Sample Size Calculator
Calculate the required sample size for surveys, experiments, or studies. Use this Sample Size Calculator to get accurate results quickly online.
experiment sample size calculator
A Sample Size Calculator enables one to estimate the number of people, or samples, needed to conduct surveys, experiments, or research easily. Users have the ability to obtain the smallest possible sample size in order to have reliable and statistically significant results by putting in the population size, confidence level, and margin of error.
statistical sample size calculator
The Sample Size Calculator is an online resource that assists a researcher, a student, or an analyst with the calculation of the sample size necessary in a survey, experiment, or study. The calculator uses data (population size, confidence level required, and desired margin of error) to calculate the least required sample size to ensure accurate and statistically significant results. This is a reliable tool that saves time, and under- or over-sampling is avoided. The user interface is intuitive, rapid, and does not require any installation.
Work, Installation, Input to Output
Work:
- Accepts population size (optional for infinite populations).
- Accepts confidence level (e.g., 90%, 95%, 99%).
- Accepts margin of error (e.g., ±5%).
- Calculates minimum required sample size using standard statistical formulas.
Installation:No installation required; works in any modern web browser.
Input:
- Population size (N)
- Confidence level (%)
- Margin of error (%)
Output:
- Required sample size (n)
Testing and Final Adjustments
Test on finite and infinite population size. Check the results of the standard confidence levels (90, 95, and 99) and standard margins of error (1-10 percent). Make sure that the handling of the decimal and integer rounding is done well. Test mobile and desktop responsiveness. Offer real-time updates with the modification of inputs. Add validation of invalid data (non-numeric negative and zero values). Presentation of clear results and provision of assumptions based on which the results were calculated (e.g., the population is finite/infinite). Compare findings with standard statistical tables or formulae. Make sure that it is usable by students, researchers, analysts, and survey planners. Maximize UI in terms of clarity, speed, and accuracy. Add messages for impossible or invalid input combinations.
Frequently Asked Questions - Sample Size Calculator:
What is a Sample Size Calculator?
A tool to calculate the minimum number of samples required for surveys, experiments, or studies.
How do I use it?
Enter population size, confidence level, and margin of error to get the required sample size.
Can it handle infinite populations?
Yes, leaving population size empty will assume an infinite population.
What confidence levels are supported?
Common confidence levels such as 90%, 95%, and 99% are supported.
Can it handle different margins of error?
Yes, you can enter any margin of error as a percentage.
Is it free?
Yes, the Sample Size Calculator is completely free online.
Can I use it on mobile devices?
Yes, it is fully responsive and works on all devices.
Why is sample size important?
It ensures your survey or study results are statistically reliable and significant.
What happens if I enter invalid input?
The calculator will show an error message for invalid or missing input.
Who can use this tool?
Researchers, students, survey planners, analysts, and anyone conducting studies.
