Statistics Tool
Sample Size Calculator
Calculate the number of subjects needed for a survey.
Calculate
Use 50% if unknown (this gives the maximum sample size).
How it works
This calculator uses the standard formula for sample size:
Where Z is the Z-score for the confidence level, p is the population proportion, and e is the margin of error. If a population size is provided, a finite population correction is applied.
n = (Z² * p * (1-p)) / e²Where Z is the Z-score for the confidence level, p is the population proportion, and e is the margin of error. If a population size is provided, a finite population correction is applied.
Frequently Asked Questions
Is Sample Size Calculator free to use?+
Yes, Sample Size Calculator on Matheric is completely free to use. We believe in accessible education and utility for everyone.
How accurate is Sample Size Calculator?+
We use standard mathematical formulas and high-precision computing algorithms to ensure results for Sample Size Calculator are accurate for academic and professional use.
Can I use Sample Size Calculator on my phone?+
Yes! Sample Size Calculator is fully responsive and optimized for all devices, including smartphones, tablets, and desktops.
Do you save my data?+
No. We prioritize your privacy. All calculations are performed in your browser or temporarily processed, and we do not store your personal input data.
How do I report a bug?+
If you notice any issues with Sample Size Calculator or have suggestions for improvement, please contact us via the link in the footer. We value your feedback!
Can I request a new feature?+
Absolutely. We are constantly expanding our toolset. Feel free to reach out with your requests, and we might build it next!