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Fuel Cost Calculator NZ: Trip Cost, Weekly Commute, or Annual Spend

Our Fuel Cost Calculator with vehicle profile presets helps you work out trip cost, weekly cost or annual fuel spending.
Updated 3 May 2026

Overview
  • Petrol prices in New Zealand have been on a wild ride in recent months, with 91 octane crossing $3.40 per litre in early 2026 due to ongoing volatility in international oil markets.
  • For households running one or two vehicles, fuel is now one of the largest controllable spending categories. 
  • Our Fuel Cost Calculator helps you work out exactly what a trip, a weekly commute, or your annual driving habit costs in fuel - and lets you compare petrol, diesel, and EV running costs directly.

How to Use Our Fuel Cost Calculator

The calculator works as a four-step journey:
  • Step 1: Pick a vehicle profile: Choose the closest match to your car (small petrol, family petrol, ute/4WD, diesel, hybrid, or electric). Each profile pre-fills a typical fuel efficiency for that vehicle category. You can override the number with your car's actual efficiency if you know it. Toggle between L/100km and km/L if you prefer the other unit; the value converts automatically.
  • Step 2: Enter your distance: Type in the one-way distance for your trip. Tick "Return trip" to double the distance for round-trip journeys (most journeys in real life).
  • Step 3: Confirm the fuel price: The default reflects the current New Zealand average for your fuel type. Adjust to match what you actually pay if you fill up at a discount station or charge from solar.
  • Step 4: Choose your frequency: "One-off trip" calculates the cost of a single journey. "Weekly commute" multiplies your trip across days per week and weeks per year, giving you the weekly and annual fuel cost - the figure that actually matters for budgeting.

​The result panel at the bottom shows your total cost, distance covered, fuel used, and cost per kilometre. The cost-per-km figure is the most useful comparison metric across vehicle types and trip lengths.

Fuel Cost Calculator

Work out what your trip or weekly commute will cost in fuel. Pick a vehicle, enter your distance, and see the total.

1 Vehicle
2 Distance
3 Fuel price
4 How often?
This trip will cost $23.80
Distance 200 km
Fuel used 7.0 L
Cost per km $0.119

Three things worth knowing about fuel costs in New Zealand

1. Diesel looks cheaper per litre but isn't always cheaper to run
  • Diesel typically costs $1 less per litre than petrol, but diesel vehicles also pay Road User Charges (RUC) and once you factor in RUC, diesel often costs about the same per kilometre as petrol for ordinary drivers.
  • Diesel makes the most financial sense for high-mileage drivers (over 25,000 km per year), where the engine efficiency advantage starts to outweigh the RUC cost.
  • The calculator above shows pure fuel cost; if you drive a diesel, add roughly 7-8 cents per km for RUC to get your total running cost.
​
2. EVs are dramatically cheaper to fuel than petrol cars at home
  • Charging an EV at home at $0.39/kWh costs around $5-7 per 100 km, compared to $25-30 per 100 km for petrol at current prices - over 15,000 km per year, roughly $3,000 in annual fuel savings.
  • The catch is public charging - fast chargers can cost $0.60-0.90/kWh, which still beats petrol but narrows the gap considerably.
  • For households that charge mostly at home overnight, EVs offer the largest fuel cost reduction available in New Zealand today.

3. Hybrid vehicles capture most of the EV efficiency benefit without the charging concern
  • Toyota's hybrid range, for example, achieves around 4.5 L/100km in mixed driving - roughly half the consumption of an equivalent non-hybrid.
  • At current petrol prices, that's a saving of around $7-10 per 100 km compared to a similar petrol-only car.
  • Hybrids don't need to be plugged in and don't suffer from range anxiety, making them a practical bridge between petrol and full EVs for households that aren't ready to commit to charging infrastructure.
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