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Market Research Sample Size Calculator

Estimate how many completed survey responses you may need for your market research project and understand what that number means for confidence, reliability and decision-making.

Designed for marketing teams, product teams, agencies, SMEs, charities and public sector organisations planning quantitative research projects.

Trusted by brands, agencies and public sector teams across multiple industries.

B2B & B2C

Surveys

NOTE: This calculator is designed for quantitative research projects such as surveys and statistically-based studies. It is not intended for focus groups, depth interviews or other qualitative research methods.

Respondent 

Recruitment

Customer

Research

Public Sector

Research

2. YOUR RESULTS

Recommended completed responses

Awaiting Inputs

This is the sample size you should aim for.

Why doesn’t this increase much for large audiences?

Once your audience is large, the number of completed responses needed levels off. That’s because the calculator is estimating how many responses are needed for reliable results, not a fixed percentage of your audience.

 

For example, at a 95% confidence level and 5% margin of error, you usually need around 385 completed responses whether your audience is 100,000 people or 1 million people.

Estimated invitations needed

Awaiting Inputs

AWAITING INPUTS

What this means

AWAITING INPUTS

1. RESEARCH INPUTS

Population Size

Example: 1,000,000

  • This is the total number of people in the group you want to learn from.

    For example:

    • all customers in your database

    • all staff in your company

    • all people living in a town

    • all users of a product

     

    If you are researching 10,000 customers, your population size is 10,000.

Confidence Level (%)

  • This shows how sure you want to be that your results reflect the full group, not just the people who answered.

     

    Think of it like this:

     

    Higher confidence = more certainty

     

    Most organisations use a 95% confidence level because it provides strong, reliable results without requiring unnecessarily large sample sizes.

Margin of Error (± %)

  • This is how much your results are allowed to be “off” by.

     

    Example:

     

    If 60% of people say they like your product, and your margin of error is ±5%, the true result could realistically be between 55% and 65%.

     

    Smaller margin of error = more accurate results

     

    Most commercial market research projects use a ±5% margin of error.

Estimated Response Rate (%)

  • This is your best guess for how many people will actually reply.

     

    Not everyone you contact will respond.

     

    Example:

     

    If you invite 1,000 people and 100 complete the survey, your response rate is 10%.

     

    This helps estimate how many people you may need to contact to reach your target sample size.

Need help with your project?

MRFGR can help you design the survey, recruit the right participants and interpret the results.

What does your sample size actually mean?

Invitations needed

The estimated invitations figure helps you understand how many people you may need to contact to achieve your target sample size.

The sample size estimate helps answer a practical question: do you have enough completed responses to make a reliable decision?

It gives you a statistical benchmark, but it does not guarantee useful insight on its own. The quality of the questionnaire, how the audience is recruited, how representative the sample is and how the results are interpreted all matter.

Enough responses

The completed sample shows how many usable survey responses you should aim for.

Reliability depends on fit

A well-targeted sample is often more valuable than a larger sample from the wrong audience.

Typical Sample Sizes

Use these figures as practical planning ranges. The right number depends on the audience, research objective, decision risk and how the results will be used.

Research needed

Quick directional customer survey

Brand, product or concept testing

Robust consumer survey

B2B decision-maker surveys

Niche or hard-to-reach audience

Public sector / stakeholder survey

Tracking or segmentation study

Focus group research

Depth interviews

Typical completed responses

100 - 250

200 - 500

400 - 1000

50 - 200

30 - 150

250 - 1,000+

500 - 2,000+

6 - 10 per group

10 - 30 individual interviews

Choosing the right approach

A larger sample is not always better. A smaller, well-targeted sample can be more useful than a large sample of the wrong people.

MRFGR can help you decide what level of robustness is appropriate for your project.

Define clear research objectives

Target the right audience

Use the best method for your goals

Analyse and act on the insight

Common Sample Size Mistakes

Assuming Bigger Is Always Better

A larger sample is not automatically better. A smaller, well-targeted sample can often provide more useful insight than a larger sample from the wrong audience.

Focusing Only On Sample Size

Sample size is important, but questionnaire design, audience targeting, participant recruitment and data analysis all play a major role in the quality of the final research.

Confusing Quantitative And Qualitative Research

Surveys, polls and statistically based studies use different sampling approaches to focus groups, depth interviews and other qualitative methods.

Ignoring Response Rates

Many organisations focus on the number of completed responses they need, but forget to estimate how many people must be invited to achieve that target.

Who is the calculator for?

Marketing & Brand Teams

Plan brand, customer, market, and campaign surveys with a clearer view of how many responses you may need.

SMEs & Business Owners

Understand how many customers or prospects to survey before making important business decisions.

Product & UX Teams

Check whether user feedback is strong enough to support product, feature or experience decisions.

Public Sector & Charities

Plan resident, stakeholder, service-user or membership research with greater confidence.

Agencies & Consultancies

Estimate research requirements for client proposals, campaign planning and insight-led projects.

Insights & Action

Will the findings help you move forward with confidence?

Fieldwork

Can you reach enough of the right people?

Research Design

What is the best way to gather reliable evidence?

Target Audience

Who do you need to hear from?

Objectives

What do you need to understand or decide?

A good survey needs more than the right number of responses. The strongest projects are planned from the research question through to final recommendations.

Sample size is only one part of reliable market research.

Market Research Sample Size Calculator FAQs

Below are answers to some of the most common questions about market research sample sizes, survey response requirements, confidence levels, margins of error and quantitative research planning.

  • A good sample size depends on the audience, research objective, confidence level and margin of error. For many general consumer surveys, around 300–500 completed responses can provide reliable results. More specialised studies may require fewer or more responses depending on the audience being researched.

  • The number of survey responses you need depends on your population size, desired confidence level and acceptable margin of error. This calculator estimates the number of completed responses needed for a quantitative research project.

  • 100 responses may be enough for early-stage, directional feedback, but it is often not enough for robust statistical reporting across a broad audience. However, it can be suitable for some niche or hard-to-reach B2B audiences where the total population is relatively small.

  • Most commercial market research projects use a 95% confidence level. This generally provides a strong balance between reliability, practicality and project cost. While 90% confidence may be suitable for more directional research, 99% confidence often requires significantly larger sample sizes.

  • A ±5% margin of error is commonly used in market research because it provides a practical balance between accuracy and sample size. Smaller margins of error, such as ±3%, require larger sample sizes, while larger margins may be suitable for more exploratory or directional research.

  • Population size has the greatest impact when the audience is relatively small. Once the population becomes large, the required number of completed responses levels off. This means that a survey of 100,000 people and a survey of 1 million people may require a similar sample size to achieve the same confidence level and margin of error.

  • No. This calculator is designed for quantitative research projects such as surveys and statistically based studies. Qualitative research methods, including focus groups, depth interviews and workshops, use different approaches to participant recruitment and sample sizing.

  • Response rate helps estimate how many people you may need to invite to achieve your target number of completed responses. For example, if you need 400 completed responses and expect a 20% response rate, you may need to invite approximately 2,000 people.

  • The population is the total group of people you want to understand. The sample is the smaller group of people who actually take part in the research. The goal is for the sample to accurately represent the wider population so that reliable conclusions can be drawn.

  • Not necessarily. A larger sample can improve statistical reliability, but a well-targeted sample is often more valuable than a larger sample from the wrong audience. Research quality depends on both sample size and participant relevance.

  • A statistically significant sample size is one that is large enough to provide reliable results at a chosen confidence level and margin of error. The exact number depends on the size of the audience being researched and the level of certainty required for decision-making.

  • B2B studies often use smaller sample sizes than consumer research because decision-makers can be harder to reach. Many B2B projects work successfully with sample sizes ranging from around 50 to 300 completed responses, depending on the audience, sector and research objectives.

  • Once a population reaches a certain size, the number of responses needed grows very slowly. For example, a population of 100,000 people and a population of 1 million people may require a similar sample size to achieve the same confidence level and margin of error.

  • Yes. This calculator can be used for employee surveys, customer surveys, public consultations, brand tracking studies and many other forms of quantitative research where statistical reliability is important.

  • There is no single answer because the required sample size depends on the size of your customer base and the level of accuracy required. Many customer satisfaction and customer experience surveys aim for between 200 and 1,000 completed responses, depending on the project objectives.

  • Most customer satisfaction surveys use a confidence level of 95% and a margin of error of ±5%. The required sample size will vary depending on the size of the customer population and the level of precision needed for reporting.

  • Brand awareness studies often use larger sample sizes than many other research projects because they are designed to measure awareness levels across broader audiences. Sample sizes commonly range from 400 to 2,000 completed responses depending on the market and reporting requirements.

  • Public consultation studies can vary significantly depending on the size of the population being consulted and the decisions being supported. Statistical sample size calculations can help estimate an appropriate number of responses for reliable reporting.

  • Employee engagement surveys typically aim to collect responses from as many employees as possible. Where a full census is not practical, a statistically reliable sample can be used to provide confidence in the findings.

  • Sample size is only one part of a successful research project. Questionnaire design, audience targeting, participant recruitment, fieldwork management, data analysis and reporting all play important roles. MRFGR can help design and deliver quantitative and qualitative research projects from start to finish.

Need help designing a reliable survey?

MRFGR helps organisations plan quantitative research projects from sample sizing and questionnaire design through to respondent recruitment, fieldwork, analysis and reporting.

Whether you are testing a product idea, measuring customer experience, researching a market or gathering stakeholder feedback, we can help you design the project properly from the start.

Testimonials

What our clients say

Heathrow-Express.avif

"Over the past year, we have had the pleasure of working with MRFGR on multiple projects, and we cannot recommend them highly enough. Their communication throughout our engagements has been excellent, always prompt and clear, which has greatly facilitated our processes. The team at MRFGR, although small, is exceptionally knowledgeable and dedicated. Their expertise is evident in their ability to obtain high sample sizes and deliver well-published results. What sets them apart is how easily their findings are translated into actionable insights, ensuring that we can swiftly and effectively utilise the data. Their speed of delivery is truly impressive. We consistently receive results in good time, which is crucial for our fast-paced operations. MRFGR has proven to be an invaluable partner, and their service has consistently exceeded our expectations. For anyone in need of reliable, efficient, and insightful research services, MRFGR comes highly recommended."

Mark

Heathrow Express

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"MRFGR have been absolutely brilliant! The videos we have received from their respondents have been perfect - they clearly brief their people really well and you can tell from the content we receive. They give clear communication & are on hand to help at all times. We give them some crazy tight timelines and they turn things around for us so quickly and without stress - even when the respondents are coming from multiple countries. I highly recommend Matthew & Paul - they're fab!"

Olivia

Confidential Client

nhs.avif

"When I phoned Matthew at MRFGR I was in a bit of a pickle. I needed to recruit 25 consultant paediatricians for telephone interviews (with minimal incentive) across 8 countries, two of which were non-English speaking. Oh, and I needed to have recruited and completed the interviews in 12 working days. Surprisingly, Matthew wasn't taken aback by this and set about the task with enthusiasm. Even against these challenging timescales, Matthew was able to deliver all 25 consultants - a phenomenal effort. I was extremely happy. And, more importantly, so was my client."

Sebastian

NHS

vodafone.avif

"MRFGR were not the cheapest firm who pitched for our work, but I am happy that I decided to go with them. I feel that their database is extensive and this combined with their excellent client service means that they offer a higher degree of reassurance and peace of mind than other recruitment agencies we have worked with in the past. When we had a problem to resolve at short notice they did this very quickly. I would happily work with them again."

Richard

Vodafone

sky.avif

"Hi Stephen Both groups went very well - a key client attended the first and was very pleased. Very articulate groups, really impressed especially considering it was such a difficult recruit (recruiting Somalis). The hotel was great too, incidentally, a nice place to do groups. Many thanks for your hard work on this - hope you feel it was worthwhile!"

Luke

Sky

Uni-Nottingham.avif

"MRFGR recruited four focus groups for our research across a variety of settings, including socio- economically deprived urban communities and very small rural communities. Despite the significant challenges these settings posed MRFGR ensured that all our focus groups were fully attended, and with a minimum of fuss. I would have no hesitation in recommending them for recruitment work."

Murray

Nottingham University

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"It's always a pleasure to work with MRFGR. They are a great partner who consistently recruit high calibre respondents to take part in our research projects and workshops. Always professional and very reliable."

Susanne

Nescafe

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"Our organisation, the Solicitors Regulation Authority, has used MRFGR to support our recruitment requirements for focus groups and public events and we have always found their service and achievements to be excellent. They have demonstrated a commitment to meet last-minute requirements in a calm and professional manner and we would not hesitate to recommend them."

Richard

Solicitors Regulation Authority

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"I would like to take this opportunity to express our appreciation for the work that you recently carried out for us. Stephen Essex and MRFGR were recommended to me by a colleague. It was important for us to find a company who could understand and deliver our brief on a very tight schedule. Stephen demonstrated a level of knowledge and professionalism that gave us the assurance that this would be achieved. The result was a report that clearly met the objectives of our brief, was presented in a professional manner, which then enabled us to present the findings to our customer with confidence. We would not hesitate to recommend or use Stephen again."

Amy

Febreze

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"The groups in Chipping Norton went really well thank you. We had a full turn out to both of them. I would just like to say that we have been very impressed with the number of participants you have managed to recruit to these groups, your regular updates on the recruitment progress, and your follow up contact. We have also had very positive feedback from the participants about their contact with you. We will definitely consider MRFGR in future when wishing to recruit participants to similar groups."

Rachael

Countrywide

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"We have used MRFGR to recruit participants for multiple research projects with varied samples sizes and sometimes challenging recruitment criteria. They have a calm and professional manner, providing us with regular updates in the lead up to and on the day of research projects. Multiple touch points with participants approaching the study date ensures drop-out rates are extremely low with replacements usually being found very quickly if necessary. I look forward to working with MRFGR in the future."

Theo

e.on

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"MRFGR is the first external company we have used for sourcing focus group attendees. Although we have organised many groups previously I would definitely use MRFGR again. The costs were reasonable and the attendees we have received have been exactly the right target groups. The level of communication has been satisfactory too with regular updates leading up to each focus group. Matthew has managed all of the groups we have requested and there has been no issues. I would recommend trying MRFGR."

Doug

Confidential Client

Google

125+ Reviews

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