// multi-utility computation suite · offline · instant · precise
┌──────────────────────────┐
│ [c] calcalyst_ │
│ computation suite │
└──────────────────────────┘
// select a module to initialize
/ search↵ open firstesc close
// adsenseEMPTY_LEADER_SLOT728×90
// adsenseMOBILE_ANCHOR_SLOT320×50
// keyboard_shortcuts
/focus search
↑↓navigate module list
Enter
open first result from search
open highlighted
compute when module is open
compute when focused in a field
Escclose module · clear selection
⌫
math.sample-size-proportion Calculator
Calculates the minimum sample size for a proportion estimate from target confidence level, precision, and prior proportion estimate. Using a prior proportion of 0.5 is the conservative choice that maximises required sample size when the true proportion is unknown.
Inputs
Expected Proportion
Reference formula or conversion factor shown for context.
Margin Error Pct
The ± range around your estimate. Quadrupling the sample size roughly halves the margin of error.
Confidence Level Pct
How certain you want to be that the interval contains the true value. 95% is standard. Going to 99% widens the interval.
Results
required sample size n
Sample size or count used in the calculation.
z-score for confidence level
Number of standard deviations a value is from the mean. |z| below 2: within normal range. |z| above 2: in the outer 5% of the distribution. |z| above 3: in the outer 0.3%.
n = z²p(1-p)/E²
Sample size or count used in the calculation.
maximum n (p=0.5)
The largest value in the dataset or feasible range.