# Refill quantity selector on subscription page: +4.7% conversion rate

- Outcome: Won
- Page type: Product page (Ecommerce)
- Elements: Subscriptions & subscribe-and-save, Variant, size & option selectors
- Test run by: [Optimizely](https://liftarchive.com/practitioners/optimizely/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://www.optimizely.com/field-notes/articles/experimentation-use-cases-retail-subscription-page
- Page: https://liftarchive.com/test/optimizely-toothbrush-refill-quantity-selector/

Adding a brush-refill quantity selector to a subscription product page lifted conversion rate by 4.7%. Optimizely ran this test for an oral-care brand that sells brush refills by subscription, and published it as an Optimizely Field Notes use case. Subscription units per transaction also rose.

## Result

**+4.7% conversion rate**

- +4.7% conversion rate.
- Subscription units per transaction rose. The exact figure was not shared.

## Control

The subscription product page offered refills with no choice of quantity.

## Variant

The page added a selector so shoppers could choose how many brush refills to get.

## Why it likely won (our reading)

- Letting shoppers pick a quantity makes the subscription fit their household.
- A choice of quantity can make shoppers feel more in control of a recurring commitment.
- Households with several users can buy enough refills in one subscription.

## Caveats

Vendor-reported and anonymized, with no sample size, duration or confidence level shared.

## How to run this test

- Hypothesis: If we let shoppers choose how many refills come in each subscription, then more will subscribe because the plan fits their needs.
- Primary metric: Subscription conversion rate
- Guardrail: Units per transaction
- Guardrail: Subscription cancellation rate
- Guardrail: Average order value
- Who should test it: Subscription brands selling consumables like refills, filters or blades. If your product is used one unit at a time by one person, the choice may add little.

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Credit: Optimizely ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/optimizely-toothbrush-refill-quantity-selector/).
Usage: Free to use, quote and build on, with credit and a link: name the practitioner or organization that ran the test and link to its LiftArchive page. The results belong to the practitioners who ran and shared them; the summaries and commentary are LiftArchive's.