How much space does an index typically consume?

A B-tree index on a single 4-byte integer column consumes roughly 50–100 bytes per row including overhead (page pointers, transaction visibility data). A table with 10 M rows may have a 500 MB index.

What fill factor should I use?

Fill factor 100% minimises index size but causes page splits on inserts. For OLTP with frequent updates on indexed columns, use fill factor 70–80 to leave room for updates and reduce bloat.

B-Tree Index Space Overhead Calculator

Estimate on-disk space consumed by a B-tree index given row count, key column size(s), and fill factor. Useful for capacity planning and identifying bloated indices.

Networking

Algorithms

Binary & Number

Systems

Dev Metrics

IP Subnet Calculator

IP Address

CIDR Prefix

Network

192.168.1.0

Broadcast

192.168.1.255

Subnet Mask

255.255.255.0

First Host

192.168.1.1

Last Host

192.168.1.254

Usable Hosts

254

Binary breakdown:

IP: 11000000.10101000.00000001.00000000

Mask: 11111111.11111111.11111111.00000000

Net: 11000000.10101000.00000001.00000000

How to Use

Enter the values for the patient or scenario you are assessing. Estimate on-disk space consumed by a B-tree index given row count, key column size(s), and fill factor. Useful for capacity planning and identifying bloated indices. Use the b-tree index space result to inform your clinical assessment.

B-Tree Index Space Overhead Calculator

IP Subnet Calculator

How to Use

Frequently Asked Questions

How much space does an index typically consume?

What fill factor should I use?