Storage Growth Calculator
Project how large a data store becomes under a growth model you choose.
In short
Formula: Fixed amount: V = V0 + g x n. Fixed percentage: V = V0 x (1 + r)^n
What this calculator does
The user chooses the growth model; the calculator never blends or infers one. The fixed-amount model adds the same volume each period; the fixed-percentage model compounds the same rate each period. Volume added is the end volume less the starting volume.
Use it to turn Starting volume, How does your data grow?, Added each period, Growth each period, and the other shown inputs into a checked result you can compare, copy, or rerun with different assumptions.
The page shows the formula, a numeric worked example, and the assumptions that affect this professional & industry calculation.
Inputs and what they mean
- Starting volume
- — The volume you hold now..
- How does your data grow?
- — Choose the model your own measurements support. No growth model is assumed for you..
- Added each period
- — Volume added in each period..
- Growth each period
- — Percentage the volume grows by in each period, measured from your own history..
- Number of periods
- — How many periods forward you are projecting..
How to use it
- Enter your own figures — the calculator never fills in a rate, price or benchmark for you.
- Press Calculate to see the result.
- Read the formula, variables, assumptions and source below the result before you rely on it.
Formula
Fixed amount: V = V0 + g x n. Fixed percentage: V = V0 x (1 + r)^n.
Inputs used: Starting volume, How does your data grow?, Added each period, Growth each period, Number of periods.
Edge handling: Starting volume is required.; Starting volume cannot be negative.; Starting volume must be no more than 1000000000000.; Added each period is required.; Added each period cannot be negative..
Worked example
40 TB growing 6 TB a month for a year
- Start with Starting volume: 40, How does your data grow?: amount, Added each period: 6, Growth each period: 0, Number of periods: 12.
- Apply the method: Fixed amount: V = V0 + g x n. Fixed percentage: V = V0 x (1 + r)^n.
- A fixed-amount model, taken from your own measured growth.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
- Inputs outside the supported range are rejected rather than forced into a result.
- The result depends on the values you enter for this storage growth calculator; it does not supply missing rates, rules, prices, dates, or assumptions for you.
Reference: DAMA International — DAMA-DMBOK — Data Management Body of Knowledge
Last reviewed:
Common questions
Where does this formula come from?
DAMA-DMBOK data storage, integration and data-quality practice: volume growth is projected from measured history under a stated model; compression ratio is uncompressed size divided by stored size; throughput is volume processed divided by elapsed time; data currency (freshness) is the age of the data at the time it is used, measured against a stated requirement. See the source link on this page.
What kind of calculation is this?
The end volume after a stated number of periods under one explicitly chosen growth model. Check the formula, example, and limitations on this page before using the result for a real professional & industry decision.
What are its limits?
Arithmetic over the figures entered — it cannot tell whether the underlying metering, logs or job records are complete. A figure from one run or one period is a weak description of ongoing behaviour. A projection is not a forecast: it repeats the model chosen, and says nothing about whether that model will continue to hold.
How do I use the Storage Growth Calculator?
Enter the required values for Starting volume, How does your data grow?, Added each period, Growth each period, Number of periods. The calculator applies the formula on this page and shows the main result with any supporting breakdown so you can check the arithmetic.
What formula does the Storage Growth Calculator use?
Fixed amount: V = V0 + g x n. Fixed percentage: V = V0 x (1 + r)^n The visible formula section above lists the calculation path and the edge cases the page handles, so the result can be checked without relying on the form alone.
Can the Storage Growth Calculator be used for exact decisions?
Use it as a calculation aid, not as a substitute for checking the underlying rule, contract, policy, or professional advice that applies to your situation. When a result depends on local rules, personal details, prices, or dates, enter those values yourself and confirm them before acting.
Formula, source and verification
The end volume after a stated number of periods under one explicitly chosen growth model.
The question it answers: How large will this data store get, how much does compression save, and what does the retention policy cost?
The formula
Fixed amount: V = V0 + g x n. Fixed percentage: V = V0 x (1 + r)^n
- V0 — Starting volume
- (TB). Volume held now.
- g — Volume added each period
- (TB). Fixed-amount model only; measured by the user.
- r — Growth each period
- (%). Fixed-percentage model only; measured by the user.
- n — Number of periods
- (periods). How far forward the projection runs.
Units: Terabytes in, terabytes out. The period is whatever the user's growth figure was measured over.
What kind of calculation this is
Deterministic formula. The same inputs always give the same answer. The maths is fixed and does not depend on judgement.
Method
The user chooses the growth model; the calculator never blends or infers one. The fixed-amount model adds the same volume each period; the fixed-percentage model compounds the same rate each period. Volume added is the end volume less the starting volume.
Assumptions built into the result
- Mathematical: All the figures entered cover the same measurement period.
- Mathematical: Volumes, records and runs are counted consistently with the definitions the team has written down.
- Mathematical: The chosen model holds for the whole projection.
- Mathematical: Each period is the same length as the period the growth figure was measured over.
Figures this calculator will never guess for you
- No target, benchmark, industry average or typical figure is supplied for any value.
- A definition is never presented as a goal: the freshness formula is not a freshness target, and the growth formula is not a forecast of what growth should be.
- No growth rate or growth model is chosen for the user.
Limitations
- Arithmetic over the figures entered — it cannot tell whether the underlying metering, logs or job records are complete.
- A figure from one run or one period is a weak description of ongoing behaviour.
- A projection is not a forecast: it repeats the model chosen, and says nothing about whether that model will continue to hold.
Source and version
- Standard or reference
- DAMA-DMBOK — Data Management Body of Knowledge — DAMA International (DAMA-DMBOK data storage, integration and data-quality practice: volume growth is projected from measured history under a stated model; compression ratio is uncompressed size divided by stored size; throughput is volume processed divided by elapsed time; data currency (freshness) is the age of the data at the time it is used, measured against a stated requirement.)
- Published source
- DAMA International — DMBOK
- Formula version
- Version 1
- Verification
- Reviewed against the cited source on
- How much weight the source carries
- Standards or government
- Applies to
- Currency
- The result is a ratio or index, so it does not depend on currency.
Related tools
Work out the hourly rate to charge a client so that target margin is met after overhead and non-billable time.
Find the true hourly cost of an employee once benefits, payroll cost and overhead are included.
Size a software application from its data and transaction functions before estimating effort or cost.
Estimate development effort, schedule and average team size for a software project of a known size.
Express cloud spend as a cost per customer, per transaction or per other business unit.
Set the rate used to apply manufacturing overhead to jobs for the coming period.