to measure. The volume on that second receipt is your fuel used figure.
Enter Distance and Fuel
Type in the exact distance you drove and the exact volume from your receipt. One litre off on a short trip shifts your L/100km result by half a point. Use the real number, not an estimate.
Chose Your Unit
Choose L/100km for Australia, Canada, or Europe. Choose MPG for the USA or UK. Choose KM/L for South or Southeast Asia.
Add Fuel Price
Type in your local price per litre or per gallon and the calculator adds a total trip cost. Pair this with our fuel cost calculator to plan any journey before you leave.
Fuel Consumption Formula Explained
The fuel consumption formula divides fuel used by distance traveled, then arranges the result in your chosen unit. You only need two inputs: how far you went and how much fuel you used to get there. Every unit on this site comes from the same two numbers rearranged in a different direction.
L/100km = (Fuel Used in Litres / Distance in km) x 100
MPG US = Distance in Miles / Fuel Used in US Gallons
KM/L = Distance in km / Fuel Used in Litre
A lower L/100km means better efficiency. A higher MPG or KM/L means better efficiency. Most fuel economy research uses L/100km as its standard unit because it scales linearly, meaning double the L/100km equals double the fuel cost at any price per litre.
Real Trip Example
A Toyota Camry drove 450 km and used 38 litres of petrol. Divide 38 by 450 and multiply by 100 to get 8.44 L/100km. At $1.85 per litre, that trip cost $70.34 in fuel. Our monthly fuel cost calculator scales this across your full monthly distance automatically.
Convert L/100km to MPG
Divide 235.2 by your L/100km figure to get US MPG. An 8.0 L/100km car gives 29.4 MPG. Use our fuel unit converter to switch between all formats without doing the math yourself.
What Is a Good Fuel Consumption Rate?
For a standard petrol car, under 8.0 L/100km or above 29 MPG is considered good in real-world mixed driving. These benchmarks come from EPA fuel economy testing and transport department vehicle data across multiple markets. The right number depends on your vehicle class because comparing a pickup truck to a compact car on the same scale tells you nothing useful about either one.
Always compare your result against a vehicle in the same class and engine size range as yours. A number that looks high for a sedan can be excellent for a full-size SUV towing a trailer. Use the table below to find the right benchmark for your specific vehicle type.
| Vehicle Type | L/100km | MPG | Rating |
| Compact Car | 6.5 to 7.5 | 31 to 36 | Good |
| Mid-size Car | 7.5 to 9.5 | 25 to 31 | Good |
| SUV Compact | 8.5 to 10.5 | 22 to 28 | Average |
| Pickup Truck | 12.0 to 16.0 | 15 to 20 | Class normal |
| Hybrid Car | 3.5 to 5.5 | 43 to 67 | Excellent |
Cars
A compact petrol car like a Honda Civic achieves 6.5 to 7.5 L/100km in mixed driving. Anything above 10.0 L/100km for a standard passenger car points to a maintenance issue worth addressing.
Trucks
A full-size pickup like a Ford F-150 V8 uses 12.0 to 16.0 L/100km under real conditions. Use our truck fuel calculator for a figure specific to your spec and load.
SUVs
A compact SUV like a Toyota RAV4 sits at 8.5 to 10.5 L/100km. A large body-on-frame SUV runs 13.0 to 17.0 L/100km depending on engine size.
Motorcycles
Most motorcycles achieve 3.0 to 5.0 L/100km, which equals 47 to 79 MPG. A 250cc commuter can reach 2.5 L/100km in steady riding.
What Affects Your Fuel Consumption?
Six factors move your fuel consumption number more than anything else, and three of them cost nothing to fix today. Each factor compounds with the others, so a car with low tyre pressure, a dirty air filter, and an aggressive driver can use 30 to 40 percent more fuel than the same car maintained and driven smoothly. Understanding each one helps you target the changes that give you the fastest return on your next fill.
RealSpeed
Wind resistance increases with the square of your speed. At 70 mph you fight 36 percent more aerodynamic drag than at 55 mph.
Engine Type
A 1.5-litre turbocharged engine can match a 2.5-litre naturally aspirated engine for power while using less fuel. Diesel engines extract more energy from each litre than petrol at the same distance.
Tyre Pressure
Driving 6 PSI below recommended pressure increases fuel consumption by upto 3 percent. Check the sticker inside your driver door, not the maximum printed on the tyre sidewall.
Air Conditioning
AC adds 5 to 20 percent to your fuel consumption at city speeds. At highway speeds above 60 mph, AC with windows closed costs less than open windows because drag from open windows exceeds the compressor load.
City vs Highway
A car achieving 7.5 L/100km on the highway can hit 11.0 to 12.0 L/100km in dense city traffic, covering the same total distance.
Load and Towing
Every extra 100 lbs of weight increases fuel consumption by roughly 1 percent. A truck towing 5,000 lbs can see consumption nearly double compared to the same route driven empty.
How to Reduce Your Fuel Consumption
Five changes give you the best return for your effort, and none require buying a new car or replacing any major part. Most drivers skip these checks without realizing how much extra fuel they burn on every fill because of them. Start with the first two, and you will see the difference on your next pump receipt.
Hold Steady Speed
Driving 60 mph instead of 75 mph on a 400-mile trip reduces fuel consumption by up to 20 percent. That difference compounds on every long drive you take.
Check Tyre Pressure
Check pressure every two weeks and before any long trip. Correct pressure gives you a free 1 to 3 percent fuel saving with no other change required.
Service Your Engine
A faulty oxygen sensor alone can increase fuel consumption by up to 40 percent, according to EPA data. Fresh spark plugs and a clean air filter each contribute 1 to 4 percent.
Remove Extra Weight
A car carrying 200 lbs of unnecessary weight in the boot costs 2 percent more in fuel on every trip. Remove roof racks when you are not using them.
Plan Your Route
The fuel-efficient route on Google Maps or Waze can use 8 to 12 percent less fuel than the fastest route in heavy stop-and-go traffic.
Fuel Consumption by Vehicle Type
A pickup truck at 13.0 L/100km is performing well for its class. A compact car at 13.0 L/100km has a real problem worth investigating. Always compare your calculator result against the correct benchmark for your vehicle type. A single universal number tells you nothing useful when the vehicles it covers range from a 1.0-litre city car to a 6.2-litre V8 truck.
Petrol Car
Small petrol cars run 5.5 to 7.5 L/100km. Mid-size petrol cars sit at 7.5 to 9.5 L/100km. Track your cost with our cost per mile calculator.
Diesel Car
A modern diesel car achieves 4.5 to 7.0 L/100km, which is 15 to 30 percent better than an equivalent petrol model. The trade-off is a higher fuel price per litre in most markets.
SUV and 4×4
Compact SUVs run 8.0 to 11.0 L/100km. Full-size SUVs sit at 11.0 to 16.0 L/100km. Switching to two-wheel drive on sealed roads saves 1 to 3 L/100km.
Pickup Truck
Mid-size diesels like a Toyota Hilux achieve 7.5 to 10.0 L/100km. Full-size American pickups run 12.0 to 17.0 L/100km under load. Use our truck fuel calculator for a spec-specific figure.
Motorcycle
Most 250cc to 500cc commuter bikes achieve 2.8 to 4.5 L/100km. Large displacement V-twin cruisers sit at 5.5 to 8.0 L/100km.
Hybrid Car
A Toyota Prius in city driving achieves 3.5 to 5.0 L/100km, where the electric motor handles low-speed acceleration most efficiently. On pure highway driving at 75 mph, hybrid efficiency drops and often matches a good diesel on the same route.
Frequently Asked Questions
Common questions about fuel consumption answered with real numbers and plain explanations. If your question is not here, the related calculators below can help you find the exact figure you need.
Related Calculators
Enter any distance and your fuel efficiency for a full cost breakdown before you leave home.
Monthly Fuel Budget CalculatorScale your per-trip result across your monthly and annual driving distance in one step.
Fleet Fuel Cost CalculatorCalculate fuel costs across multiple vehicles at once for fleet managers and transport companies.
Start Tracking Your Fuel Consumption Today
Your fuel consumption number tells you exactly how efficiently your vehicle uses every litre or gallon you put into it. Compare your result against the benchmarks on this page for your vehicle class, address the six factors that move your number, and use the calculators linked above to track cost across any trip, month, or year. Small changes to speed, tyre pressure, and maintenance give you the fastest return. This calculator gives you the baseline to measure whether those changes are actually working.