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Fuel Cost Calculator

Last updated: March 19, 2026
Reviewed by: LumoCalculator Team

Estimate one-way trip fuel cost, recurring commute budgets, cost per mile or kilometer, and tailpipe CO2 from distance, fuel price, vehicle efficiency, and optional route fees.

Fuel Inputs

$
$

Fuel Cost Summary

One-way trip total

$3.13

0.893 gallons burned | 7.93 kg CO2

Daily

$6.25

1 round trip

Weekly

$31.25

5 round trips

Monthly

$137.50

22 round trips

Yearly

$1,562.50

250 round trips

Fuel used

0.893 gallons

Fuel-only cost

$3.13

Cost per mile

$0.125

Current Calculation

Fuel used = distance (miles) / MPG

25.00 / 28.00 = 0.893 gallons

Fuel cost = fuel used x price per unit

0.893 x $3.50 = $3.13

One-way total = fuel cost + additional costs

$3.13 + $0.00 = $3.13

Monthly commute = round-trip total x 22

$6.25 x 22 = $137.50

CO2 = gallons burned x 8.887 kg

0.893 x 8.887 = 7.93 kg

Breakdown

One-way distance25.00 miles
Fuel price$3.50 per gallon
Efficiency28.00 MPG
Fuel used0.893 gallons
Fuel-only cost$3.13
Additional one-way costs$0.00
One-way total$3.13
Round-trip total$6.25
Monthly commute budget$137.50
CO2 per one-way trip7.93 kg

Related Calculators

Use Scenarios

Daily commute budgeting

Use the one-way distance for a regular work route when you want a quick daily, weekly, monthly, and yearly fuel budget built from the same commute assumption.

Single-route trip planning

Enter the current pump price and the route length to estimate how much one leg of a day trip, airport run, or client visit is likely to cost.

Gas vs. home charging check

If you are comparing a gasoline route with an electric alternative, pair this page with the Electricity Cost Calculator so both sides of the comparison use current energy prices.

Formula Explanation

1) MPG mode

Fuel used = distance (miles) / MPG

Use this when your vehicle efficiency is listed in miles per gallon. The page converts kilometer inputs to miles before the fuel-use step.

2) Metric mode

Fuel used = distance (km) x L/100 km / 100

Use this when your efficiency number is shown as liters per 100 kilometers. Lower L/100 km means less fuel burned for the same route.

3) One-way total

Trip total = fuel cost + extra route fees

Fuel cost is calculated in gallons or liters to match your price unit, then any one-way tolls or other route fees are added.

4) Commute budget

Daily = one-way total x 2

Weekly, monthly, and yearly commute numbers assume 5, 22, and 250 round trips. Use the one-way total for single-trip planning.

How to Read the Result

One-way total

Treat this as the cleanest single-route planning number. It combines fuel burned on the route with any extra one-way fees you entered.

Recurring commute cards

These turn the one-way route into a round-trip workday and then scale that amount to 5, 22, and 250 commuting days for fast budgeting.

Cost per distance and CO2

Cost per mile or kilometer helps compare vehicles or routes, while the CO2 figure gives a simple tailpipe comparison for the same drive.

Example Cases

Case 1: Short toll commute

Inputs

  • Distance: 18.00 miles
  • Fuel price: $3.65 per gallon
  • Efficiency: 31.00 MPG
  • Extra one-way costs: $1.75

Computed Results

  • One-way total: $3.87
  • Daily commute: $7.74
  • Monthly commute: $170.25
  • CO2: 5.16 kg

Interpretation

This case shows how a moderate toll can change the total more than a small MPG difference on a shorter route.

Decision Hint

Use this setup when a recurring fee is part of the commute and you want to test whether an alternate route is worth the time tradeoff.

Case 2: Metric weekend route

Inputs

  • Distance: 120.00 kilometers
  • Fuel price: $1.78 per liter
  • Efficiency: 7.40 L/100 km
  • Extra one-way costs: $6.50

Computed Results

  • One-way total: $22.31
  • Daily commute: $44.61
  • Monthly commute: $981.48
  • CO2: 20.85 kg

Interpretation

This route is better read as a single-trip planning number because the recurring commute multipliers would overstate a once-a-week drive.

Decision Hint

If your fuel price moves often, rerun this case with a new pump price instead of relying on an older average.

Case 3: Less efficient SUV commute

Inputs

  • Distance: 26.00 miles
  • Fuel price: $3.90 per gallon
  • Efficiency: 22.00 MPG
  • Extra one-way costs: $0.00

Computed Results

  • One-way total: $4.61
  • Daily commute: $9.22
  • Monthly commute: $202.80
  • CO2: 10.50 kg

Interpretation

Compared with a more efficient sedan, the per-mile cost rises quickly on a longer daily route even before tolls or parking are added.

Decision Hint

Use a case like this to compare two vehicles, or to estimate the savings from driving the same route with gentler speeds and fewer short cold starts.

Boundary Conditions

The distance field is treated as a one-way route. Daily, weekly, monthly, and yearly commute budgets then assume a round trip based on that same route length.
Additional costs are handled as one-way route fees. If a charge happens once per day instead of once per direction, adjust the extra-cost input so the commute budget matches your real pattern.
The CO2 estimate is a tailpipe-only gasoline estimate based on fuel burned. It does not include refinery, delivery, maintenance, or manufacturing emissions.
The calculator focuses on fuel and route fees only. Insurance, depreciation, maintenance, tire wear, and financing are outside this page.
MPG and L/100 km are different efficiency systems. Make sure the selected efficiency unit matches the number from your dashboard, window sticker, or trip computer.
Recurring budget cards are planning shortcuts, not guarantees. Traffic, weather, idling, cargo, tire pressure, and seasonal fuel blends can move the real cost up or down.

Sources & References

Frequently Asked Questions

Do I enter one-way distance or round-trip distance?
Enter the one-way route length. The primary card shows the one-way total, while the commute cards then apply a round-trip assumption for daily, weekly, monthly, and yearly budgeting. If you already know the full out-and-back route cost for a single trip, enter the full route distance and focus on the one-way total card only.
What is the difference between MPG and L/100 km?
MPG measures how far the vehicle goes on one gallon, so higher is better. L/100 km measures how many liters are burned to cover 100 kilometers, so lower is better. The calculator supports both systems and converts distance internally so you can keep the efficiency number in the format your vehicle uses.
Should tolls or parking be included?
Include only the route fees you want attached to this calculation. Tolls, ferry charges, and route-specific access fees fit naturally. Parking can also be included, but because the page treats the extra-cost field as one-way by default, you should adjust that number if the parking charge happens once per day rather than once per direction.
Why do the monthly and yearly numbers look much larger than the trip total?
The recurring budget cards are not simple multiples of the one-way route. They first convert the one-way trip into a daily round trip, then multiply that daily number by 5 workdays, 22 workdays, and 250 workdays for weekly, monthly, and yearly planning.
How accurate is the CO2 estimate?
It is useful for planning and comparisons, but it is still an estimate. The page uses gasoline burned on the route and a standard tailpipe factor, which means it does not capture fuel blending differences, cold starts, upstream emissions, or the emissions from owning and maintaining the vehicle.
Can I use this for electric vehicles or full cost-of-ownership analysis?
Not directly. This page is designed for gasoline fuel cost planning. If you are comparing a gas commute with home charging, pair it with an electricity-cost workflow. If you need total ownership analysis, add insurance, maintenance, depreciation, and financing outside this calculator.