# Fuel Cost Calculator

Calculate how much fuel your trip will cost. Enter distance, fuel efficiency (mpg), and gas price to get total cost, gallons used, and cost per mile.

## What this calculates

Planning a road trip or daily commute? This fuel cost calculator estimates exactly how much you will spend on gas. Enter your trip distance, your vehicle's fuel efficiency in miles per gallon, and the current price per gallon to get a detailed cost breakdown including total cost, gallons consumed, cost per mile, and equivalent liters.

## Inputs

- **Trip Distance** (miles) — min 0
- **Fuel Efficiency** (mpg) — min 0.1 — Fuel efficiency. Average car is about 25 mpg or 10.6 km/L.
- **Fuel Price** ($/gal) — min 0 — Price per unit of fuel.

## Outputs

- **Total Fuel Cost** — formatted as currency
- **Fuel Used** (gal)
- **Cost Per Distance** (/mi) — formatted as currency

## Details

Here's how it works:

  - Gallons used = Distance / Fuel Efficiency (mpg)

  - Total cost = Gallons used × Price per gallon

  - Cost per mile = Total cost / Distance

Tips for better fuel economy:

  - Maintain steady speeds and avoid rapid acceleration

  - Keep tires properly inflated (under-inflation can reduce mpg by 3%)

  - Remove excess weight from the vehicle

  - Use cruise control on highways

  - Avoid excessive idling

Average fuel efficiency by vehicle type: compact cars get 30-40 mpg, mid-size sedans 25-35 mpg, SUVs 20-28 mpg, and trucks 15-25 mpg. Hybrid vehicles typically achieve 40-60 mpg.

## Frequently Asked Questions

**Q: How do I find my car's fuel efficiency?**

A: Check your vehicle's window sticker, owner's manual, or look up your make, model, and year at fueleconomy.gov. You can also calculate it by dividing miles driven by gallons used at your last fill-up.

**Q: How do I convert mpg to liters per 100 km?**

A: Divide 235.215 by your mpg value. For example, 25 mpg = 235.215 / 25 = 9.41 L/100km.

**Q: Does driving speed affect fuel cost?**

A: Yes. Most vehicles are most fuel-efficient at 45-65 mph. Above 50 mph, every 5 mph increase is roughly equivalent to paying an additional $0.15-$0.30 per gallon due to increased air resistance.

**Q: Should I factor in the return trip?**

A: This calculator computes cost for the distance entered. For a round trip, enter the total round-trip distance (double the one-way distance).

**Q: How accurate is this estimate?**

A: The estimate is based on your stated fuel efficiency, which may vary based on driving conditions (city vs highway), traffic, terrain, weather, and driving style. Actual costs may be 10-20% different from the estimate.

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Source: https://vastcalc.com/calculators/everyday/fuel-cost
Category: Everyday Life
Last updated: 2026-04-21