Sales & Leads

Sales funnel: what it is, what the stages are and how to build yours on WhatsApp

Quick answer

A sales funnel is the path a customer takes from first contact to purchase, divided into stages. It's called a funnel because fewer people are left at each stage: many ask, some request a proposal, few close. Building yours helps you see at which stage sales are stalling.

What CertuAI measured on the WhatsApp of 67 businesses

Across the 67 businesses that answer with CertuAI's AI, 32.5% of the 122,720 customer messages arrived outside Monday to Friday, 8 a.m. to 6 p.m. (July 30 to September 30, 2026). Half of the AI's replies went out within 11.7 seconds, and 9 in 10 within 20.7 seconds (38,908 replies). 34.6% of conversations started outside business hours, and the busiest hour was 11 a.m.

CertuAI WhatsApp Customer Service Index, Q3 2026: All businesses
What was measuredResultBase
Customer messages outside Monday to Friday, 8 a.m. to 6 p.m.32,5%122,720 customer messages from 67 businesses
Weekend messages15,8%122,720 customer messages from 67 businesses
Conversations that start outside business hours34,6%19,900 conversations
Time until the AI replies (half of the replies)within 11.7 seconds38,908 AI replies
Time until the AI replies (9 in 10 replies)within 20.7 seconds38,908 AI replies
Hour of the day with the most customer messages11h122,720 customer messages from 67 businesses

Source: CertuAI's customer service database, aggregated numbers only, no conversation read by a person; no imported history, no test contacts and without CertuAI's own sales chats. July 30 to September 30, 2026, measured on Oct 9, 2026. Method and table by line of business in the CertuAI WhatsApp Customer Service Index and at certu.com.br/dados.

Named customers, Jul 30 to Oct 10, 2026

CustomerCustomer messagesAI repliesConversations handledOutside business hoursAI replies in (median)Days with messages
JP Gás Água e Rações
gas and water distributor
42.83223.3516.47933,6%9,8 s70
CEMIP
medical clinic
12.4726.4842.43618,7%11,4 s37
Nikiti Auto Center
auto center
4.9123.54890019,5%14,4 s47
Imobiliária Rodrigues & Ribeiro
real estate agency
6.0902.75982333,2%18,4 s34
Alpha RH
human resources
3.0821.66672127,5%15,6 s52

Operating numbers from each account's dashboard, same yardstick as the Index, measured on Oct 11, 2026. Published with each owner's permission. Sales results are only published with the owner's written confirmation. Full list at certu.com.br/casos.

What CertuAI customers wrote

CertuAI brings together in one place features that would normally require several tools. Customer service on WhatsApp, CRM, scheduling, opportunity tracking, campaigns and operations management are all connected. Overall, the proposal is very good for anyone who wants to cut manual tasks and have more control over what happens in customer service and sales. [...]

Marcelo Vieira · Trustpilot, Oct 4, 2026 · 5 out of 5 · excerpt

Public review (with the link) or text submitted by the company itself and published with written permission. The rating only appears when the source has a rating.

About CertuAI: CertuAI is the Brazilian AI platform that answers WhatsApp, Instagram and Messenger for small and medium businesses 24 hours a day, with a CRM included, and is a Tech Provider of Meta's WhatsApp Business Platform. Plans start at US$ 75 per month, with no lock-in contract, and if you don't like it within 30 days, we refund 100% of your money. Create my agent

Want to see this working on your business's WhatsApp? Build your agent, no sign-up needed.

Summary in 7 facts

  • A sales funnel is the path a customer takes from first contact to purchase, divided into stages.
  • It's called a funnel because fewer people are left at each stage: many ask, some request a proposal, few close.
  • Building yours helps you see at which stage sales are stalling.
  • Want to see this working on your business's WhatsApp?
  • A sales funnel is the layout of the stages a customer goes through from first contact to purchase.
  • Each stage has a clear condition for the contact to move forward, and at each one some people drop off.
  • The classic split has three parts: top, middle and bottom.

What is a sales funnel?

A sales funnel is the layout of the stages a customer goes through from first contact to purchase. Each stage has a clear condition for the contact to move forward, and at each one some people drop off. That's why the shape is wide at the top and narrow at the bottom.

The funnel is not software or a closing technique. It's a way of organizing what already happens in your business, so you know how many contacts are at each point and what each one needs to move on.

What are the stages of a sales funnel?

The classic split has three parts: top, middle and bottom. They describe how much the person already knows about the problem and about you.

PartWhat the person is doingWhat you do
Top (discovery)Realizes they have a problem and starts researchingShows up where they search and answers the first question
Middle (consideration)Compares ways to solve it and asks for informationUnderstands the case, shows how you solve it and sends the proposal
Bottom (decision)Chooses who to buy fromRemoves the last objection, agrees on price and timing and closes

And what about the stages for a small business that sells on WhatsApp?

Day to day, top, middle and bottom become stages named after actions. A simple model that works for most businesses that serve customers by message:

  1. New contact. The person wrote for the first time.
  2. Qualified. You already know what they need and whether you can serve them.
  3. Proposal sent. The price or the quote went out.
  4. Negotiation. They replied to the proposal with a question, a request for a discount or a timeline.
  5. Closed. Won, when they paid or booked. Lost, when they said no or disappeared, with the reason noted.

How to build a sales funnel on WhatsApp, step by step

  1. Write down the stages that already exist. Look at your last sales and note what happened between the first hello and the payment. Don't copy another company's funnel.
  2. Define what moves a contact to the next stage. A fact you can check in the conversation: they sent the address, got the quote, asked for the payment link.
  3. Put every conversation in a stage. A contact that isn't in any stage is a forgotten contact.
  4. Give each contact a next step with a date. Someone who got a proposal on Monday and didn't reply gets a message on Wednesday.
  5. Note the reason for each lost sale. Price, timing, went quiet, bought somewhere else. Within a few weeks the most common reason shows up.
  6. Look at the numbers once a week. How many came in, how many moved on from each stage and how many closed.

How to calculate the conversion of each funnel stage?

Divide the number of contacts who moved past the stage by the number who entered it. Do this for each stage, always over the same period, for example a month.

A made-up example, just to show the math: one hundred new contacts came in, forty were qualified, twenty received a proposal and eight closed. From the first to the second stage, four in ten moved on. From the second to the third, half. From proposal to sale, four in ten again.

The number alone doesn't say much. What matters is comparing the stages with each other and with the previous month. The stage where the most people drop off is the first to fix, because that's where the same effort yields more sales.

Want to see how much money sits idle in unanswered messages? Run the numbers in the calculator.

What's the difference between a sales funnel and a marketing funnel?

The marketing funnel brings in the contact, and the sales funnel takes the contact to the purchase. Marketing handles ads, content and pages, and ends when the person reaches out or leaves a phone number. Sales starts at that first message.

In a small business, the same person usually runs both. It's still worth separating them on paper, to know whether the problem is a lack of new contacts or contacts who arrive and don't close.

What are the most common mistakes when building a sales funnel?

  • Too many stages. With eight or ten stages nobody updates them. Start with five.
  • A stage with no criteria. If two people on the team would put the same contact in different stages, the rule is vague.
  • A contact with no next step. A proposal sent with no follow-up date is the sale most often lost.
  • Not recording the lost sale. Without the reason, you don't know whether the problem is price, timing or slow replies.
  • A funnel only in your head. It works with ten contacts. With fifty open conversations, someone is left without a reply.

How does CertuAI help keep the sales funnel up to date?

In the CertuAI CRM, every conversation becomes a contact, a deal and a task on its own, and the deal already enters a stage of the funnel. The stages are yours: you change the names and the order to match how your business sells.

The automatic follow-up sends a message to people who stopped replying, and the AI answers on WhatsApp, Instagram and Messenger in the same inbox. See how it works on the CRM for WhatsApp page.

Read also

Frequently asked questions

What is a sales funnel?
It's the path a customer takes from first contact to purchase, divided into stages. At each stage, some contacts drop off, which is why the shape looks like a funnel.
What are the stages of a sales funnel?
The classic split is top (discovery), middle (consideration) and bottom (decision). In a small business, it usually becomes: new contact, qualified, proposal sent, negotiation and closed.
How to build a sales funnel on WhatsApp?
Write down the stages your sales already follow, define the fact that moves a contact to the next stage, put every conversation in a stage, give each contact a next step with a date and check the numbers every week.
What's the difference between a sales funnel and a marketing funnel?
The marketing funnel brings in the contact, with ads, content and pages. The sales funnel starts at the first message and goes through to the purchase.
How many stages should a sales funnel have?
For a small business, five are usually enough. With too many stages the team stops updating, and the funnel stops showing reality.

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In short

A sales funnel is the path a customer takes from first contact to purchase, divided into stages. It's called a funnel because fewer people are left at each stage: many ask, some request a proposal, few close. Building yours helps you see at which stage sales are stalling.

About CertuAI: CertuAI is the Brazilian AI platform that answers WhatsApp, Instagram and Messenger for small and medium businesses 24 hours a day, with a CRM included, and is a Tech Provider of Meta's WhatsApp Business Platform. Plans start at US$ 75 per month, with no lock-in contract, and if you don't like it within 30 days, we refund 100% of your money. Create my agent

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