Metric Definition
Incremental revenue from optional extras
Track from
Add-on revenue analysis
Add-on revenue analysis measures the total revenue generated from optional extras attached to subscription plans. It reveals which add-ons drive the most incremental value, how attach rates evolve over time, and whether your catalogue structure is converting upsell opportunities effectively.
5 min read
What is add-on revenue analysis?
Add-on revenue analysis examines the income generated from optional extras that subscribers purchase on top of their base plan. These extras might include additional seats, premium features, storage upgrades, or professional services bolted onto a core subscription.
Tracking add-on revenue separately from base plan revenue is important because add-ons are a primary lever for expansion revenue. They allow businesses to increase average revenue per user without requiring customers to change plan tiers. A healthy add-on programme generates 10 to 30% of total subscription revenue and grows faster than the base because it compounds on top of the subscriber base.
How to measure add-on revenue
Add-on Revenue Share = (Add-on Revenue / Total Subscription Revenue) x 100
For example, if a business generates 80,000 pounds in base plan revenue and 20,000 pounds from add-ons in a month, the add-on revenue share is 20%.
Complement this with attach rate, which measures the percentage of subscribers who have at least one add-on active. An attach rate below 15% typically suggests the add-on catalogue needs better positioning, bundling, or in-product prompts.
How to grow add-on revenue
- 1
Surface add-ons at the point of need
Trigger add-on suggestions when customers hit usage limits or attempt to access gated features. Contextual prompts convert far better than catalogue pages or email campaigns.
- 2
Bundle high-affinity add-ons into packages
Group add-ons that are commonly purchased together into discounted bundles. Bundles simplify the buying decision and increase average add-on spend per subscriber.
- 3
Retire underperforming add-ons
A long tail of low-adoption add-ons creates catalogue clutter and dilutes focus. Review attach rates quarterly and either reposition or retire add-ons below a minimum threshold.
Related metrics
Expansion Revenue
Growth from existing customers
SaaS MetricsMetric Definition
Expansion MRR = Sum of Additional MRR from Existing Customers (Upgrades + Add-ons + Seat Increases)
Expansion revenue is the additional recurring revenue generated from existing customers through upsells, cross-sells, add-ons, and usage growth. It is the most capital-efficient source of growth because it requires no acquisition cost.
Average Revenue Per User
ARPU
SaaS Metrics
Metric Definition
ARPU = Total Revenue / Number of Active Users
Average revenue per user (ARPU) measures the mean revenue generated per user or account over a given period. It is a critical metric for understanding monetisation efficiency and for connecting pricing strategy to revenue outcomes.
Plan Upgrade Rate
Tier migration frequency
SaaS MetricsMetric Definition
Plan Upgrade Rate = (Upgrades in Period / Active Subscribers at Start of Period) x 100
Plan upgrade rate measures the percentage of subscribers who move to a higher-value plan within a given period. It is a key indicator of product value realisation and expansion revenue potential, representing the most capital-efficient form of revenue growth because upgrades require no acquisition cost.
Link add-on revenue to your expansion picture
Build a metric tree that connects add-on revenue to ARPU, expansion MRR, and overall subscription revenue so you can see which extras drive the most incremental value.
