FSx Storage Calculator
Cost an FSx file system from SSD capacity, throughput capacity, backups, Multi-AZ and deduplication savings.
Inputs
Multi-AZ mirrors capacity and throughput into a second Availability Zone, modelled here as a 2x multiplier.
Monthly File System Cost
$3,717.76
Storage Capacity Cost
$1,064.96
Throughput Capacity Cost
$2,252.80
Backup Cost
$400.00
Logical Data It Can Hold
7,447GB
Cost per Logical GB
0.4992USD per GB-month
Step by step
Values used
Provisioned storage capacity = 4,096 GB; SSD storage price = 0.1300 USD per GB-month; Provisioned throughput capacity = 512 MBps; Throughput capacity price = 2.20 USD per MBps-month; Backup data retained = 8,000 GB; Backup storage price = 0.0500 USD per GB-month; Deploy Multi-AZ = Yes; Data deduplication and compression savings = 45 %
FSx Storage
cost = (GB x storage rate + MBps x throughput rate) x Multi-AZ factor + backup GB x backup rate; logical capacity = GB ÷ (1 − dedup ratio).
Monthly File System Cost
= 3,717.76
Storage Capacity Cost
= 1,064.96
Throughput Capacity Cost
= 2,252.80
Backup Cost
= 400.00
Logical Data It Can Hold
= 7,447 GB
Cost per Logical GB
= 0.4992 USD per GB-month
How it works
FSx bills provisioned capacity and provisioned throughput as two independent dials, and throughput capacity also determines the file server's network and cache limits rather than only its bandwidth. Multi-AZ mirrors both dials into a second Availability Zone, so it roughly doubles the compute and storage line before backups are counted. Deduplication is what makes the real cost per logical GB far lower than the sticker rate on general-purpose file shares — and every rate here is a user-supplied list price to confirm on the AWS FSx pricing page for your region. Throughput capacity is usually the surprise on an FSx bill: at a couple of dollars per MBps-month it can outweigh the storage line entirely, and it is the one dial teams over-provision by habit.
Formula
FSx Storage
cost = (GB x storage rate + MBps x throughput rate) x Multi-AZ factor + backup GB x backup rate; logical capacity = GB ÷ (1 − dedup ratio).
- MBps
- Provisioned throughput capacity, which also sets network and cache limits
- dedup ratio
- Fraction of bytes removed by deduplication and compression
Frequently Asked Questions
How is FSx Storage calculated?
cost = (GB x storage rate + MBps x throughput rate) x Multi-AZ factor + backup GB x backup rate; logical capacity = GB ÷ (1 − dedup ratio). FSx bills provisioned capacity and provisioned throughput as two independent dials, and throughput capacity also determines the file server's network and cache limits rather than only its bandwidth. Multi-AZ mirrors both dials into a second Availability Zone, so it roughly doubles the compute and storage line before backups are counted. Deduplication is what makes the real cost per logical GB far lower than the sticker rate on general-purpose file shares — and every rate here is a user-supplied list price to confirm on the AWS FSx pricing page for your region.
Why does FSx Storage matter?
Throughput capacity is usually the surprise on an FSx bill: at a couple of dollars per MBps-month it can outweigh the storage line entirely, and it is the one dial teams over-provision by habit.
What values do I need to enter?
This calculator takes 8 inputs: Provisioned storage capacity, SSD storage price, Provisioned throughput capacity, Throughput capacity price, Backup data retained, Backup storage price, Deploy Multi-AZ, Data deduplication and compression savings. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.
Does throughput capacity affect anything besides bandwidth?
Yes. It sizes the file server's memory cache and network throughput too, so raising it can improve metadata-heavy workloads even when the raw bandwidth was never the bottleneck.