{"site":{"name":"Koji","description":"AI-native customer research platform that helps teams conduct, analyze, and synthesize customer interviews at scale.","url":"https://www.koji.so","contentTypes":["blog","documentation"],"lastUpdated":"2026-07-30T18:15:51.564Z"},"content":[{"type":"blog","id":"98df298e-3bef-4a3b-9729-10468b455885","slug":"survey-sample-cost-cpi-incidence-rate-2026","title":"How Much Does Survey Sample Cost in 2026? CPI, Incidence Rate & LOI Explained","url":"https://www.koji.so/blog/survey-sample-cost-cpi-incidence-rate-2026","summary":"Survey sample is priced per complete, driven by incidence rate (IR), length of interview (LOI), and audience specificity. In 2026 general population completes run $2-$15, screened studies $40-$80 per interview at n=250, and a 3% incidence executive study can hit $50 CPI versus $7 for a 70% incidence B2B study. Cost rises non-linearly below 20% IR. Buyers should confirm assumed IR and LOI, what counts as a complete, feasibility, and whether replacement completes are free — then run a 10% soft launch before full field. For questions about a company own customers (churn, onboarding, pricing), incidence is 100% and the screening premium disappears entirely.","content":"## The Short Answer\n\nSurvey sample is priced per **complete** — a finished, qualified response — and the price is driven by three variables: **incidence rate (IR)**, **length of interview (LOI)**, and how specific your audience is.\n\nIn 2026, online survey completes run roughly [$2–$15 each for general population work](https://www.driveresearch.com/market-research-company-blog/how-much-does-market-research-cost/), while a 250-respondent study with real screening criteria lands closer to [$40–$80 per interview](https://mx8labs.com/2026/05/07/what-market-research-actually-costs/). The spread is not vendor greed. A [B2B study at 70% incidence might carry a CPI of $7.00, while one targeting high-level executives at 3% incidence runs $50.00](https://www.driveresearch.com/market-research-company-blog/what-is-cpi-in-market-research-glossary/) — the same questionnaire, a 7x price difference.\n\nUnderstanding the formula is the difference between accepting a quote and negotiating one. And once you see it, an uncomfortable question follows: **you are paying most of that money to find the right people, not to learn anything from them.**\n\n---\n\n## The Three Variables That Set Your Price\n\n### 1. Incidence Rate (IR)\n\nIR is the percentage of people the provider contacts who actually qualify for your study. If you needleft-handed espresso drinkers who switched brands in the last 90 days, the provider may screen 20 people to find one. You pay for all 20.\n\nThis is why **cost rises non-linearly as IR falls**. The increases become [more pronounced once incidence drops below 20%](https://www.driveresearch.com/market-research-company-blog/what-is-cpi-in-market-research-glossary/). Roughly:\n\n| Incidence rate | Typical audience | Relative cost |\n|---|---|---|\n| 70%+ | General population, broad consumer | Baseline |\n| 30–50% | Category buyers, common job roles | 1.5–2x |\n| 10–20% | Specific software users, niche B2B | 3–5x |\n| Under 5% | C-suite, physicians, rare conditions | 8–15x |\n\n**The practical lever:** every additional screening criterion multiplies cost. Before adding one, ask whether it changes the decision you will make with the results. Our guide to [writing screener questions](/docs/research-screener-questions) covers how to qualify tightly without over-screening.\n\n### 2. Length of Interview (LOI)\n\nLonger surveys cost more per complete because respondents need larger incentives to finish them — and because drop-off rises with every minute. A 5-minute survey and a 25-minute survey are different products at different prices.\n\nLOI is also where cost and quality collide. Long instruments produce straightlining and speeding, so you pay more per complete *and* get worse data. If your survey has crept past 15 minutes, the fix is usually cutting questions, not raising the incentive.\n\n### 3. Audience Specificity\n\nBeyond the IR math, some audiences carry a structural premium because the panel supply is thin: physicians, IT decision-makers with budget authority, C-suite executives, owners of specific medical devices. [Honoraria for physicians alone run $3–$8 per minute](https://www.sermo.com/resources/a-complete-guide-to-paid-physician-surveys/), before the provider's margin.\n\n---\n\n## How to Read a Sample Quote\n\nA quote that says \"$12 CPI, n=400\" is incomplete. Ask for these five things in writing:\n\n1. **Assumed incidence rate.** Quotes are conditional. If actual IR comes in lower than assumed, the price gets revised mid-field — this is the single most common budget surprise in market research.\n2. **Assumed LOI**, and what happens if the questionnaire runs long in soft launch.\n3. **What counts as a complete** — and who pays for terminates, over-quota respondents, and completes you reject for quality.\n4. **Feasibility**: can they actually deliver n=400 in your target window, or will field time stretch?\n5. **Whether replacement completes are free** if you scrub responses for fraud or inattention.\n\nThe soft launch matters more than people expect. Field 10% of your sample first, check actual IR and LOI against the assumptions, and re-price before the full launch. Skipping it is how a $5,000 study becomes an $11,000 study.\n\n---\n\n## The Costs the CPI Doesn't Include\n\nCPI covers the respondent. It does not cover the work around them, which is usually the larger number:\n\n- **Questionnaire design** — and rework when soft launch reveals a broken screener\n- **Programming and testing**\n- **Data cleaning** — removing speeders, straightliners, and fraudulent completes, then buying replacements\n- **Analysis and reporting** — the dominant hidden cost, since a data table is not an insight\n- **Follow-up qualitative** — because when the survey says 40% are dissatisfied, you still do not know why, and that answer requires a second study\n\nOverall, most organizations spend [$5,000 to $75,000 on a single market research project in 2026](https://merren.io/blogs/how-much-does-market-research-cost/), and traditional in-depth interviews run [$500–$1,500 per conversation](https://mx8labs.com/2026/05/07/what-market-research-actually-costs/) once moderator prep, execution, and transcription are counted.\n\n---\n\n## The Question Worth Asking: Why Are You Buying Sample At All?\n\nSample pricing exists to solve one problem — **you do not have access to the people you need**. That is genuinely true for category-entry research, competitor customers, or general population norming.\n\nIt is often *not* true for the questions product and marketing teams actually ask. Churn drivers, onboarding friction, pricing sensitivity, feature demand, win/loss — the right respondents for those are already in your CRM, your product, and your support queue. For those studies, you are paying a 3–15x incidence premium to reach strangers who resemble your customers instead of talking to your customers.\n\n**This is where the cost model breaks in your favour.** With [Koji](https://www.koji.so), you interview your own users:\n\n- **AI-moderated voice and text interviews** run in parallel, around the clock — 40 interviews in the time one scheduled call takes.\n- **Incidence rate is 100%** when you invite your own customers. No screening premium, because you already know who they are — import them from CSV or [sync from your CRM](/docs/crm-research-integration-guide).\n- **Six structured question types** — open_ended, scale, single_choice, multiple_choice, ranking, yes_no — mean one study returns both the percentage and the reason behind it. No survey-then-interview double spend.\n- **Automatic thematic analysis** removes the analysis line item entirely.\n- **Published pricing**: €29/month for Insights, €79/month for Interviews, credits included. A text interview costs 1 credit, a voice interview 3. Only conversations scoring 3+ consume credits, so junk sessions do not bill you.\n\nCompare that to a 5% incidence study at $50 CPI: 100 completes is $5,000 in sample alone, before analysis. The same budget buys years of Koji — and produces conversations rather than crosstabs.\n\nWhen you *do* need external reach, [compare the recruitment platforms](/blog/participant-recruitment-platforms-2026) on IR handling and replacement policy, not headline CPI.\n\n**Start free at [koji.so](https://www.koji.so)** — from question to insight in hours, not weeks, with no research expertise required.\n\n---\n\n## Frequently Asked Questions\n\n**What does CPI mean in market research?**\nCPI is cost per interview or cost per complete — the price you pay for one finished, qualified response. It is calculated from the incidence rate, length of interview, and how hard your target audience is to reach.\n\n**How much does survey sample cost per respondent in 2026?**\nGeneral population online completes typically run $2–$15 each. Studies with real screening criteria land around $40–$80 per interview at n=250. Low-incidence audiences such as executives or physicians can reach $50+ CPI on their own.\n\n**What is a good incidence rate for a survey?**\nAbove 50% is comfortable and keeps costs near baseline. Between 20% and 50% is normal for targeted B2B or category research. Below 20% costs rise sharply, and below 5% you should expect an 8–15x premium over general population.\n\n**Why did my sample provider raise the price mid-field?**\nAlmost always because actual incidence rate or length of interview came in worse than the quote assumed. Run a soft launch with 10% of your sample to validate both before committing to full field.\n\n**Does a longer survey cost more per complete?**\nYes. Longer instruments require larger incentives and suffer higher drop-off, so the per-complete price rises — and data quality falls through speeding and straightlining. Cutting questions is usually cheaper than raising incentives.\n\n**Can I avoid paying for sample entirely?**\nFor any question about your own customers — churn, onboarding, pricing, feature demand — yes. Interviewing your existing users has a 100% incidence rate and no screening premium. External sample is genuinely necessary for category entry, competitor customers, and general population benchmarks.","category":"Research","lastModified":"2026-07-27T06:13:27.127692+00:00","metaTitle":"Survey Sample Cost in 2026: CPI, Incidence Rate & LOI Explained","metaDescription":"How survey sample is priced: incidence rate, length of interview and audience specificity. Why a 3% IR study costs 7x a 70% one, and how to read a quote.","keywords":["survey sample cost","cost per complete","CPI market research","incidence rate","length of interview","market research sample pricing","how much does survey sample cost"],"aiSummary":"Survey sample is priced per complete, driven by incidence rate (IR), length of interview (LOI), and audience specificity. In 2026 general population completes run $2-$15, screened studies $40-$80 per interview at n=250, and a 3% incidence executive study can hit $50 CPI versus $7 for a 70% incidence B2B study. Cost rises non-linearly below 20% IR. Buyers should confirm assumed IR and LOI, what counts as a complete, feasibility, and whether replacement completes are free — then run a 10% soft launch before full field. For questions about a company own customers (churn, onboarding, pricing), incidence is 100% and the screening premium disappears entirely.","aiKeywords":["survey sample pricing","incidence rate","cost per complete","market research budget","participant recruitment"],"aiContentType":"guide","faqItems":[{"answer":"CPI is cost per interview or cost per complete — the price you pay for one finished, qualified response. It is calculated from the incidence rate, length of interview, and how hard your target audience is to reach.","question":"What does CPI mean in market research?"},{"answer":"General population online completes typically run $2-$15 each. Studies with real screening criteria land around $40-$80 per interview at n=250. Low-incidence audiences such as executives or physicians can reach $50+ CPI on their own.","question":"How much does survey sample cost per respondent in 2026?"},{"answer":"Above 50% is comfortable and keeps costs near baseline. Between 20% and 50% is normal for targeted B2B or category research. Below 20% costs rise sharply, and below 5% you should expect an 8-15x premium over general population.","question":"What is a good incidence rate for a survey?"},{"answer":"Almost always because actual incidence rate or length of interview came in worse than the quote assumed. Run a soft launch with 10% of your sample to validate both before committing to full field.","question":"Why did my sample provider raise the price mid-field?"},{"answer":"Yes. Longer instruments require larger incentives and suffer higher drop-off, so the per-complete price rises — and data quality falls through speeding and straightlining. Cutting questions is usually cheaper than raising incentives.","question":"Does a longer survey cost more per complete?"},{"answer":"For any question about your own customers — churn, onboarding, pricing, feature demand — yes. Interviewing your existing users has a 100% incidence rate and no screening premium. External sample is genuinely necessary for category entry, competitor customers, and general population benchmarks.","question":"Can I avoid paying for sample entirely?"}],"relatedTopics":["sample pricing","incidence rate","market research costs","participant recruitment","survey methodology"]}],"pagination":{"total":1,"returned":1,"offset":0}}