GasCap: Gas Cost Calculator

DonParker

About this app

Stop guessing at the pump. GasCap is the free gas cost calculator that tells you exactly how much fuel you need and what it'll cost — before you pull up.

Just enter your tank size, your current fuel level, and how full you want to go. GasCap instantly shows the gallons you'll add and your total cost using real local gas prices. No more overpaying, no more "fill it and hope." It's the simplest way to know your fill-up cost in advance.

WHY DRIVERS LOVE GASCAP
• Gas cost calculator — know your exact fill-up cost before you swipe your card
• Real-time local gas prices so your estimate matches the pump
• A fuel calculator that works offline — calculate anywhere, even with no signal
• Rental Car mode — return it at the right fuel level and skip the pricey refueling fee
• MPG tracker — log every fill-up and watch your gas mileage and fuel economy over time
• Save your vehicles for one-tap calculations

POWERFUL TOOLS FOR EVERY DRIVER
• Fill-up cost calculator: how much gas to add and what you'll pay
• Budget calculator: enter a dollar amount and see how many gallons it buys
• Road trip cost estimator: plan fuel costs before you hit the road
• Tank calculator: figure your fuel needs for any tank size
• Fuel tracker & history: see your gas money spending and MPG trends month to month

PERFECT FOR
• Anyone on a budget who's tired of overpaying for gas
• Rideshare and delivery drivers watching every gallon and every dollar
• Road trips, rental cars, and weekend getaways
• Commuters tracking fuel costs, gas mileage, and monthly gas spending

Whether you call it a gas calculator, fuel cost calculator, gas price checker, MPG tracker, or gas money planner — GasCap puts the numbers in your pocket so you always know before you go.

100% free to use. No surprises at the pump.

GasCap™ — gascap.app

What’s new

Welcome to GasCap — the free gas cost calculator. Know exactly how much fuel you need and what it'll cost before you fill up.
• Instant fill-up cost using real local gas prices
• Budget mode — see how many gallons your dollars buy
• MPG tracking & fill-up history
• Rental Car mode — return at the right level, skip the refuel fee
• Works offline
Know before you go.