Data Deduplication Savings Calculator
Estimate how much physical storage is used compared with the logical source size and calculate the ratio between them.
How to use this calculator
- Enter logical source data (gib), physical stored data (gib); check the units and use values from the same period or scenario.
- Review the result and intermediate values; change one input at a time when comparing scenarios.
- Keep the stated formula and assumptions with any result you share.
Formula and method
Storage reduction (%) = (logical size − stored size) ÷ logical size × 100. Deduplication ratio = logical size ÷ physical size.
- Estimated storage reduction is 64.17%, with a logical-to-physical ratio of 2.79×.
- Compare like-for-like units and time periods. Compression, snapshots, metadata, retention and provider billing can make billed storage different.
Worked examples
Worked example
1,200 GiB logical data is stored in 430 GiB.
Estimated storage reduction is 64.17%, with a logical-to-physical ratio of 2.79×.
Estimated storage reduction is 64.17%, with a logical-to-physical ratio of 2.79×.
Understanding the result
Estimated storage reduction is 64.17%, with a logical-to-physical ratio of 2.79×.
Compare like-for-like units and time periods. Compression, snapshots, metadata, retention and provider billing can make billed storage different.
Important notes
Compare like-for-like units and time periods. Compression, snapshots, metadata, retention and provider billing can make billed storage different.
Use measured inputs and verify that the model matches the situation before making an operational, financial or technical decision.
Frequently asked questions
Can savings be negative?
Yes. Physical storage may exceed logical size when overhead or low deduplication is present.
Is the ratio a provider guarantee?
No. It is calculated from the two sizes you supply.
What should I check before relying on this result?
Verify units, input definitions and assumptions against your real data or the relevant product, service or professional guidance.
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Related explanations
Learn the method behind the number or compare the terminology before using the calculator.
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This page provides a calculation tool plus explanatory information so you can understand what the result means and when the underlying method may not fit your situation.