Define the population
Clarify who is eligible, how they can be reached, and whether every eligible member has a known chance of selection.
Free Tools
Free survey & research tools
Handy calculators to help you plan and analyze your surveys - no account required.
NPS Calculator
Calculate your Net Promoter Score from promoters, passives, and detractors.
Margin of Error Calculator
Instantly understand the accuracy of your survey data.
Sample Size Calculator
Quickly estimate the audience size you need for meaningful results.
Response Rate Calculator
Work out completion rate, start rate, and drop-off from your invitation numbers.
CSAT Calculator
Turn a 5-point satisfaction scale into a Customer Satisfaction Score.
AI Survey Generator
Describe what you want to learn and get a complete, ready-to-use survey in seconds.
Polls
Create quick single-question polls and see live results.
Use calculations responsibly
A calculator supports study planning - it does not replace methodology
These estimates assume simplified sampling conditions. Real-world accuracy can be affected by sampling frame coverage, nonresponse, weighting, clustering, design effects, measurement error, subgroup analysis, and data quality.
Plan for nonresponse
Estimate the invitation volume required to reach your completed-response target, and monitor bias across important subgroups.
Protect participants
Use appropriate consent, confidentiality, retention, access, and institutional review procedures for the study context.
Advanced research methods
Go beyond single-number calculators
Sampling Studio
Stratified, cluster, multistage, and quota sampling with design effects and recruitment planning.
Weighting Studio
Base weights, nonresponse adjustment, post-stratification, raking, calibration, and trimming.
Quality Studio
Paradata, response integrity, interviewer monitoring, corrections, and prelaunch quality scores.
Ready to put these insights to work?
Create a survey, poll, or NPS campaign in minutes and start collecting real responses.