Survey Response Rate Needed Calculator
Work out the response rate you need — or the number of invitations to send — to reach a target number of completed survey responses.
How it works
Response rate needed = target ÷ (contacts × eligibility) · Invitations = target ÷ (response rate × eligibility)
Two questions come up when planning fieldwork: given a fixed contact list, what response rate must you hit, and given an expected response rate, how many invitations must you send. This calculator answers both. The eligibility rate matters when a screener filters respondents — only qualified completes count toward your target, so a 50% screen-out doubles the raw responses you need.
Worked example
To collect 400 completes from a 5,000-person list where everyone qualifies: 400 ÷ 5,000 = 8% response rate needed. If you instead expect a 30% response rate, you would need to invite 400 ÷ 0.30 = 1,334 people.
Frequently asked questions
What counts as a good survey response rate?
It varies widely: internal employee surveys often reach 40–60%, customer email surveys 10–30%, and cold external panels can fall below 5%. Always plan with a conservative assumption and oversample.
Why include an eligibility rate?
Many surveys screen respondents — for example, only recent buyers qualify. If half of those who respond fail the screen, you must collect twice as many raw responses to reach your target of qualified completes.
Does a higher response rate always mean better data?
It reduces non-response bias risk but does not eliminate it. Who responds matters as much as how many — a 60% rate skewed toward satisfied customers can be worse than a representative 20% rate.
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This calculator is for educational purposes. Double-check important results before acting on them.