calculate margin of error
Sample Size:
100
200
300
400
500
600
800
1,000
2,000
Select the size of your desired sample (e.g., 400, 600, etc.).
Sample Proportion (%):
50%
70% (or 30%)
90% (or 10%)
Select the percentage of the total population who are expected to answer a certain way on the key measure in the survey.
Note: If you are unsure what the proportion might be, use 50% because this is the most conservative measure and produces the maximum possible variation.
Total Population:
Enter the total size of the population you are studying. If the total population you are studying is small or your sample makes up at least 5% of the entire population, entering the population here will reduce the margin error calculated. If you are unsure what amount to put here, leave it blank.
Confidence Interval:
80%
85%
90%
95%
96%
98%
99%
99.9%
Margin of Error »
Note: The calculator above assumes a population of at least 2,500 individuals. The margin of error is calculated differently for populations smaller than this. Contact Catalyst for more information.