THE NUMBERS, EXPLAINED
How to use this calculator.
Assumes constant event volume and packed size-based partitions across the whole retention window. These are not daily partitions. Indexes, replication, compression, filesystem overhead and partial-day expiry are excluded.
Start with your inputs
Enter events per day, bytes per event, retention days, target bytes per partition. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Events per day | 1000000 |
| Bytes per event | 200 |
| Retention days | 30 |
| Target bytes per partition | 1000000000 |
A worked example
With the example inputs above, bytes per day is 200,000,000. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Bytes per day | 200,000,000 |
| Retained bytes | 6,000,000,000 |
| Partitions | 6 |
| Retained storage (decimal GB) | 6 |
How this is calculated
Bytes per day
Events per day × bytes per event.
Retained bytes
Daily bytes × retention days.
Partitions
Round up retained bytes ÷ target partition bytes.
Retained storage (decimal GB)
Retained bytes ÷ 1,000,000,000.
Symbols and units
- a
- Events per day
- b
- Bytes per event
- c
- Retention days
- d
- Target bytes per partition
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Assumes constant event volume and packed size-based partitions across the whole retention window. These are not daily partitions. Indexes, replication, compression, filesystem overhead and partial-day expiry are excluded.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Bytes per day; Retained bytes; Partitions; Retained storage (decimal GB). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Assumes constant event volume and packed size-based partitions across the whole retention window. These are not daily partitions. Indexes, replication, compression, filesystem overhead and partial-day expiry are excluded.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
OpenStax: percentages and proportions ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
Read the quality report →