Fuel Cost Calculator: How Much Will Your Trip or Monthly Gas Cost?
NextCodeHub Automotive Team
Trip Cost Formula:
Total Trip Fuel Cost = (Distance ÷ Fuel Efficiency) × Fuel Price per Unit
Monthly Gas Budget = (Total Monthly Miles ÷ Combined MPG) × Gas Price
How to Calculate Fuel Cost for Any Trip
Planning a holiday road trip, weekend getaway, or long-distance family visit? Calculating your fuel cost in advance prevents unpleasant surprises at the pump and allows you to split travel expenses fairly with fellow passengers.
Here is how the calculation works in 3 quick steps:
- Determine Total Journey Distance: Measure the one-way distance using Google Maps or GPS, and double it if you are planning a round trip (e.g. 300 km one-way = 600 km round trip).
- Determine Fuel Required: Divide distance by your car's fuel mileage (e.g. 600 km ÷ 15 km/L = 40 Liters needed).
- Multiply by Fuel Price: Multiply liters needed by local fuel station rates (e.g. 40 Liters × $1.50/L = $60.00 total fuel cost).
You can calculate this immediately with our free fuel cost calculator.
How Much Petrol Is Required for 100 km and 300 km?
Two of the most common travel distances are 100 kilometers and 300 kilometers. Here is exactly how many liters of petrol you need depending on your vehicle:
| Vehicle Type | Fuel Mileage (km/L) | Petrol Needed (100 km) | Petrol Needed (300 km) | Est. 300 km Cost ($1.50/L) |
|---|---|---|---|---|
| Hybrid Car (Prius) | 22.0 km/L | 4.5 Liters | 13.6 Liters | $20.40 |
| Compact Hatchback (1.3L) | 16.0 km/L | 6.25 Liters | 18.75 Liters | $28.13 |
| Midsize Sedan (1.8L–2.0L) | 13.5 km/L | 7.4 Liters | 22.2 Liters | $33.30 |
| Crossover / SUV (2.5L) | 10.0 km/L | 10.0 Liters | 30.0 Liters | $45.00 |
| 125cc Motorcycle | 45.0 km/L | 2.2 Liters | 6.7 Liters | $10.05 |
How Much Is 6, 8, and 14.5 Gallons of Gas?
If you are pulling up to a gas pump or budgeting a fill-up, here is a quick price matrix for popular tank volumes across various gas prices per gallon:
| Gas Volume (Gallons) | At $3.00 / Gal | At $3.50 / Gal | At $4.00 / Gal | At $4.50 / Gal |
|---|---|---|---|---|
| 6 Gallons (Quarter Tank / Compact) | $18.00 | $21.00 | $24.00 | $27.00 |
| 8 Gallons (Half Tank / Sedan) | $24.00 | $28.00 | $32.00 | $36.00 |
| 12 Gallons (Compact Tank Fill) | $36.00 | $42.00 | $48.00 | $54.00 |
| 14.5 Gallons (Standard Midsize Tank) | $43.50 | $50.75 | $58.00 | $65.25 |
| 20 Gallons (SUV / Truck Tank) | $60.00 | $70.00 | $80.00 | $90.00 |
How to Calculate Your Monthly Gas Budget
How much does monthly gas cost for an average driver? In North America, the average commuter drives 1,000 to 1,200 miles per month. Here is how to calculate your personal monthly gas budget:
Monthly Gas Budget Example:
- Work Commute: 30 miles round trip × 22 work days = 660 miles
- Weekend & Errands: ~340 miles
- Total Monthly Distance: 1,000 miles
- Car Fuel Economy: 28 MPG
- Gasoline Required: 1,000 miles ÷ 28 MPG = 35.7 gallons
- Local Gas Price: $3.60 per gallon
- Monthly Gas Budget: 35.7 gallons × $3.60 = $128.52 per month
Plan and Budget with NextCodeHub Calculators
Take total control of your automotive budget with our suite of 100% free online calculators:
- Gas Price Calculator — Track how price changes affect your monthly budget.
- Fuel Cost Calculator — Instant trip fuel cost estimator with unit toggles.
- Fuel Expense Calculator — Comprehensive fuel expense planning.
Frequently Asked Questions
How do you calculate fuel cost for a journey?
To calculate fuel cost for a trip: Divide total trip distance by your vehicle's fuel efficiency to find liters or gallons needed, then multiply by the fuel price. Formula: Fuel Cost = (Distance ÷ Mileage) × Fuel Price.
How much petrol is required for 100 km and 300 km?
For an average car getting 14 km/L (7.14 L/100km): 100 km requires approximately 7.1 liters of petrol; 300 km requires approximately 21.4 liters. A hybrid car (22 km/L) needs only 4.5 liters for 100 km and 13.6 liters for 300 km.
How much is 8 gallons of gas?
At an average price of $3.50 per gallon: 8 gallons of gas costs $28.00. At $3.00/gal it is $24.00, and at $4.00/gal it is $32.00.
How much is 6 gallons and 14.5 gallons of gas?
At $3.50 per gallon: 6 gallons of gas costs $21.00; 14.5 gallons (a typical full sedan tank) costs $50.75. At $4.00 per gallon, 14.5 gallons costs $58.00.
How do you calculate your monthly gas budget?
To calculate your monthly gas budget: Multiply your average daily commute miles by 30 (or work days by 22), add monthly weekend driving, divide by your car's MPG to get monthly gallons used, and multiply by local gas price. Formula: Monthly Gas Budget = (Monthly Miles ÷ MPG) × Gas Price.