How to Calculate Your Net Promoter Score

Table of Contents

What is Net Promoter Score?

Net Promoter Score (NPS) is the standard for measuring customer loyalty to brands, products, and services. NPS scores are calculated by asking customers a single question that generates a score between -100 and +100.

What is the Net Promoter Score question?

To measure your customer loyalty, you need to ask one simple question:

How likely are you to recommend [Organization/ Product/ Service] to a friend or colleague?

Usually, respondents will pick a score between 0 (Not at all likely) and 10 (Extremely likely) on a scale.

What Is The Net Promoter Score Question
Calculate your Net Promoter Score
Find your most loyal customers with KwikSurveys. Our NPS question type is included with your Free Trial.

NPS scale

Usually, the NPS scale requires respondents to select a rating between 0 and 10.

Fred Reichheld, who developed the NPS system, thought it necessary to have 11 points on the scale so respondents would not mistake 1 as the highest point.

However, some businesses also use 10 point and 5 point scales to determine their score. A study from MeasuringU on changing NPS scales found that:

  • Scores from the same respondent varied across different scales (although only a little)
  • 10 point scales reduced the number of detractors, increasing the overall score
  • 5 point scales reduced both detractors and promoters
  • Not using an 11 point scale risks losing external benchmarks, as it’s the industry standard.

The biggest takeaway from the study was to remain consistent with the number of points on your scale. I.e. don’t use a scale of 0 – 10 for one survey and then a 5 point scale for another.

How to calculate Net Promoter Score

NPS ratings are split into three categories: Promoters, Passives, and Detractors. The ratings associated with each category are based on the standard 11 point scale.

Before calculating your score, you must determine the percentage of customers for each category.

Detractors (those who select 0 – 6)

Detractors are unhappy customers who’ve had a bad experience with your organization at a touch-point. They’re the most likely to jump to a competitor or even impact your reputation through negative word of mouth.

Passives (those who select 7 – 8)

Passive customers are somewhat happy with your business but are not likely to recommend you to others. You shouldn’t be complacent with passives, they’re also likely to defer to a competitor if left unchecked.

Promoters (those who select 9 – 10)

These are the people most satisfied with your product or service. These are advocates for your organization, actively recommending you to friends and colleagues.

Net Promoter Score calculation

To calculate your net promoter score, subtract the percentage of Detractors from the percentage of Promoters. The number you’re left with is your NPS, it’s as simple as that.

The final score is not expressed as a percentage but as a number. Your score will range from -100 to +100.

Net Promoter Score Calculation

If you’d like to test this out for yourself, check out this NPS calculator.

How to calculate NPS on a 5 point scale

The calculation for a 1-5 NPS scale is the same as a 0-10 scale:

Promoters% – Detractors% = Net Promoter Score.

The only difference for 1-5 NPS scales is how respondents are categorized:

  • 0 = Detractors
  • 1 = Detractors
  • 2 = Detractors
  • 3= Detractors
  • 4 = Passives
  • 5 = Promoters

What is a good Net Promoter Score?

Any score above 0 is considered good, whilst any NPS score over +50 is considered excellent. Organizations that score over the +70 mark will be providing the best customer experience.

NPS calculated with KwikSurveys

Why should you calculate your Net Promoter Score?

Calculating your Net Promoter Score is essential to measuring customer loyalty. Here are six more reasons NPS will work for you:

1. It can be calculated with a single data point

Calculating this only requires a single question. Saving time for survey respondents (reducing the chance of survey fatigue) and for those analyzing the data.

2. Your score is a sign of business growth

If your customers are referring your product/service to friends and colleagues, they have entered the final stage of the customer journey; advocacy.

A high number of promoters (advocates) means you are providing the best customer experience. A low number means you need to do more to keep your customers happy.

3. Conducting an NPS survey is effortless

All you need to do is create a survey with a single question and you’re ready to start collecting results.

We do recommend you include a second question asking for open feedback on why respondents selected a particular rating, but this is up to you.

As long as the question is standardized for your organization, it can be used across all contact points. For example, at an event, as part of a website feedback form, or following a recent purchase.

4. NPS is malleable

You can calculate an NPS rating for any of your organization’s output. Whether it’s your overall brand, a product, or customer service. In this way, you can determine which aspects of your business need the most attention and where you’re already doing well.

5. Measure change over time

Conducting NPS research at regular intervals is paramount to improving customer relationships. We suggest you survey your customers around twice a year, to measure the impact of changes you make and identify seasonal discrepancies.

6. Benchmark against competitors

Average NPS scores vary from industry to industry. Performing some research into the average score for your industry can provide valuable context to your score. HubSpot has created a list of NPS Benchmarks by industry.

Disadvantages of Net Promoter Score

1. A single data source can be limiting

Without open-ended feedback to provide context, NPS scores can often be ambiguous. Because of this, it’s difficult to identify which area of your organization needs improving and where you’re already succeeding.

2. You need a large survey sample

The opinions of a few customers aren’t representative of the whole. Which segment of your audience, or what aspect of your business, your NPS survey concerns, can also affect what your score will be.

For example, if you calculate NPS for a product that’s doing well, your score will likely be high. But you can’t generalize these results, as they aren’t representative of customers who’re unhappy with other elements of your business.

3. Results don’t always lead to instant action

As mentioned above, collecting data from such a large audience can take time. The consequence of this is; any customers who’re unhappy at the time of rating will remain unhappy until action is taken.

4. NPS ratings don’t account for the influence of individuals

If a well-known CEO or celebrity is a detractor, the public opinion of them can influence the ratings given by customers.

5. Solicited feedback may create response bias

The time and manner of feedback requests may influence the way people respond. The best feedback is unsolicited, as it’ll likely be devoid of any bias created by the researchers. Learn more about response bias.

6. NPS score can be manipulated

Whether it is intentional or not, employees may only send NPS surveys to happy customers. This would lead to an artificially high NPS score.

Tips for improving NPS

1. Personalize NPS surveys

Improving customer relationships is the end goal of NPS. Addressing them by name will strengthen your relationship and encourage unbiased feedback.

2. Collect reviews regularly

Your score is not a one-off calculation, it’s a benchmark for development. Make a habit of collecting NPS at customer touch-points or through email campaigns.

3. Ask for open-ended customer feedback

By asking for additional comments, you’ll gain more insight into your strengths and weaknesses as an organization. However, don’t overload customers with open text boxes. The beauty of NPS is its usability and efficiency.

4. Open a dialogue

At the end of your survey, create a contact field for those customers who wish for you to contact them regarding their response. This creates another opportunity for relationship management and insight.

For a full perspective on your customer relationships, couple NPS with other forms of market and customer research. E.g. Customer Satisfaction Surveys (CSAT) and Customer Effort Score (CES).

This isn’t to say that conducting NPS isn’t a worthwhile pursuit. It is essential to identify those in the final stage of the customer buying journey (advocacy). But in compiling data from multiple feedback sources, you give more context to your NPS score.

Net Promoter, Net Promoter Score, Net Promoter System, NPS and the NPS-related emoticons are registered trademarks of Bain & Company, Inc., Fred Reichheld and Satmetrix Systems, Inc.

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