Features  /  Supported Formats  / 

Converting GRO to CAL

GRO and GRB are image formats associated with a brand of calculators released by HP during the 1990s for advanced mathematical operations. The HP 48 and the HP 49 were both programmable and very popular among science professionals. At the moment, such files are considered uncommon and obsolete, so in case you found an old one on your computer it's probably best to convert it to a more popular extension.

A CAL image file represents a monochrome bitmap image that uses the CALS raster image standard for storing graphics data. This standard was created in the 1980s by the US Department of Defence as a compressed interchangeable image format. CAL and CALS are extensions used for similar purposes.

So, how to change GRO into CAL?

The quick and simple way to handle your files is to get a quality piece of software, such as reaConverter. Although it is fast, this software is extremely efficient in managing a wide range of conversions. As you will soon realize, reaConverter will help you avoid spending countless hours trying to figure out how to convert GROs. But at the same time, it will allow you to apply a wide range of editing options.

Download and Install reaConverter

reaConverter is quick to download, install and launch, and you don't need to be an IT specialist in order to understand in a few minutes how it operates.

reaConverter
Install reaConverter

Load GRO Files

Start reaConverter and load all the .gro files you intend to convert into .cal because, as opposed to most free online converters, reaConverter supports batch conversion. So you can save the time and energy you would lose with doing repetitive operations.

Select GROs from a folder or by drag-and-dropping them directly into the reaConverter window.

Choose Output Folder

Go to the Saving options tab and decide where you want to save new .cal files. You can also spend a few more moments to apply additional editing to the images prepared for conversion.

Select CAL as Output Format

Then pick the CAL as output format. To help you do this, a series of buttons is conveniently placed at the bottom of the reaConverter window, so you can simply press on the one you need or click Plus button to add new options.

Then simply press the Start button and your conversion will begin in no time!

Try Free Trial Version

Video tutorial

Command-line interface

Advanced users can convert GRO to CAL via command-line interface in manual or automated mode. You are welcome to contact our technical support when you have any questions about reaConverter.

Download reaConverter Pro with CLI

Share

reaConverter

Highly efficient batch GRO to CAL converter that makes it easy to handle huge number of files and folders in a few simple operations.

Try for Free!