Windows Drive Exact Partition Calculator

Windows Partition Calculator

Extend Volume Calculator

Shrink Volume Calculator

How to Use this Calculator

This tool helps you calculate the exact size for creating partitions on a Windows disk.

Enter partition size in GB: File system:

Windows limits FAT32 formatting to 32GB via GUI. Use diskpart or third-party tools for larger partitions.

This tool helps you calculate the exact size for shrinking partitions on a Windows disk.

Total Size Before shrink (MB): Desired new size (GB): File system:

Extend Volume Calculator Guide

Enter your desired partition size in gigabytes (GB) in the input field
Select your filesystem type - NTFS (modern Windows) or FAT32 (for compatibility)
Click "Calculate" to see the exact size in megabytes (MB) needed
Use this MB value when creating partitions in Windows Disk Management
For FAT32 partitions larger than 32GB, you'll need to use command-line tools

Shrink Calculator Guide

Enter your Total Size Before shrink size in megabytes (MB) as shown in Disk Management
Enter your desired new size in gigabytes (GB)
Select your filesystem type (NTFS or FAT32)
Click "Calculate" to see how much space you can safely shrink
The results will show the amount to shrink and shrinked partition size

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