Sample Size Calculator
Modify the values and click the calculate button to use
Find Out The Sample Size
This calculator computes the minimum number of necessary samples to meet the desired statistical constraints.
Use 50% if not sure
Leave blank if unlimited population size.
Find Out the Margin of Error
This calculator gives out the margin of error or confidence interval of observation or survey.
Leave blank if unlimited population size.
Sample Size Calculator - Determine Optimal Survey Sample Size
What is a Sample Size Calculator?
A Sample Size Calculator is a statistical tool that helps researchers, marketers, and data analysts determine the minimum number of respondents or observations needed in a survey or experiment to achieve reliable results. It ensures that your study is statistically significant while minimizing costs and effort.
Why Use a Sample Size Calculator?
- Accuracy: Ensures your survey results reflect the true population with minimal error.
- Cost-Efficiency: Avoids oversampling (wasting resources) or undersampling (inaccurate results).
- Statistical Confidence: Helps achieve desired confidence levels (e.g., 95% confidence).
- Margin of Error Control: Determines how closely your sample represents the population.
How It Works
- Select Confidence Level – How sure you want to be about your results (e.g., 95%).
- Set Margin of Error – The acceptable error range (e.g., ±5%).
- Population Proportion (if known) – Estimated percentage of the population with a given trait (default: 50% for maximum variability).
- Population Size (optional) – Total number of people in your target group (for finite populations).
Key Features
✅ Two Calculators in One:
- Find Sample Size – Determines how many responses you need.
- Find Margin of Error – Calculates the error range for a given sample size.
✅ Flexible Inputs:
- Adjustable confidence levels (70% to 99.999%).
- Customizable margin of error and population proportion.
✅ Real-Time Results:
- Instantly computes required sample size or margin of error.
- Provides clear interpretation of results.
Who Should Use This?
✔ Researchers – For academic and scientific studies.
✔ Marketers – To optimize survey responses for market research.
✔ Data Analysts – For A/B testing and statistical analysis.
✔ Businesses – To make data-driven decisions with confidence.
Get Started Now!
Use our Sample Size Calculator to ensure your surveys and experiments are statistically sound—saving time, money, and effort while maximising accuracy!