Calculate Your WhatsApp
Impact

1. Step 1

   Add your audience data

   Enter the channel volumes you already track. The calculation runs instantly in your browser.

2. Step 2

   See your potential

   Review expected subscribers, year-one revenue, channel mix, and the quarterly growth curve.

3. Step 3

   Share the result

   Download a board-ready PDF report with the inputs, assumptions, and headline forecast.

Online conversion

0.5% / mo

SMS conversion

6%

Revenue / campaign

£2.00

Welcome journey conversion*

20.00%

* Purchases within a month of joining, attributed to WhatsApp. Based on the default £50 average order value.

The calculator adds your existing WhatsApp audience to the new subscribers forecast from each channel. Every subscriber receives 1 marketing campaign per month at £2.00 of revenue each, so existing subscribers contribute £2.00 per month for the full year; new subscribers are acquired evenly, averaging 6.5 active months in year one and adding a one-off welcome journey modelled at 20.00% conversion at the default £50 average order value.

• “Merx’s AI-enabled platform gave us a smarter way to engage. It’s helped us personalise at scale, collect real insight, and rebuild our CRM with people who actually convert.”

  Molly Ratcliff

  CRM Manager · Benefit UK

• “Merx has given us a scalable, two-way channel to provide our customers with the guidance and support they need. It’s helping us build trust while driving meaningful revenue.”

  Francesca Gambrell

  General Manager · Zita West

• “Our WhatsApp campaigns consistently deliver the highest ROIs across our marketing channels. It’s become an essential part of our toolkit especially as the team at Merx are extremely knowledgeable and helpful.”

  Arjun Koyappalli

  General Manager · Napiers

Frequently asked questions

How is the WhatsApp subscriber forecast calculated?

The calculator applies a fixed conversion rate to each channel: 0.5% per month for online sessions, 6% for SMS subscribers, 0.3% for email subscribers, 0.4% for social followers, and 0.5% for in-store QR scans. The five contributions are added to your existing WhatsApp subscriber base.

How is expected revenue calculated?

The model assumes £2.00 of revenue per marketing campaign and 1 campaign per subscriber per month, so each subscriber generates £2.00 per month or £24 across a full year. Every new subscriber also enters a one-off welcome journey in the month they join, modelled at 20.00% conversion based on a £50 average order value. Existing subscribers contribute campaign revenue for all 12 months, while new subscribers are acquired evenly, average 6.5 active months, and are worth £23.00 in year one.

Why does the calculator show a range?

The estimated new-subscriber contribution is displayed as a plus-or-minus 5% range, while the existing subscriber baseline remains fixed. This communicates that the acquisition forecast is directional rather than guaranteed.

What does the quarterly growth chart show?

The chart starts with your existing WhatsApp subscriber base and spreads expected new subscribers evenly over twelve months. Each quarter shows the projected total subscriber base and cumulative revenue.

Where do the conversion rates come from?

The rates are Merx assumptions based on performance observed across existing retail and luxury customers. The complete channel rates and revenue model are listed on the calculation assumptions page and in the downloadable PDF report.

Is my input data uploaded?

The calculation runs in your browser. Your business metrics are sent to Merx only when you submit the lead form to download the PDF report, together with your contact details and a snapshot of the result so the team can provide relevant follow-up.

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