Free

Details

  • Released
  • Updated
  • July 2, 2019
  • February 21, 2026

Features

e85Cal screenshot #1 for iPhone
e85Cal screenshot #2 for iPhone
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About

This app assists users in calculating the precise amounts of standard and ethanol gasoline needed to achieve a desired ethanol percentage in their fuel mix. It simplifies the process by taking into account tank size, current fuel level, and the ethanol content of available fuel types.

Calculate ethanol percentage goal
Enter gas tank size
Input standard pump gas ethanol %
Input ethanol pump gas ethanol %
Set target ethanol % mix
Enter current fuel level %
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What's New in e85Cal

7.0

February 21, 2026

• Bug fixes

User reviews

Pretty good

I really like the fuel percentage feature on the app and seems very accurate because it includes the decimals unlike others. I hope there will be an option to change the screen to dark mode. Overall , i really like it. Thank you

Great app but could use one simple improvement

This app is definitely the best out there, thank you for making our lives easier. I am saying this as a recommendation for a small feature. I’m not sure if others have the same problem, but it would be nice to be able to set the target fuel amount in the tank.

Right now, the calculator gives you the number of gallons to add in order to get to a full tank. But for those that are racing competitively and maybe don’t want the added weight of a full tank, it would be nice to say, for example: “I want 1/2 full of a tank and I’m at 1/4, how much ethanol and pump gas do I need to add?”

Hopefully that make sense. Thanks!
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Fantastic!

I’ve been using this for quite awhile now and it works great! I guess the math doesn’t lie but I’m always surprised at how accurate to my target it is.

App Enhancement

This app is excellent. The best app that I have found. The layout is perfect to easily enter default information. The slide bar was a brilliant idea to enter the key variable whenever you go to fill up. Much quicker than typing in the % of fuel remaining in the tank.

Enhancement that would really finish/polish this app:
The E85 stations in my area (NJ) do not allow you to pump in a specific number of gallons. You have to enter the dollar amount of fuel that you want, and exactly that dollar amount is pumped into the tank.

So the current app forces me to exit and use the calculator app to multiply the number of gallons times the price per gallon.

A great enhancement would be to add default fields for the price per gallon of ethanol and of gasoline. Then in the calculated results show the gallons of ethanol needed along with its total cost. And do the same for gasoline results.

Hope that you will consider this enhancement. It would make your app the absolute easiest/quickest to use when pulling in to a station to fill up. Right now, I park on the side first to use the app and then the calculator app to have the total price before pulling up to the pump. Don’t want to be that jerk who isn’t prepared and takes forever while other people are waiting to get gas.

Thanks again!
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No lie

Ima be honest i paid for 3 different and this is the easiest and best effective one for ios
So simple and effective can’t go wrong strongly recommend thanks for the creativity

Developer apps

FAQ

How does e85Cal help me calculate my ethanol percentage goal?

e85Cal guides you through entering your gas tank size, the ethanol percentage in standard and ethanol pump gas, your target ethanol mix, and your current fuel level. It then provides the exact gallons or liters of each fuel type to add.

What information do I need to use e85Cal?

You will need to know your vehicle's gas tank size, the ethanol percentage of the regular and high-ethanol gas you have access to, your desired final ethanol percentage, and your current fuel level percentage.

Is e85Cal available on Android devices?

Based on the provided information, e85Cal is currently supported on iPhone and iPod devices. Compatibility with Android devices is not specified.

How often is e85Cal updated?

The latest version of e85Cal is 7.0, and it was last updated on February 21, 2026. This indicates a recent update and ongoing development for the application.

What is the user rating for e85Cal?

e85Cal has a strong user rating of 4.7 stars, based on 35 ratings. This suggests a high level of user satisfaction with the app's functionality and ease of use.

Does e85Cal have ads?

No, e85Cal does not contain advertisements. The application is free to use and does not display any ads to its users.

What is the age rating for e85Cal?

e85Cal has an age rating of 4+. This means it is suitable for users of all ages, with no age restrictions.

Can e85Cal calculate blends other than ethanol?

The description for e85Cal specifically focuses on calculating ethanol percentage goals. It is designed to help users determine the correct mix of standard and ethanol gasoline.