Invites needed calculator
How many people to invite to get the desired number of responses
Invites needed — number of people to invite to reach a target number of responses, given an expected response rate.
Parameters
How many completed responses you need
What percentage of invited will complete the survey
Extra margin in case response is lower
Assumptions and limitations
- Email to customer base: 10–30%
- Cold outreach: 2–10%
- Online panels: 15–40%
- Site pop-up: 5–15%
Invites needed
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Enter data
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Invites at different response rates
Target (responses)
RR 10%
RR 20%
RR 30%
100
1 000
500
334
300
3 000
1 500
1 000
500
5 000
2 500
1 667
* No buffer; add 10–20% to invites for margin
Frequently asked questions
How to estimate expected response rate?
Why use a buffer?
What affects response rate?
How to improve response rate?
Is there a difference between invited and unique visitors?
How many reminders to send?
What formula is used for number of invites?
Is this calculator related to response rate?
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In SurveyNinja, NPS, CSAT and more are calculated automatically. Create a survey in 5 minutes and get real-time analytics.
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