Sample size calculator

This calculator computes the minimum number of necessary samples to meet the desired statistical constraints.

Sample size is a term used in market research to define the number of subjects included in a survey, study, or experiment.

Sample Size Calculator - SurveyMonkey

Use our accurate sample size calculation tool and learn how sample size works. Looking for more? Explore features and survey templates designed to get you ...

Sample Size Calculator by Raosoft, Inc.

This calculation is based on the Normal distribution, and assumes you have more than about 30 samples.

Sample Size Calculator - ClinCalc

Calculator to determine the minimum number of subjects to enroll in a study for adequate power.

Sample Size Calculator - Australian Bureau of Statistics

Sample Size Calculator · Select the Confidence Level you want to work at. · If you are sampling from a finite population (one that isn't very ...

Sample size calculator - CheckMarket

Sample size calculator. Determine the number of respondents needed in a survey to have statistically significant results. Or calculate the margin of error.

Sample Size Calculators

Statistical calculators, sample size, free, confidence interval, proportion, mean.

Sample size calculator - Optimizely

A/B test sample size calculator. Powered by Optimizely Experimentation's stats engine. Baseline Conversion Rate. Your control group's expected conversion rate.

Sample Size Calculator - Creative Research Systems

Use it to determine how many people you need to interview in order to get results that reflect the target population as precisely as needed.

Sample Size Calculator (Evan's Awesome A/B Tools) - Evan Miller

Visual, interactive sample size calculator ideal for planning online experiments and A/B tests.

Sample size calculator - Statistics Kingdom

Calculates the sample size for a survey (proportion) or calculates the sample size for a normal confidence interval.

Methodology | Sample Size Calculator - IndiKit

To calculate the required sample size, take advantage of IndiKit's Sample Size Calculator. Confidence Level: 95% Margin of Error: Population: Clear

Sample Size Calculator - SmartSurvey

We've provided an automatic calculator for this, but as any good researcher and student knows, it's important to show your working.

Sample Size Calculator for Estimating a Single Proportion - Statulator

A free on-line calculator that estimates sample sizes for a proportion, interprets the results and creates visualizations and tables for assessing the ...

A/B Test Sample Size Calculator - AB Tasty

Figure out how big your A/B test sample size needs to be with our A/B test calculator. No Mathematics PhD required.

Sample Size Calculator - Jotform

With Jotform's sample size calculator, you can easily determine a sample group and base your surveys on population size, confidence level, and margin of error.

Web-based Sample Size/Power Calculations

This page contains links to JavaScript based forms for simple power/sample size calculations. An extensive list of alternative and more comprehensive resources ...

Sample Size - Population Proportion - Select Statistical Consultants

Use this calculator to determine the appropriate sample size for estimating the proportion of your population that possesses a particular property.

OpenEpi:Sample Size for X-Sectional,Cohort,and Clinical Trials

Calculator. Counts. Std.Mort.Ratio · Proportion · Two by Two Table · Dose-Response · R ... This module calculates sample size for unmatched cross-sectional and ...