Math

Sample Size Calculator

385 responses give ±5% at 95% confidence. Get the survey sample size for any confidence level, margin of error and proportion, with small-population correction.

get/api/calc/sample-size-calculator

Request

  • Base URL: https://calcbright.com
  • URL: https://calcbright.com/api/calc/sample-size-calculator
  • Auth: none declared

Query parameters

conf'80' | '85' | '90' | '95' | '98' | '99' | '99.9'

Confidence level

marginnumber

Margin of error (±%)

pnumber

Expected proportion (%) Use 50% if unsure – it gives the largest, safest sample.

populationnumber

Population size Optional – leave blank for a large or unknown population.

Response

Calculation result

okboolean
toolstring
namestring
urlstring

Open this link to see the full calculation

inputsobject
summarystring

Plain-text answer

detailsstring
resultobject
errorsobject

Changes

No recorded changes to this operation across all 1 revision of this API.