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1. How to Determine your
Sample Size Using
Calmorin’s Formula
Thelma Villaflores

2. What is Calmorin’s
Formula?
1.

3. Calmorin’s formula is a tool proposed
by a Filipino researcher that computes
for the sampling size at 1% level of
probability and 99% reliability.

4. What is the
formula?
2.

5. Ss = NV + (Se)2 x (1-P)
NSe + (V)2 x P(1-P)
where
Ss = Sample size
N = Total number of population
V = The standard value (2.58) of 1 percent
level of probability with 0.99 reliability
Se= Sampling error
P = The largest possible proportion (0.50)

6. What is sampling
error?
3.

7. Sampling error is the probability that the
responses do not reflect the opinions of
the entire population.

8. How do you
compute for the
sample size?
4.

9. 1. Determine the total population to be
studied
2. Get the value of V, Se, and P
3. Compute for sample size using the
formula

10. Sample
Computation

11. 1. Determine the total population to be studied
N = 230
2. Get the value of V, Se, and P
V = 2.58
P = 0.50
Se= 0.01
3. Compute for sample size using the formula

12. Ss = NV + (Se)2 x (1-P)
NSe + (V)2 x P(1-P)
Ss = 230(2.58) + [(0.01)2 x (1-0.50)
230(0.01) + [(258)2 X ((0.50)(1-0.50))]
Ss = 593.40 + (0.0001 x 0.50)
2.3 + [(6.66) x (0.50 x 0.50)]

13. Ss = NV + (Se)2 x (1-P)
NSe + (V)2 x P(1-P)
Ss = 593.40 + 0.00005
2.3 + (6.66 x 0.25)
Ss = 593.40005
2.3 + 1.676

14. Ss = NV + (Se)2 x (1-P)
NSe + (V)2 x P(1-P)
Ss = 593.40005
3.96
Ss = 149.8 150

15. “The difference between something
good and something great is
attention to detail.”
Charles R. Swindoll
“

16. Calmorin, Laurentina P. (1994). Educational Research Measurement and
Evaluation. Second Edition Manila: National Bookstore.
https://www. freepik.com
https://www.nbrii.com/faqs/data-analysis/confidence-level-sampling-error-
2/#:~:text=Most%20researchers%20strive%20for%20a,opinions%20of%20th
e%20entire%20population.&text=Sampling%20error%20is%20the%20proba
bility,3%25%2C%20or%201%25
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