How do I calculate RV gas cost?

Divide trip miles by RV MPG to estimate gallons used, then multiply by gas price. Add a buffer for hills, wind, generator use, and cargo weight.

What MPG should I use for an RV trip?

Use your real trip average when available. If you are planning, run a low-MPG case and a high-MPG case to create a safer budget range.

RV fuel budget

RV gas cost calculator

RV fuel budgets can swing quickly because MPG is lower and route conditions matter more. Estimate gallons, fuel cost, and a safer planning range before the trip.

Use gas calculator Gas trip formula

RV gas formula

RV fuel cost = trip miles / RV MPG x gas price

A 600-mile trip at 9 MPG uses about 66.7 gallons. At $3.80 per gallon, the fuel cost is about $253.33 before tolls, parking, or campground travel.

Use a budget range

Low case: miles / 7 MPG x price

Base case: miles / 9 MPG x price

Better case: miles / 11 MPG x price

Why RV fuel estimates vary

Hills, speed, wind, towing, roof equipment, tire pressure, generator use, traffic, and stop frequency can all change real-world fuel use. A small MPG change matters more on a long RV trip than on a short commute.

For a long drive, calculate a conservative case first. Then add tolls, park entry fees, overnight parking, and extra side trips so the total travel budget is not just the highway fuel number.

Related calculators

Road Trip Cost CalculatorAdd fuel, tolls, parking, and extras. Gas and Tolls CalculatorCombine route costs into one estimate. Gas Usage CalculatorEstimate gallons used from miles and MPG.