THE NUMBERS, EXPLAINED
How to use this calculator.
Duplicates are removed before screening; each remaining record and full-text review receives the specified independent reviewer count. Adjudication is excluded.
Start with your inputs
Enter retrieved records (count), confirmed duplicates (count), title-abstract screening (minutes/record), full-text reviews (count), full-text review time (minutes/record), independent reviewers per record (count), combined reviewer capacity (hours/day). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Retrieved records (count) | 1000 |
| Confirmed duplicates (count) | 200 |
| Title-abstract screening (minutes/record) | 1 |
| Full-text reviews (count) | 100 |
| Full-text review time (minutes/record) | 10 |
| Independent reviewers per record (count) | 2 |
| Combined reviewer capacity (hours/day) | 10 |
A worked example
With the example inputs above, reviewer workload (hours) is 60. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Reviewer workload (hours) | 60 |
| Completion workdays (days) | 6 |
How this is calculated
Reviewer workload (hours)
Add screening and full-text minutes, multiply independent reviewers and convert to hours.
Completion workdays (days)
Divide reviewer-hours by daily combined capacity and round up.
Symbols and units
- a
- Retrieved records (count)
- b
- Confirmed duplicates (count)
- c
- Title-abstract screening (minutes/record)
- d
- Full-text reviews (count)
- e
- Full-text review time (minutes/record)
- f
- Independent reviewers per record (count)
- g
- Combined reviewer capacity (hours/day)
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
Duplicates are removed before screening; each remaining record and full-text review receives the specified independent reviewer count. Adjudication is 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?
Reviewer workload (hours); Completion workdays (days). 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: Duplicates are removed before screening; each remaining record and full-text review receives the specified independent reviewer count. Adjudication is 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 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 →