What is the Sample Allocation Calculator?
Split a total sample between two study groups using a chosen allocation ratio. ITS Research Solution keeps the interactive tool above the explanation so you can calculate first and then review the method used.
Formula or method
Group A = N×rA/(rA+rB); Group B receives the remainder.
How to use this tool
Enter the requested values using consistent units, run the calculation and review the main result plus any supporting values. A total sample of 300 with a 2:1 ratio allocates approximately 200 and 100 participants.
Interpretation and limitations
Final integer allocation is rounded while preserving the requested total sample. 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?
Group A = Nu00d7rA/(rA+rB); Group B receives the remainder.
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.