THE NUMBERS, EXPLAINED
How to use this calculator.
Constant observed site pace is extrapolated independently. Sites already at target have zero remaining time; sites with zero enrollment report no finite completion estimate.
Start with your inputs
Enter site enrollment targets (counts), enrolled participants to date (counts), observed recruiting days (days). Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Site enrollment targets (counts) | 100,50 |
| Enrolled participants to date (counts) | 20,25 |
| Observed recruiting days (days) | 10,5 |
A worked example
With the example inputs above, observed site pace (participants/day) is 2, 5. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Observed site pace (participants/day) | 2, 5 |
| Remaining participants by site | 80, 25 |
| Additional recruiting days by site | 40, 5 |
How this is calculated
Observed site pace (participants/day)
Divide enrollment by observed recruiting days.
Remaining participants by site
Subtract enrolled participants from target and floor at zero.
Additional recruiting days by site
Divide remaining targets by each observed pace.
Symbols and units
- a
- Site enrollment targets (counts)
- b
- Enrolled participants to date (counts)
- c
- Observed recruiting days (days)
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
Constant observed site pace is extrapolated independently. Sites already at target have zero remaining time; sites with zero enrollment report no finite completion estimate.
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?
Observed site pace (participants/day); Remaining participants by site; Additional recruiting days by site. 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: Constant observed site pace is extrapolated independently. Sites already at target have zero remaining time; sites with zero enrollment report no finite completion estimate.
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 →