Value Metric
Date: 2026-09-27
The unit a subscription charges per — seats, usage, contacts, orders. Picked well, revenue grows automatically as customers get more out of the product; picked badly, the price punishes exactly the behaviour you want, or leaves the biggest customers paying the same as the smallest.
A value metric is the unit of consumption a recurring price scales with — the “per” in “£X per something”.
Common value metrics
| Value metric | Example shape | Scales with value when… | Breaks when… |
|---|---|---|---|
| Per seat | £12 per user per month | Each extra user gets their own value | Customers share logins, or value comes from one admin, not many users |
| Per usage | £0.002 per API call, per GB, per message sent | Consumption tracks value closely | Bills are unpredictable; customers ration use |
| Per outcome | % of revenue processed, per order fulfilled | Value is literally the outcome | Outcome is hard to measure or disputed |
| Per record | Per contact in an email list, per product in a catalogue | Bigger lists mean bigger businesses | You’re charging for dormant data they won’t delete |
| Flat | £49 per month, unlimited | Customers are similar in size | They aren’t — big customers are underpriced, small ones overpriced |
The test for a good one
Three properties, in order of importance:
- Grows with the value the customer gets. A customer sending ten times the email should pay more; one whose use hasn’t changed shouldn’t
- Easy to understand and predict. A buyer must be able to estimate next month’s bill
- Doesn’t discourage the behaviour that creates retention. Charging per report run makes customers run fewer reports — and customers who use a product less leave
The tension is between 1 and 2. Usage pricing tracks value best and is hardest to predict. That’s why most sit in between: tiers with usage allowances — Tiered Pricing.
Why it moves revenue so much
Revenue from existing customers grows without any sale when the metric grows with them — expansion revenue.
Worked example. 100 customers each start at £100 a month; a year later the average customer is using 40% more.
START ONE YEAR LATER CHANGE
Flat £100/month £10,000 £10,000 0%
Per usage £10,000 £14,000 +40%
monthly churn 3% on both → lose ~31% of customers over 12 months
flat: £10,000 × 0.69 = £6,900
usage: £10,000 × 0.69 × 1.40 = £9,660
1 − 0.97¹² = 0.306, so ~31% of customers are lost in a year. Under flat pricing, revenue falls with them. Under the usage metric, growth from the customers who stay makes up most of the loss.
Net revenue retention (NRR) is the metric that captures this: revenue this year from last year’s customers ÷ their revenue last year. Above 100%, the existing base grows on its own — Subscription Metrics.
Where it goes wrong
- Metric the customer can game. Per-seat pricing where five people share one login
- Metric that punishes success early. A usage bill that spikes in the customer’s first good month feels like a penalty
- Changing it for existing customers. A value metric change is a price change for everyone at once, and some will pay a lot more — Price Testing
- Choosing by competitor. The right metric follows how your customers get value, which may not be how a competitor’s do — Willingness to Pay
Most relevant to software and services; ecommerce subscriptions usually price per box or per delivery, where the metric is fixed by the product — Subscription Pricing.