What is the Study Recruitment Duration Calculator?
Estimate study duration from a recruitment target, recruitment rate and follow-up period. ITS Research Solution keeps the interactive tool above the explanation so you can calculate first and then review the method used.
Formula or method
Recruitment weeks = target sample / participants recruited per week; total duration adds follow-up.
How to use this tool
Enter the requested values using consistent units, run the calculation and review the main result plus any supporting values. Recruiting 200 participants at 10 per week requires about 20 recruitment weeks before added follow-up.
Interpretation and limitations
Real timelines should include startup, ethics, holidays, site activation and contingency time. Always check source data, units, rounding and discipline-specific requirements before using a result in assessed, published, regulated or high-stakes work.
Frequently asked questions
How is this result calculated?
Recruitment weeks = target sample / participants recruited per week; total duration adds follow-up.
Can I use this result in formal academic or research work?
Use it as a transparent calculation aid, then verify the assumptions, units, rounding and any institution-, journal- or field-specific requirements before formal use.