Customer Metric - NPS

What is NPS?

Net Promoter Score (NPS) is a customer loyalty metric that measures how likely customers are to recommend your company, product, or service to others. It was introduced by Fred Reichheld in 2003 and has become one of the most widely used customer experience (CX) metrics.

Net Promoter Score

The core survey asks only one question:

"On a scale of 0 to 10, how likely are you to recommend us to a friend or colleague?"

It is usually followed by:

"What is the primary reason for your score?"

How is NPS calculated?

Customers are divided into three groups:

Score	Category	Meaning
9–10	😊 Promoters	Loyal customers who actively recommend you
7–8	😐 Passives	Satisfied but not enthusiastic
0–6	😞 Detractors	Unhappy customers who may discourage others

The formula is:

NPS = % Promoters − % Detractors

(Notice that Passives are included in the total number of responses but are not counted as either promoters or detractors.)

Example

Suppose 100 customers respond:

• 55 gave 9–10 → Promoters
• 25 gave 7–8 → Passives
• 20 gave 0–6 → Detractors

Then:

• % Promoters = 55%
• % Detractors = 20%

NPS = 55 − 20 = +35

The score always ranges from -100 to +100.

• +100 = Everyone is a promoter.
• 0 = Equal number of promoters and detractors.
• -100 = Everyone is a detractor.

Why is NPS special?

Unlike traditional satisfaction surveys, NPS measures customer advocacy, not just satisfaction.

1. Measures loyalty instead of satisfaction

A customer can be satisfied but still switch to another brand.

NPS asks:

"Would you recommend us?"

Recommendation requires trust and enthusiasm, making it a stronger indicator of loyalty.

2. Very simple

Only one mandatory question.

This leads to:

• Higher response rates
• Easier comparison over time
• Easier benchmarking across business units

3. Predicts business growth

Companies with more promoters than detractors generally experience:

• Higher customer retention
• More referrals
• Lower acquisition costs
• Stronger brand reputation

Although NPS is not a perfect predictor of growth, it is widely used as a leading indicator of customer loyalty.

4. Easy to benchmark

Since every company uses the same scale (-100 to +100), organizations can compare:

• Stores
• Countries
• Products
• Competitors
• Business units

5. Actionable

The follow-up "Why?" question helps identify:

• Product issues
• Service problems
• Pricing concerns
• Feature requests
• Customer expectations

How to interpret NPS

A commonly used guideline is:

• Below 0 - Poor
• 0–30 - Good
• 30–50 - Very Good
• 50–70 - Excellent
• Above 70 - World Class

Interpretation varies by industry, so benchmarking against peers is important.

Why not simply average the ratings?

Consider these two sets of responses:

Company A

10,10,10,10,10
Average = 10
NPS = 100

Company B

10,10,10,5,5
Average = 8
NPS = 20

The average score (8) hides the fact that 40% of customers are unhappy. NPS highlights this by emphasizing the balance between enthusiastic supporters and dissatisfied customers.

Strengths and limitations

Strengths	Limitations
Easy to understand	Doesn't explain why customers gave the score
Quick survey	Groups all scores 0–6 together, losing detail
Industry benchmark available	Should not be the only CX metric
Measures customer advocacy	Different industries have different benchmark ranges

NPS vs. CSAT vs. CES

Metric	Measures	Best For
NPS	Customer loyalty and willingness to recommend	Long-term relationship health
CSAT (Customer Satisfaction Score)	Satisfaction with a product, service, or interaction	Specific touchpoints
CES (Customer Effort Score)	How easy it was for the customer to complete a task	Support and service experience

Together, these three metrics provide a comprehensive view of the customer experience, with NPS serving as a high-level indicator of loyalty and advocacy.