Tools for
Quantitative Researchers
Free calculators that run entirely in your browser. No sign-up, no data uploaded, no cost.
Sample Size Calculator
G*Power / Multiple Regression method
Krejcie & Morgan Table
Enter your population, get the required n
Taro Yamane Formula
n = N/(1+Ne²) with a selectable margin of error
Mean & S.D. Calculator
Auto-interpret Likert Scale results
Cronbach's Alpha
Test your questionnaire reliability
IOC Calculator
Content validity from expert ratings
Thesis Template
Free Chapter 1-5 structure for Master's
Research Methodology (7 steps)
Reference guide for the full research process
Note: the sample size calculator is available in English. The remaining calculators currently have Thai interfaces — the inputs are numeric and the results are standard statistics, so they remain usable, and English versions are in progress.
Guides in English
Taro Yamane vs Krejcie & Morgan vs Cochran vs G*Power
Which sample-size method to use, and when each one is the defensible choice.
Why Cronbach's Alpha matters in survey research
What the coefficient actually measures and the thresholds reviewers expect.
How to calculate Mean & S.D. for Likert-scale data
Descriptive statistics for Chapter 4, with Best's (1977) interpretation ranges.
Still stuck on
data collection?
These tools tell you how many responses you need. We get you the real respondents.