Fuel Cost Calculator for One-Way or Round Trips with Per-Person Split

Simple inputs, transparent math. This Fuel Cost Calculator for One-Way or Round Trips with Per-Person Split is built to answer one thing fast: “How much will the drive actually cost us?” You fill in the road distance, choose whether you’re planning a one-way or round trip, enter your vehicle’s fuel efficiency, and type the price you pay locally. The result shows the total fuel required, the total trip cost in your currency, and a clean per-person split so everyone can pitch in fairly.

Units and currency that match your world

Most countries use kilometers and liters; the United States commonly uses miles and mpg. The calculator detects this automatically and updates labels and the small suffix chips inside the inputs so there’s never confusion: “km” or “mi” on distance, “per L” or “per gal” on price, and the correct consumption format in the efficiency field. If your dashboard reports efficiency differently when you travel abroad, simply switch Units and continue—no separate conversion tools required.

How to think about your inputs

• Distance: use the road distance you expect to drive; round trip doubles automatically when selected.
• Consumption: enter L/100 km (lower is better) or mpg (higher is better), matching your Units choice.
• Fuel price: type what you actually pay; that keeps results grounded in your context instead of stale feeds.
• People in car: we divide the total cost by this number to show a fair split instantly.

The math at a glance

Metric path: liters = (distance_km × L/100 km) ÷ 100; total cost = liters × price per L. US path: gallons = distance_mi ÷ mpg; total cost = gallons × price per gal. For round trips, distance is doubled before either formula. Per-person is the total divided by the number of passengers. That’s it—clear, reproducible, and easy to verify with your odometer and receipts.

Fast decisions, clear breakdown

The result hero highlights the total cost and the per-person amount, then lists the key details—distance, consumption, local price, and fuel needed—in a compact summary you can scan in seconds. Because everything is input-driven, there’s nothing to update and no risk of mismatched regional data. Tap Copy summary to grab a neat line you can paste into an email or group chat. Tap Share to copy a permalink that encodes your numbers so your co-driver sees exactly the same scenario.

Practical tips for better estimates

• For mountain routes, winter tires, or heavy loads, nudge consumption up a bit for a conservative estimate.
• If prices vary across stations, round the price to today’s higher station to avoid surprises.
• Save a permalink for weekly commutes or recurring deliveries; just change distance as needed.
• Renting abroad? Switch units, enter the posted price, and you’ll get a clean estimate that matches the local market.

Note: this tool doesn’t model traffic, gradients, or weather—by design. It stays fast, private, and portable, giving you a realistic, input-based expectation in seconds. Keep your numbers honest and the output will be equally practical.