Deduplication Savings Calculator
Calculate the data reduction, bandwidth saved and transfer time cut by WAN deduplication and compression.
About Deduplication Savings Calculator
Deduplication removes repeated blocks and compression shrinks what remains, so the two multiply rather than add. Transfer time falls in direct proportion to the bytes that actually cross the link. Replication and backup windows are usually the reason a DCI or branch circuit gets upgraded, and a 6:1 effective ratio can defer that upgrade entirely.
Formula
Deduplication Savings
effective ratio = dedup ratio × compression ratio; saving % = 1 − 1 ÷ effective ratio.
- dedup ratio
- Ratio of logical bytes to unique bytes seen by the optimiser
- compression ratio
- Further reduction applied to the unique bytes
Worked example
With the default values below, Deduplication Savings Calculator returns Bandwidth Saved of 83.33%. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Data to transferaccepts 0.1–1,000,000 GB
- 500 GB
- Deduplication ratio (x:1)accepts 1–100 x
- 3 x
- Compression ratio (x:1)accepts 1–20 x
- 2 x
- WAN link rateaccepts 1–400,000 Mbps
- 100 Mbps
Results
- Bandwidth Saved
- 83.33%
- Bytes Actually Sent
- 83.33 GB
- Bytes Avoided
- 416.67 GB
- Transfer Time Unoptimised
- 11.11 hours
- Transfer Time Optimised
- 1.85 hours
- Effective Reduction Ratio
- 6:1
Step by step
- 1Values used
- 2Deduplication Savings
- 3Bandwidth Saved= 83.33
- 4Bytes Actually Sent= 83.33 GB
- 5Bytes Avoided= 416.67 GB
- 6Transfer Time Unoptimised= 11.11 hours
- 7Transfer Time Optimised= 1.85 hours
- 8Effective Reduction Ratio= 6:1
Assumptions and limits
- The result is derived only from the 4 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 2 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 Deduplication Savings calculated?
effective ratio = dedup ratio × compression ratio; saving % = 1 − 1 ÷ effective ratio. Deduplication removes repeated blocks and compression shrinks what remains, so the two multiply rather than add. Transfer time falls in direct proportion to the bytes that actually cross the link.
Why does Deduplication Savings matter?
Replication and backup windows are usually the reason a DCI or branch circuit gets upgraded, and a 6:1 effective ratio can defer that upgrade entirely.
What values do I need to enter?
This calculator takes 4 inputs: Data to transfer, Deduplication ratio (x:1), Compression ratio (x:1), WAN link rate. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.