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 desired partition size in GB.
Select your filesystem type (NTFS or FAT32).
Click "Calculate" to get size in MB.

Shrink Calculator Guide

Enter total size before shrink in MB.
Enter desired new size in GB.
Select filesystem type.
Click "Calculate" to see shrink details.

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