Calculations Assumptions
WhatsApp Impact Calculator - Methodology Overview
Revenue Model
- Annual revenue per subscriber: £36 (£3 per month)
- Average active time in Year 1: 6.5 months per subscriber
- Subscribers are assumed to be acquired evenly throughout the 12 months
- Each monthly cohort generates revenue only for the remaining months in Year 1
Monthly Ramp Calculation
The 6.5-month average is calculated as follows:
- January subscribers are active for 12 months
- February subscribers are active for 11 months
- March subscribers are active for 10 months
- ... and so on
- December subscribers are active for 1 month
Average = (12 + 11 + 10 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1) ÷ 12 = 6.5 months
Revenue Formula
- Year 1 Revenue = Total Subscribers × (£36 ÷ 12) × 6.5
- Year 1 Revenue = Total Subscribers × £3 × 6.5
- Year 1 Revenue = Total Subscribers × £19.50
Channel
Conversion Rate
Notes
Online Sessions
0.5% monthly
Compounds to ~6% annually
SMS Subscribers
6%
One-time conversion
Email Subscribers
0.3%
One-time conversion
Social Followers
0.4%
One-time conversion
Store Walkthroughs
0.5%
QR code scan conversions
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