THE NUMBERS, EXPLAINED
How to use this calculator.
Capture is serial and storage follows source duration. Postprocessing is also serial and starts after capture; no codec quality recommendation.
Start with your inputs
Enter tape running times (minutes), capture speed (source minutes per real minute), postprocessing time per tape (minutes), captured storage rate (gb/source hour). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Tape running times (minutes) | 60,90 |
| Capture speed (source minutes per real minute) | 1 |
| Postprocessing time per tape (minutes) | 10 |
| Captured storage rate (GB/source hour) | 12 |
A worked example
With the example inputs above, capture time (minutes) is 150. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Capture time (minutes) | 150 |
| Total active workflow time (minutes) | 170 |
| Required storage (GB) | 30 |
How this is calculated
Capture time (minutes)
Divide source running time by capture speed.
Total active workflow time (minutes)
Add per-tape postprocessing.
Required storage (GB)
Multiply source hours by storage per hour.
Symbols and units
- a
- Tape running times (minutes)
- b
- Capture speed (source minutes per real minute)
- c
- Postprocessing time per tape (minutes)
- d
- Captured storage rate (GB/source hour)
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
Capture is serial and storage follows source duration. Postprocessing is also serial and starts after capture; no codec quality recommendation.
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?
Capture time (minutes); Total active workflow time (minutes); Required storage (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: Capture is serial and storage follows source duration. Postprocessing is also serial and starts after capture; no codec quality recommendation.
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 Prealgebra 2e — arithmetic 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 →