Plan studies with greater confidence
Use practical calculators for sample size, margin of error, NPS, response rate, CSAT, and study planning. No account is required.
Sample size calculator
Estimate the minimum number of completed responses for a proportion estimate under a simple random sampling assumption.
Finite population correction: n = n₀ ÷ [1 + (n₀ − 1) ÷ N]
Margin of error calculator
Estimate the precision of a percentage based on sample size, population, confidence level, and assumed distribution.
NPS calculator
Enter respondent counts for promoters (9–10), passives (7–8), and detractors (0–6).
Range: −100 to +100
Net Promoter, NPS, and Net Promoter Score are trademarks of their respective owners. Use according to applicable licensing and brand guidance.
Response and completion rate
Measure invitations, delivery, starts, and completed responses across a collector.
CSAT calculator
For a five-point scale, CSAT commonly counts “satisfied” and “very satisfied” as positive responses.
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.
Define the population
Clarify who is eligible, how they can be reached, and whether every eligible member has a known chance of selection.
Plan for nonresponse
Estimate the invitation volume required to achieve completed responses and monitor bias across important groups.
Protect participants
Use appropriate consent, confidentiality, retention, access, and institutional review procedures for the study context.
Put your research plan into action
Create a survey from a research template, apply the recommended sample, monitor response quality, and export analysis-ready data.
Go beyond single-number calculators
Sampling Studio
Stratified, cluster, multistage, PPS, quota, panel, design effects, and recruitment planning.
Weighting Studio
Base weights, nonresponse, post-stratification, raking, calibration, and trimming.
Quality Studio
Paradata, response integrity, interviewer monitoring, corrections, and prelaunch quality scores.