How to Convert 32-bit VBA Code to 64-bit in 3 Minutes (Excel)

Written by Kasper Langmann

The world of programming is constantly evolving, and with it, the need to adapt and update our code. One such update that many Excel users face is the transition from 32-bit VBA code to 64-bit. This transition is essential to take advantage of the increased processing power and memory capacity that 64-bit systems offer. But how do you make this transition smoothly and quickly? In this guide, we will walk you through the process of converting your 32-bit VBA code to 64-bit in just three minutes.

Understanding the Difference Between 32-bit and 64-bit

The first step in this transition is understanding the difference between 32-bit and 64-bit systems. In simple terms, the bit version of a system refers to how much data it can process at once. A 32-bit system can handle 4GB of RAM, while a 64-bit system can handle a whopping 18.4 million TB of RAM. This massive increase in processing power and memory capacity allows 64-bit systems to run more complex and demanding applications, making them the preferred choice for many developers.

However, this increased capacity comes with a caveat. 64-bit systems require more complex code to take full advantage of their capabilities. This means that 32-bit VBA code, which was designed for a simpler system, may not run as efficiently or even at all on a 64-bit system. Hence, the need to convert your 32-bit VBA code to 64-bit.

Preparing for the Conversion

Before you start the conversion process, there are a few things you need to do. First, you need to ensure that your system is capable of running 64-bit applications. Most modern computers are, but it’s always a good idea to check. You can do this by going to your system information and checking the system type.

Next, you need to backup your 32-bit VBA code. This is a crucial step as the conversion process can sometimes lead to data loss. By backing up your code, you ensure that you have a fallback option in case something goes wrong.

Finally, you need to familiarize yourself with the differences in syntax between 32-bit and 64-bit VBA code. While the overall structure of the code remains the same, there are some key differences in how certain functions and commands are written. Understanding these differences will make the conversion process much smoother.

The Conversion Process

Step 1: Identify the Code That Needs Conversion

The first step in the conversion process is identifying the parts of your code that need to be converted. Not all 32-bit VBA code will run into issues on a 64-bit system. In fact, most of it will run just fine. However, there are certain functions and commands that are specific to 32-bit systems and will need to be updated.

These include any API calls, any code that uses the Declare statement, and any code that uses the Long data type. Once you’ve identified these parts of your code, you can move on to the next step.

Step 2: Update the Syntax

Once you’ve identified the parts of your code that need to be converted, the next step is to update the syntax. This involves replacing any 32-bit specific functions and commands with their 64-bit equivalents.

For example, any API calls will need to be updated to use the PtrSafe attribute, and any Declare statements will need to be updated to use the LongPtr data type. This process can be time-consuming, but it’s essential for ensuring that your code runs smoothly on a 64-bit system.

Step 3: Test Your Code

After you’ve updated the syntax, the final step is to test your code. This involves running your code on a 64-bit system and checking for any errors or performance issues. If you encounter any problems, you’ll need to go back and check your code for any mistakes or oversights.

Once your code runs smoothly, congratulations! You’ve successfully converted your 32-bit VBA code to 64-bit.


Converting 32-bit VBA code to 64-bit may seem like a daunting task, but with the right preparation and understanding, it can be done quickly and efficiently. By following the steps outlined in this guide, you can make the transition smoothly and take full advantage of the increased processing power and memory capacity that 64-bit systems offer.

Remember, the world of programming is constantly evolving, and staying up-to-date with these changes is key to staying relevant and efficient in your work. So don’t be afraid of these changes, embrace them, and use them to your advantage.