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Survey sample calculators
No email required. Work out sample size, incidence and estimated cost we send.
Each calculator shows its formula and rounds the way a field team would. Use them to sanity check a quote, ours or anyone else's.
Four calculators, no email required
Sample size calculator
Required n for a target margin of error and confidence level, with finite population correction.
"How many completes do I need?"Open calculatorMargin of error calculator
How much precision a given base size buys, for the total and for a subgroup, and what the figure assumes.
"Is n=150 enough for this cut?"Open calculatorIncidence rate calculator
Screener starts, screen outs and drop offs needed to reach your target completes.
"Why does low incidence cost more?"Open calculatorCost per complete estimator
How audience seniority, incidence and interview length move B2B CPI.
"What should B2B sample cost?"Open calculatorSurvey sample calculators: frequently asked questions
Are these calculators accurate for B2B survey research?
The sample size and margin of error calculators use the standard normal approximation with finite population correction, which is what any statistics reference uses. The incidence calculator is arithmetic. The cost per complete estimator is a market model, labeled as an estimate, and is not a Valid N rate card.
Can I link to or embed these calculators?
Yes. Link freely. If you want to embed one on your own site, contact us and we will send an iframe snippet with attribution.
Do you collect anything when I use them?
No. Every calculator runs in your browser. Nothing is sent to us.
Send the spec. Get real numbers back.
Audience, market, target n, expected interview length. Feasibility the same business day for standard audiences, with reachable counts, an estimated qualification rate we believe and a quoted cost per complete that stays fixed for the agreed brief.