Net promoter score for small business: a plain guide

Net promoter score is one question with a number attached: how likely are you to recommend us to a friend? You ask it, you do some quick subtraction, and you get a score between -100 and +100. Big companies run it through expensive survey platforms and dashboards. A small business can run it with an email and a spreadsheet, and often gets more out of it, because you can pick up the phone and talk to the person who gave you a 3. This guide covers how to calculate it, what a good number looks like at your size, and the part most guides skip: what to do on Monday once the answers come in.

What net promoter score actually measures

The idea came from Fred Reichheld at Bain & Company in 2003. His bet was that one question about recommending you predicts loyalty better than a long satisfaction survey. You ask customers to answer on a scale from 0 to 10, and you sort them into three groups:

• Promoters (9 or 10). They like you enough to tell other people. These are the customers who send you referrals.
• Passives (7 or 8). Happy enough, but a cheaper or closer option could pull them away without much effort.
• Detractors (0 to 6). Something went wrong, or never went right. Some of them will leave, and some will say so in public.

Notice how harsh the scale is. A 6 sounds like a pass in school. Here it counts against you. That is on purpose. A customer who gives you a 6 is telling you they wouldn't stick their neck out for you.

How to calculate your net promoter score

The formula is short. Take the percentage of promoters and subtract the percentage of detractors. Passives count toward the total number of replies, but they don't add or take away anything on their own.

Here's a worked example. Say 40 customers answer your survey:

• 22 give you a 9 or 10. That's 55% promoters.
• 10 give you a 7 or 8. Those are passives.
• 8 give you a 0 to 6. That's 20% detractors.

55 minus 20 is 35. Your score is 35. It's written as a plain number, not a percentage, so you'd say "our NPS is 35," not "35%." Bain's own page on measuring the score walks through the same math if you want it from the source.

Watch out for small numbers

This is where small businesses get tripped up. With 40 replies, one person can move your net promoter score a lot. If just one of those 22 promoters had given you a 6 instead of a 9, you'd have 21 promoters (52.5%) and 9 detractors (22.5%). Your score drops from 35 to 30. One grumpy Tuesday, five points gone.

So don't panic over a single month's swing. Look at the trend across several rounds, and read the comments before you read the number.

What a good NPS looks like for a small business

Anything above zero means you have more fans than critics, which is a decent start. Scores in the 30s and 40s are healthy for most service businesses. Above 50 is strong. You'll see industry benchmark tables all over the web, and they're fine for a rough sense of scale, but they come from big companies with very different customers.

The better comparison is you, three months ago. If you were at 18 in spring and you're at 31 now, something you changed is working. Find out what it was and keep doing it.

How to run an NPS survey without special software

You don't need a survey platform to start. A form tool you already have and a short email are enough. Keep it to two questions:

1. The score question. "How likely are you to recommend us to a friend or colleague?" with a 0 to 10 scale.
2. The why question. "What's the main reason for your score?" Leave it as an open text box.

That second question is where the real value is. A number tells you how people feel. The comment tells you what to fix. If your form tool allows it, change the wording based on the score. A detractor could see "What's one thing we should do better?" while a promoter sees "What do you like most about working with us?"

A few practical habits that help:

• Time it well. Send it a week or two after a purchase or after a support ticket closes, while the experience is fresh.
• Don't over-ask. Surveying the same customer every month wears them out. Twice a year per customer is plenty for most small businesses.
• Send it from a person. "Hi, it's Maria from the shop" gets more replies than a no-reply address.

If you already ask customers for feedback in other ways, NPS fits alongside those. Our guide on how to collect customer feedback covers the other methods and when each one makes sense.

What to do with your NPS results

This is the part that separates a useful survey from a number you glance at and forget. Your net promoter score is a smoke alarm. The follow-up is putting the fire out.

Call or email every detractor

At small-business size you can reply to every single one, and you should, ideally within a couple of days. Thank them for being honest, ask one clarifying question, and tell them what you'll do. You won't win all of them back. You will win some, and the ones you don't will at least know someone read what they wrote. That matters more than people expect, and it ties straight into reducing customer churn.

The practical risk is that these follow-ups get lost in your personal inbox. One easy fix is to forward each detractor's comment to your support address, so it becomes a ticket with an owner and a status. In SupportifyGPT, any email sent to your support address turns into a ticket in the shared inbox, so nobody has to remember who promised to call whom.

Group the comments and look for repeats

Read every comment and tag it with a short label like "slow shipping," "hard to reach," or "price." After one round you'll usually see two or three themes that show up again and again. Those are your to-do list, in order.

If the same question keeps coming up, that's a sign customers can't find the answer on their own. Write it down as a help article. It's cheaper than answering it by hand forever.

Ask promoters for something small

Promoters just told you they'd recommend you. So make it easy. A quick "Thank you, would you mind leaving us a review?" with a direct link works well. So does a simple referral offer. Don't pester them, one ask is enough.

Nudge the passives

Passives are the quiet group that most businesses ignore. Their comments are often mild and specific, like "fine, but delivery took a while." Those small fixes are usually the cheapest way to move people from a 7 to a 9.

Where NPS fits with your other numbers

Net promoter score is about the whole relationship. It won't tell you whether your support team answered a ticket well yesterday. For that, a quick satisfaction rating after each conversation (CSAT) is the better tool. And first response time tells you whether people are waiting too long before anyone replies. Our list of customer service metrics that matter covers how these fit together without drowning in dashboards.

A simple setup for a small team: check NPS twice a year, CSAT every week, and response times every day. If NPS drops, the other two usually tell you why.

A simple NPS routine you can start this month

1. Pick 50 to 100 recent customers and send the two-question survey from a real person's name.
2. Give it a week, then calculate your net promoter score using the formula above.
3. Reply to every detractor within two days and track each one as a ticket so it gets closed.
4. Tag the comments, pick the top theme, and fix one thing.
5. Run it again in three to six months and compare against yourself.

That's it. No platform, no consultant. If you want a place where those follow-ups can't slip through the cracks, you can start a free trial and have a shared inbox running in a few minutes. Every feature is on every plan, starting at $15 a month. And for more ideas on growing a business people want to recommend, the rest of our small business blog has plenty.