FSx Storage Calculator
Cost an FSx file system from SSD capacity, throughput capacity, backups, Multi-AZ and deduplication savings.
About FSx Storage Calculator
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
Worked example
With the default values below, FSx Storage Calculator returns Monthly File System Cost of $3,717.76. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Provisioned storage capacityminimum 32 GB
- 4,096 GB
- SSD storage priceminimum 0 USD per GB-month
- 0.13 USD per GB-month
- Provisioned throughput capacityminimum 8 MBps
- 512 MBps
- Throughput capacity priceminimum 0 USD per MBps-month
- 2.2 USD per MBps-month
- Backup data retainedminimum 0 GB
- 8,000 GB
- Backup storage priceminimum 0 USD per GB-month
- 0.05 USD per GB-month
- Deploy Multi-AZ
- Yes
- Data deduplication and compression savingsaccepts 0–95 %
- 45 %
Results
- 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
Step by step
- 1Values used
- 2FSx Storage
- 3Monthly File System Cost= 3,717.76
- 4Storage Capacity Cost= 1,064.96
- 5Throughput Capacity Cost= 2,252.80
- 6Backup Cost= 400.00
- 7Logical Data It Can Hold= 7,447 GB
- 8Cost per Logical GB= 0.4992 USD per GB-month
Assumptions and limits
- The result is derived only from the 8 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 4 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
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.