Net Promoter Score (NPS): What It Is, How to Calculate It, and How to Improve It

If you've ever answered the question "How likely are you to recommend our company to a friend or colleague?", you've already participated in a Net Promoter Score survey. This seemingly simple metric has become one of the most widely used indicators for companies around the world to measure customer satisfaction and loyalty.

But NPS goes far beyond a single number. When used correctly, it's a strategic tool that helps you anticipate churn, identify improvement opportunities, and build a customer-centric culture. In this comprehensive guide, we'll walk you through everything you need to know.

What Is Net Promoter Score (NPS)?

Net Promoter Score is a customer loyalty metric developed by Fred Reichheld, Bain & Company, and Satmetrix in 2003. It's based on a single question:

"On a scale from 0 to 10, how likely are you to recommend [company/product/service] to a friend or colleague?"

Based on the responses, customers are classified into three groups:

• Promoters (9-10): Enthusiastic customers who buy frequently and actively recommend your brand. They're the engine of your organic growth.
• Passives (7-8): Satisfied but not enthusiastic customers. They're vulnerable to competitor offers and don't generate active recommendations.
• Detractors (0-6): Dissatisfied customers who can damage your brand with negative opinions and hinder growth.

How Is NPS Calculated?

The NPS formula is straightforward:

NPS = % Promoters - % Detractors

The result is a number ranging from -100 (everyone is a detractor) to +100 (everyone is a promoter).

Practical Calculation Example

Imagine you survey 200 customers and get the following results:

Group	Responses	Percentage
Promoters (9-10)	120	60%
Passives (7-8)	50	25%
Detractors (0-6)	30	15%

NPS = 60% - 15% = 45

An NPS of 45 is considered excellent in most industries.

What Is a Good NPS? Benchmarks by Industry

Not all industries start from the same baseline. What constitutes a good NPS varies significantly by sector:

Industry	Average NPS	Excellent NPS
SaaS / Software	30-40	>50
E-commerce	35-45	>60
Banking & Finance	20-35	>50
Telecommunications	10-25	>40
Insurance	15-30	>45
Healthcare	25-40	>55
Retail	30-45	>55
Consulting	40-55	>65

As a general rule:

• Below 0: There are serious issues to address.
• 0-30: Acceptable, but with significant room for improvement.
• 30-50: Good. Your company generates more promoters than detractors.
• 50-70: Excellent. Customers are loyal and actively recommend you.
• Above 70: World-class. Few companies achieve this consistently.

Types of NPS: Relational vs. Transactional

There are two main approaches to measuring NPS, each serving a different purpose:

Relational NPS

Sent periodically (quarterly or bi-annually) to measure the customer's overall perception of the brand. It's useful for detecting trends over time and comparing against industry benchmarks.

Transactional NPS

Sent immediately after a specific interaction: a purchase, a support call, a delivery. It helps identify specific friction points in the customer journey.

The ideal approach is to combine both. Relational NPS gives you the big picture; transactional NPS provides the actionable details.

How to Design an Effective NPS Survey

The NPS question is just the starting point. To get actionable insights, you need to complement it:

1. The Main Question

"On a scale from 0 to 10, how likely are you to recommend [company] to a friend or colleague?"

2. The Follow-Up Question (Essential)

"What is the main reason for your score?"

This open-ended question is where the real value of NPS lies. Without it, you have a number but no idea what to do with it.

3. Best Practices for the Survey

• Timing: Send the survey when the experience is fresh (24-48 hours after the interaction for transactional NPS).
• Channel: Use the customer's preferred channel (email, SMS, in-app).
• Frequency: Don't over-survey. One relational survey per quarter is enough.
• Brevity: Maximum 2-3 questions. More questions = fewer responses.
• Target response rate: Aim for a minimum of 20-30% for data to be representative.

How to Improve Your NPS: Practical Strategies

Measuring NPS without acting on it is a pointless exercise. Here are the most effective strategies for improving your score:

1. Close the Loop with Detractors

Contact detractors within the first 24-48 hours. The goal isn't to convince them to change their score, but to understand their frustration and offer a solution. Studies show that up to 70% of detractors who receive proper follow-up can become passives or promoters.

2. Identify Patterns in Open Feedback

Group open responses by theme. If multiple detractors mention "wait times" or "return process," you have a clear area for improvement. AI-powered text analysis tools can automate this categorization.

3. Empower Your Promoters

Promoters are your most valuable asset. Make it easy for them to recommend you:

• Referral programs with incentives.
• Easy access to leave reviews on Google, Trustpilot, or social media.
• Early access to new products or features.

4. Convert Passives into Promoters

Passives are the group with the highest conversion potential. Effective strategies include:

• Personalized experiences.
• Tiered loyalty programs.
• Proactive communication about relevant updates.

5. Integrate NPS into Your Company Culture

NPS shouldn't just be a marketing team metric. Share results across all departments, set NPS goals by team, and celebrate improvements.

NPS and Its Relationship with Other Key Metrics

NPS doesn't exist in a vacuum. Its true power emerges when combined with other metrics:

Metric	Relationship with NPS	Combined Use
Churn Rate	Inverse. Higher NPS = lower churn	Predict churn by segmenting detractors
CSAT	Complementary. CSAT measures point-in-time satisfaction	NPS for loyalty, CSAT for interactions
CES (Customer Effort Score)	Complementary. CES measures ease of use	Low CES usually correlates with high NPS
CLV (Customer Lifetime Value)	Direct. Promoters have higher CLV	Prioritize retention of high-CLV promoters
Revenue	Direct. Companies with high NPS grow faster	Link NPS improvements to revenue impact

To dive deeper into how churn and retention relate to NPS, check out our churn rate guide and our customer retention guide.

Common Mistakes When Working with NPS

Avoid these mistakes that can invalidate your data or limit the impact of NPS:

1. Measuring without acting. The number alone doesn't change anything. What matters is what you do with the feedback.
2. Only surveying satisfied customers. If your sample is biased, your NPS doesn't reflect reality.
3. Ignoring the open-ended question. The "why" is more valuable than the number.
4. Obsessing over the absolute number. What matters is the trend and the speed of improvement.
5. Not segmenting. A global NPS hides differences across products, segments, or geographies.
6. Manipulating the result. Asking customers to give a 9 or 10 destroys the metric's credibility.

Tools for Measuring NPS

There are multiple platforms that make NPS implementation and analysis easier:

• Delighted: Simple, quick to implement, great for getting started.
• Hotjar: Integrates NPS with heatmaps and session recordings.
• SurveyMonkey: Flexible with strong analytical capabilities.
• Qualtrics: For companies that need advanced analysis and deep segmentation.
• Typeform: Exceptional survey user experience.

Case Study: From NPS 25 to NPS 55

An e-commerce company with an NPS of 25 implemented the following actions over 12 months:

1. Months 1-3: Established a detractor loop-closing system (response within <24h).
2. Months 3-6: Identified that 40% of complaints were concentrated around shipping times. Negotiated with a new logistics provider.
3. Months 6-9: Launched a referral program for promoters, generating 15% more recommendations.
4. Months 9-12: Integrated NPS feedback into the product roadmap, prioritizing the 3 most requested features.

Result: NPS of 55, 18% churn reduction, and 22% CLV increase.

NPS FAQ

How many responses do I need for my NPS to be reliable?

At a minimum, you need between 100 and 200 responses for an acceptable margin of error. To segment by product or region, you'll need more. A response rate of 25-30% is a good target.

How often should I measure NPS?

For relational NPS, once per quarter is standard. For transactional NPS, after each key interaction. Avoid surveying the same customer more than once every 90 days to prevent survey fatigue.

Does NPS work the same in B2B as in B2C?

Yes, but with nuances. In B2B, it's important to survey different roles within the same account (decision-maker, end user, administrator). B2B NPS scores tend to be higher because relationships are more personal.

Can I compare my NPS with my competitors'?

You can use industry benchmarks as a reference, but direct comparisons are difficult because each company measures at different times and with different methodologies. The most useful comparison is tracking your own NPS against your historical performance.

Conclusion

Net Promoter Score is much more than a satisfaction metric. It's a management system that, when properly implemented, helps you understand your customers, reduce churn, and accelerate organic growth. The key isn't the number itself, but what you do with it.

If you want to improve your customer experience and optimize your conversion rates with data, at Boost we help you with evidence-based CRO strategies. Learn more on our CRO services page or analyze your website for free with Scan&Boost.

— Adrià Vidal, Boost