Click the System Report button. If you do not see this button, click More Info, then scroll down and click the System Report button.
On the Hardware panel, locate the Processor Name. If you're using a Mac with an M1 or M2 chip, a Processor Name will not be listed; instead, you will see a Model Number and Chip. All M1 and M2 Macs use 64-bit architecture.
If you're using an Intel-based processor, you can use the chart below to identify your processor type.
To determine the system type for Windows
On the keyboard, hold down the Windows Key and press the letter R.
In the Run dialog that displays, type in msinfo32 and click OK.
In the System Information dialog that displays, on the System Summary panel, locate the System Type.
System Type x64-based PC means that you have a 64-bit system.
System Type x86-based PC means that you have a 32-bit system.