# One-measurement size finder: +33.1% conversion, not significant

- Outcome: Flat / inconclusive
- Page type: Product page (Ecommerce)
- Elements: Variant, size & option selectors
- Test run by: [Clean Commit](https://liftarchive.com/practitioners/clean-commit/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://cleancommit.io/ab-tests/redesigned-find-your-size-feature/
- Page: https://liftarchive.com/test/cleancommit-redesigned-find-your-size-feature/

Swapping a long 'Find Your Size' tool for a single-measurement size finder raised conversion rate by 33.1% and revenue per visitor by 14.9%, but the result was not statistically significant. Clean Commit ran this test for an anonymized Shopify store and published it in its A/B test library. We count it as inconclusive.

## Result

**+33.1% conversion, not significant**

- Conversion rate: +33.1%. Large, but not statistically significant.
- Orders: +32.3%, in line with the conversion gain.
- Revenue per visitor (the goal metric): +14.9%, with a 72.5% probability of beating the original. That is a weak signal.
- Add-to-cart rate: +8.3%.
- Average order value: -14.6%. This negative move ate much of the revenue gain.

## Control

The product page had a 'Find Your Size' tool with long instructions for shoppers to read before getting a size.

## Variant

A short size finder took one measurement in inches or centimeters, showed the matching size straight away and pre-selected it in the size picker above which it sat. The same finder was added to Buy Now sections across the site.

## Why it likely came out this way (our reading)

- One input and an instant answer removes the reading and guesswork that make shoppers unsure about size.
- Pre-selecting the size cuts a step between finding a size and adding to cart.
- The drop in order value may mean more shoppers bought a single item once sizing felt settled, rather than ordering extra sizes.
- With 20,402 visitors and a 72.5% probability, the lift could still be noise.

## Caveats

20,402 visitors over 21 days, and the goal metric did not reach significance. Average order value fell 14.6%, so revenue gained far less than conversion rate.

## How to run this test

- Hypothesis: If we replace long sizing instructions with a single-measurement finder that pre-selects the size, then revenue per visitor will rise because shoppers settle sizing doubts faster.
- Primary metric: Revenue per visitor
- Guardrail: Average order value
- Guardrail: Return rate for wrong size
- Guardrail: Add-to-cart rate
- Who should test it: Apparel, footwear or gear stores where size is a common reason to hesitate. It matters less if your products fit most people or if size can be guessed from one simple choice.

---

Credit: Clean Commit ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/cleancommit-redesigned-find-your-size-feature/).
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.